DIJN PAN KHOA HOC COMG NGHJ
PHI/ONG PHAP X A Y D I J N G BAI TOAN XAC fijNH tfNG SUAT, CHUYEN V!
TRONG MOI TRLTCJNG D A T DA XUNG QUANH CONG TRINH NGAM CO K I T C A U CHONG D d LA KHUNG C H 6 N G
NCS.ThS DAO CONG BINH
T 6 M TAT: Nfii dung bai bao trinh bSy phiMng phSp xay dyng bai to^n xSc i^nh truflng Ong sudt vS chuy&n vj trong m ^ trudng Sk (Ja xung quanh cong trinh ngim co ket cau ching m IS khung ch6ng theo phuong phip hfi so sinh cua GS.TSKIj^
Mo hinh Cd hoc ciia moi tn/8ng kh§o sat i i tfan h6i tuyen tinh v i ci/c ti^u ifng suit tilp chinh (tnfdc diy flU^c gpi l i mfi|
hlnh min O - , x -
Tif khoa: Hk Huy CUdng. plii/ong phap hfso sinti. min T^ vi ctiong, cong ttinh ngim. ;;
ABSTRACT: In this article, the calculation methods was presented to identified in the soil and rock gra\flty stress aW;
displacements distribution of media around the Tunnel excavation with ttie frame corresponding retaining structures.
This paper also introduces a numberical intergration for ttie biaxial state of stress with linear elastic media and main mini-' mum tangential sfress media (fonnerly known as ttie min z,^ media).
1. Oat van de
Trong f^i lieu [2], ta da xac dinh duoc trudng dng su§t trong moi trudng 6k\ da khi khdng xet trong luong ban than ciia khdi dkt da trong edng trinh ng^m. Khdi Qkt da frong cdng trlnh ngam van tdn tai, ehi khdng cd trpng luong nhung vlin ed dd cung Bay gidta se l^y hoan toan khoi dat da nay ra, de tranh sut Id, sup do hoac pha hdng thi ta ckn thay bkng eke ket cau chdng dd, ^p Iyc cua mdi Irudng dat da se tac dung true tiep len kdt c&u chdng dd nay, ta goi dd la twang tac u'ng suit,
Vi cae k§t cku chdng dd va mdi trudng dat da deu cd chuyen vi, tiiy thudc vao dd cimg cua ket cku chdng dd eho nen fren bien edng trinh ngim, ta cd ehuyen vi ciia ket cau chdng dd cung phai bang vOi chuyen vj cua mdi trudng dSf da, ta cd tuang tac chuyen vi.
Giai quyet ddng Ihdi hai bai toan tuang tac u'ng suitvk tuang tac chuyen vj ndi tren mdt each dung dan mdl cd the danh gia duoc tin cay ap luc dat da len cdng trinh ngam Trong ndi dung trinh bay dudi day, tac gia nghien cdu trudng hop ket cau chdng dd la
Khfli tiai chiJa C6ng irinh ngim CFN (mien Q) o " (irong miin Qh)
khung chdng gdm 4 dam khung ed lien ket ngam ho^c lien kdt khdp d nut khung. Md hinh co hpe eua m6i trodng khao sal ta md hinh dan hdi luydn tinh v i mfi hlnh cuc tieu ung suit tiep chinh.
2. Scr dd tinh
Trgn hlnh ve (hinh 1 b) nhu dudi day trinh bay sodS cua bai toan xkc dinh k§l cau chdng dd cdng trlnh nglim la khung chdng (gdm 4 dSm khung dupc ky hi^i laM,,, M^, M;i, Mi2, cd lien k i t ngam hoaccd Ii6nki§t
KhOi dil cliiia COng uinh ngSm CTN (mi6n Q) o (irong mi6i) Qh)
11 iF!>|i j i
i-j"ivi 1 i J
Khung thfing c6 Eto
I » t t
\
j-W-'M't
n2 Eo "1
k "
r^ I
7.
m2 /
„. /
I I I tl 1 So do bai loan xac dtnh trudng ting suit, ctiuyen vt Img mot tniang dit di xung guanh cdng tnnh ngam co ket cau chtng m IA khung chini
NGUdl XAY DONG SO THANG 7 & 8 - 2016
khop a 4 goc, he nay goi la he chtra biit, tren hinh ve (hinh 1a) ia so do oua bai toiSn x i c ainh tnifmg ilng suat af, trong moi tnjang dai da khi khong xet trong tlfig ban than cua kh6i dk da trong cong trlnh ngim ma ta da tinh duoc theo tai iieu [2], he nay goi ia he so satth.
3. Ti/cmg tac i^ng suit
^ Do he tfa biit co cung iuc lac dung ia trong iuong ban than cua moi trucing dJt da, cho nen theo phuong phap he_so sanh cua GS. TSKH Ha Huy Cuong [3], [4]
ta CO Ihe diing iing suit cua Ae da biilts^, - con'goi la he so sanh de tinh ung suat cho he chua biit (a,)
- con goi la A? c i n tin/? ' Nhuvay. d6i vdi mijn cd trong luong ban than cua
khoi flat da - miSn ngoai cong Irinh ngim (miSn - h).
phuong trlnh can bjng cua Ae ttin tinh khi diing phuong phap he so sanh duoc vilt nhu sau.
PHlWNG PHAP XAY DUNG BAI TOAN XAC BINH U'NG SUAT...
dtr^ dz^ dtr' ST'
I ax & ax az prong mijn - h) (1) a r „ ao-, BT' diT°
dz Bx
Trong bieu thuc (1) ft tren, ve trai la hai phuong tnnh xac dinh trang thai ung suit Irong Ae cSn tfnh ve phai la hai phuong trlnh xac dinh trajig thai ijng sua Irong Ae so sanA. vii phai cua bieu thirc tren thoa man phuong trlnh can bjng cho nen v4 trai cilng thoa man phuong trlnh can bjng, day ia hiln nhien mac dau ta cung cd Ihe chijng mmh duoc bjng phep linh bien phan [8].
Bay gid ta se xay dung cac phuong trlnh tuong tac ung suat trong mien khong cd trong iuong ban than cua khoi dat da - mien trong cong trinh ngjm (mien n - i i h ) nhusau;
Khi dua he khung vao d l ching do, ap itrc cua moi Iruong dal da se tac dung truc lilp vao he khung. Tai Vl tn Hep xtic cua cac dam khung vc« moi truang d l l da, ung suat cua moi trudng a l t da theo phuong dimg K) tac dung ien cac dam ngang (M.„ M.j). iing suit cua moi ImOng dat da Iheo phuong ngang (<,•) tac dung ien oac dam dimg (M„, M^,) nhu hlnh 1c
COI moi dam khung chi chiu iuc tac dung thjng dung va truc dam. cho nen Irong miln n h ta cd phuong trlnh can bang iuc dudc v i l l nhu sau'
DOI vol ttim ngang M„ va M^
" • • d = M
r ^ ^ ^ ^ ^ - ^o = 0 (2a)
Ditong™ cong mnl, ngim j j " ^ ° ' - " ° <2''>
^ Sieu Ihuc (2a) va (2b) la phuong trlnh can bjng iuc cua cac d i m ngang ben tren va dim ngang ben dut»
cua khung.
Trong do
o^va c i , ia cac img suit cua moi Irudng d l l da heo phuang dimg va duoc goi ia ngoai luc phan bd
^c dung tren dam ngang ciia khung.
M,,va M.^3. noi iuc momen uon trong cac d i m ngang cua khung.
Ddi vcti (Jim duhg M^, va M^.
dM,, dz' d'M,,
dz"
M.I I (mien Qh) I M.2
I34m diins Cona rrinh n.'ani .^ " n - a , . = 0 (3b) Bleu thilc (3a) va (3b) ia phudng trinh can bjng luc cua cac dam dung ben trai va d i m diing ben phai c i a khung.
Trong do-
o^.va ojs la cac ung suit cua moi truOng d j t da theo phuong ngang va diroc goi la ngoai luc phan bo tac dyng tren d i m dimg cua khung.
M „ va M^ la noi iuc momen u i n trong cac d i m dung cua khung
4.Tu'tfng tac chuyen vj
Xem moi tordng d l l da ban d j u da on dinh nen khong cd chuyen vi, chuyen vi chi xult hien khi khli dat da trong chu vi cong trinh ngim bi m i t trong luong, va trudng img suit gay ra chuyen vi iuc nay ohinh la t n * n g img suit khi xet neng viec ioai bo trong luong ban than khli d i l diS Irong cong Irinh ngam . ky hieu la o;-,
Ta^ se xay dung cac lien he giQa ung suit va chuyen vl de xac dlnh hai chuyen vi la u va w tai m i l diem trong moi truOng d i t da, nhu sau:
Boi v^l tnd hinh moi trir&ng dan hdi tuyin tfnh:
Tir lien he giiia img suit v i chuyen vi tlm duoc bang each sCrdung nguyen iy t h l nang biln dang cuc Ueu, cac phirong trinh can bjng nhuda trinh bay trong tai lieu [1] Vii sir dung phep tinh biln phan, la cd:
' ' , - v . d . = E.E,= E . ^ ,4a) ox
d , - V , o = E e = E — az TU bieu thirc (4a) vc« (4b) 4 tren, ta rut n
( 1 - v . )
-k^
(l-v,,)|_5x 1.2vAax
(4b)
(5a)
^ E„
• " 0 - v . ) E,
- ( = , + = , ) =
Tuong tu, ta cung cd lien he c va chuyen vi nhu dudi day.
PHUONG PHAP XAY DIfNR R i i T n i t i Y i n H I N H IJfNG SUAT...
2 0 + v.)
E, fdu
SM/) fdu_ dw] (6)2(l + v,)l,az Bxj' [dz dx)
, ' , c,+ — ^ ( E , -1-E,) -
Eg 5u v„ [^5u 3w (l + v j [ a x l-2v„lax & .
(l+vj[ l-2v/ ' E„ dw V, ('du dw' (i+vJidz i - 2 v „ t a x ^ a z .
(7a)
(7b)
Mat khac, trudrig ung suit trong he can tinh (CT,J) cung phai thda man trudtig chuyin vj tai mdi diem bat ky trong mdi trudng cho nen ta cd:
{7c)
Cong bieu thuc (7a) vdi (7c), bieu thite (7b) vdi (7d), chuyen ve ta cd:
_l§2__r£!i. _ ^ f^ aw A]
(KvjLax ] - 2 v A ^ V j J " " ' ^ <
(i+vjLaz 1-
Trong bieu thuc (
f du dw^
(8a)
{8b) (8b), v& phai la eae trudng dng suat da biet. v l trai la tn/dng chuyen vi va i>ig suat can tfnh
Tuong to ta cd lien he giua trntrtig dng suat tiep x^
trong he can tfnh vdi trudng chuyen vi cung dupc vilt nha sau:
(9a)
la md dun trool eua dat
Trong dd: *^ ^ T,, , ^
da 2(1+v.)
Nhu vay, de xet chuyen vi, ta se su' dung phuong trinh (5a), (5b) va (6) ndi trin.Ta da b i l l trudng ehuyen vj chi do trudng ung suat {tj-0 gky ra. do dd theo (5a), (5b) va (6), tai mdi diem xet, trudng chuyen vi phai thda man tru'dng img suSt, n i n ta cd:
E, 2 ( l - i - v .
E, 2 ( l + v.
fan )laz fdu )Uz
aw"i
*— =C
dxj awAax j
Cpng bieu thifc (9a) vdi (9b), chuyen v l ta co Eg fdu dvt]
{1^
(9b)
(10) Trong bieu thCrc (10), ve phai 1^ ckc trudng litjn suat da bilt, v l trai la trudng chuyen vi va ung suSt can tinh.
Odi vdi mo hinh moi tnrdng cue tieu ifng suit tiSp chi'nh:
Md hlnh mdi trudng euc tieu ung suit tilp chfnti (tnjdc day dudc goi la md hinh mdi trudng min t^,) IS md hlnh mdi trudng dupc sir dung r i t hieu qu3 va luon bao dam cac Idi giai tin c§y trong e^c tai lieu [51, [6]
m-
Dua tren eac k i t qua neu tren, trong b^i bao n^y, tde gia sir dung md hinh mdi trudng cud tieu iing suit l i l p chinh de x^y dung cac lien he giija tmg suit vi chuyen vi lam co sd nghidn cim trutfrig tmg suit, chuyen yi trong mdi trudng d l l da xung quanh cdng Irinh n g i m , nhir sau:
Toong tu nho each l^m ddi vdi mdi trudng d^n h6i tuyln linh, ta cung sCr dung nguyen ly t h l nang bi^n dang cue tieu, cac phoong trinh can banp nhir da trlnh bay d t^i lieu [1 ] va sir dyng phep linh bien phSn [8] de xky dung ckc phuong trinh vi phan ckn blng cung nhu lien he giUa ung s u i t va chuyen vi cOa mdi trudng nhir trinh b^y dudi 6ky.
Xet md_t phan td phing nhu hinh 2 6 ben, trdn phSn td bieu diln ede thanh p h l n ung suit chinh trdn cSc mat cua phan td. Vdi mdi mat ph4ng b i t ky di qua phan td thi tren mat phing l y ludn cd ung suit tiSp i va tmg s u i l phdp a. Va ta cung se tim dupc mdt mSt phang mk tren dd cd img s u i t t i l p chfnh \dn n h i l x^.
Gia Iri drig suit tiep ehfnh x^^ va ilng suit phdp 6 tren mat phdng nghidng 45° duoc xdc dinh theo cdng thirc sau;
(11)
Trong dd a, va ag la cdc thanh p h l n U'ng s u i t chfnh dupc xdc dinh qua ung suit phdp va dng s u i t tiep
trong he tpa do ^^'^^•OAc thanh phan Ong suit chinh (xoz), nhu sau: tren cdc m§t ciia phSm td NGUdl XAY DUNG SO THANG 7 & 8 - 2016
PHUONG PHAP XAY DUNG BAI TOAN XAC flINH IfMR .Sliir
cliwi^i
2 VI 2 Thay (12) vao (11), la nhan duoc:
(12)
(13)
^^'-ii
..dn - (14)Trong do, n - gic« han miln iiy tich phan, la dien tich m6i trulimg dang xet;
t „ „ - img suit truot Idn n h i l tai diem dang xet G - mo dun trirot cua mdi truemg d j t da;
Thay t „ „ tij phuong Irinh d j u ciia (13) vac (14) bil l o i n the nang bien dang cuc lieu doi vdi md hlnti moi Iruftng cuc lieu ung suit tilp chinh duoc vilt nhu sau;
„ G
dx 2
' 3z [ 5x ^ ^ ^ ' 0
(15a)
(15b) Trong dd a ia dien tfch he c i n tinh.
Bai todn (15) duoc goi la bai toan cuc tn cd rang buoc. Trong^dd bilu Ihiic (15a) bilu diln i h l nang biln oang cuc tieu cua img suat tilp chinh, bleu Ihiic (15b) la cac phuong Irinh c i n bjng.
BJng phucmg phip ihira s i Lagrange, ta vilt phiem ham Lagrange mft rdng chd bai tdan cuc tri co rang bupc ndi lren va sir dung phep linh biln phan d i i vdl phiem him Lagrange mft rong, la se nhin duoc day du 5 phuong trinh vi phin c i n bjng d l xac dinh 5 ham an chua biel nhusau;
+ - ^ = 0 ; — ^ 4 5x dz - Y - 0
' 2 Ic^ 5
2 G '
' Sz
e, (16)Tir lien he giiia img s u i l va chuyen vi trong bleu thdc (16) tren, ta cd;
d , - d , = 2GE^=2G|H , „ ^ )
o , - ( T . = 2 G 8 = 2 G ^ (17b)Cong bilu thifc (17a) vdi (17b) 4 tren, la duoc-
, COng lir bilu thuc (16), ta cd lien he giiia img suit liep T„ va chuyen vi nhir duiM day-
^ Mat khac, ta cd nguyen iy t h l nang biln dang cuc lieu duoc Viet duOi dang sau;
^<J^ _G(dii_ dw\
2 ' " ^ 2 laz^aTJ
(19)Nhu viy, d l xel chuyen vi, la se sir dung 2 phuonq tnnh (18) v i (19) ndi lren,
Ta d i bilt tru&ng chuyen vi chi do trudng img s u i l (oj) gay ra, dd do theo bleu thuc (18) va (19) lai m l i diem xet, trutmg chuyin vi phai thda man trutmg una suat (o^), nhuvay;
(du dw\
\dx azj"
^(du dw\
2 KSL*^)
(20)
(21a) TruOng irng suit c i n tinh (o,,,) cung phii Ihda man truong chuyen vi lai mci diem b i l ky trong mdi Iruftno cho nen theo (19), tacd,
Cj('au dw\
lUz^^r'^" (21")
Cong bieu thiic (21a) v f l (21h), chuyen v l la cd;
'•' (22)
^( du dw
\dz dx
_ Tir phuong phip xay dung bai loan nhutren, ta se xay dung Ijai toin tuong t i c chuyin vi Irong Iruftng hop kel c i u chdng dft cdng trinh ngim la khung chong nhir sau;
Nhu so dd tinh duoc trlnh b i y lren hinh 1, ta nhan thiy npi luc md men udn M Irong d i m khung ty lo vfti ngoai luc (tmg s u i l ciia mdi trudng d l l da t i c dung len dam kiiung) chd nen neu nhu c i n bilt M' la nci luc mo men udn do cr- g i y ra, la od the sir dung k i t q u i tinh noi iuc md men udn M dd o^ gay ra nhu sau.
lV|-'= M - ^ (23)
Tai VI tri tuong tac cua cac d i m khung vi^ mdi Iruong dat d i , trutmg chuyen vi dd truOng ung suit ojgay ra cung phai thoa man Iruftng ung suit a do
dd ta cd; '-'' Tai vl trf dim ngang M„. ta co:
PHUCHUNB.A^Halitinn«
PHUONG PHAP XAY DlTNR RAI i n A N XAC CINH llNG SUAT...
- E „ I dx'
d'w - M , , (24b)
Bieu thdc (24a) va (24b) la phudng trinh lien he giija noi iyc momen udn cua dam ngang M,, va bien dang udn (dp cong cua duPng dan hdi) ciia nd. Trong bieu thuc nay ky kieu Eo, !a md dun dan hdi cua cdc dam khung.
Cdng tuong img hai v l ciia bieu thirc (24a) va (24b), chuyen v l dang bai toan cd ve phai, ta nhan dutit cdc bieu thuc sau:
(25)
" d x ' Tuong tu, ta cd:
Tai vf tri dim ngang M^ ta co:
d'w o.\
-EJ—r = M;^= M , , - ^
• ^ ^ ' ^ i j
{26a)
(26b) Bieu thuc (26a) va (26b) la phuong trinh hen he giua ndi Iyc momen udn cua d i m ngang M^ va biln dang udn (dp cong cua dudng dan hdi) cua nd.
Cdng tuwig img hai ve eiia bieu thifc {26a) va (26b), chuyen v l dang bai toan cd v l phai, ta nhan duoc cdc bieu thirc sau:
MJ \+-
dx'
Tai vj tri dam ddng M^,, ta co:d x ' o,
dx= " (28b)
_ Bieu thdc (28a) va (28b) l i phuong trinh lien he giifa npi iuc momen uin cua d i m dimg M^, va biln dang uon (dd cong cua duftng dan hli) cila nd
Cpng IUdng ung hai v l cua bieu thuc (28a) va (28b), chuyin v l dang bai loan cd v l phai. ta nhin duoc cic bleu thuc sau.
M„ l + - i 2E, dz-
Tai VI tri dim dtJng M^^, ta co:1- , d ' u o - E c J -
dx = = M , , {30b)
Bieu thuc (30a) va {30b) Id phutmg trinh lien h^
giua npi !yc mdmen udn ciia d i m dirng f^^ vk biln dang udn (do cong ciia dudng dan hdi) ciia nd.
Cdng tucmg img hai v l cua bieu thiiC (SOa) v&
(30b), chuyen v l dang bai toan cd v l phai, la nhan duoc ede bieu thirc sau:
M ^ 1 + 2E,.,I d - u . d z '
0 (31)
Nha vay, vdi cac trinh bay nhudlren, ta cd bai to^n long quat xdc djnh trudng i>ig suit va truPng ehuyin v! trong mdi truPng ddt dd xung quanh cdng trinh ngim trong trudng hpp k i t c l u chdng dd cdng trinh ngam la khung chdng, theo phuong phap he so sdnh ciia GS.TSKH Ha Huy Cucmg dooc vilt lai nha sau:
Ddi vdi mo hinh moi trirdng d^n hoi tuyin tilth:
- v ^ a , a , + ( l + v j T ^
(32aj
9o, dl dtj" dl"
a * , A. » (trong O ^ O h ) OX dz 5x oz dl do dl da° ,
dx dz dx Bz ^ ' - — ~ - + o , | = 0 (trongiih)
dx
- ^ + 0 ^ = 0 (trongfih) dx
^ + a „ = 0 (trongnh) dz
d'M^ „
7"^'^.r^ (Irongtih) dz
2E^ r^u V idu ^ \ 1 (i-f V )[ax i-2v lax a, jj
(32b)
fa =a' (ifongO-nh)
I' (trorgflh ) Q l j I G U C I I X A Y DUNG SO THAKG 7 & 8 • 2016
(32C|
PHUONG PHAP XAY DUNG BAI TOAN XAC BINH IfNn SIlJT
o-ol
h i „ = T,^ (trongfj-fih) M . , l i + - j . - 2 E , I ^ . O (trongsa)M„| l + - f . 2 E _ I - ^ . 0 (irongQh)
"7 r ^ E . . ' " ^ " " (trongnii) 1,, J Az'
Trong bleu thiic {32a) neu tren, thira s i Ihii n h i l la me ning bien dang vilt cho moi Iruftng d i n hdi luyln tinh, thira so thir hai la t h l nang biln dang cua d i m chiu udn Viet cho c i c dam ngang ciia khung, thiia s i thU ba la the ning bien dang cua d i m chiu udn vilt chd cac dam dimg cua khung. Trong bilu thuc n i y ky hieu Eo, E „ la mo dun d i n h l i cila mdi trirftng dit' d i va ciia c i c d i m khung; I l i momen quin tinh cua d i m khung.
Bilu Ihiic (32b) trinh bay cac tuong t i c img suit hai phuong tnnh d i u trong bieu thito nay c i c phuong trinh c i n bang ciia c i c dlem treng mdi truOng d i t da tai mien nggai cdng Irinh ngim duoc xac dinh qua img suat cua he so sanh, c i c phuong trinh sau la c i c phuong trinh c i n bing luc ciia cac d i m khung;
Biou Ihiic (32c) Irinh biy c i c tuong t i c chuyin vi ba phuong Irinh d i u la ba phuong tnnh lien he giu^
chuyen vi va ung suit trong mdi Iruftng d i l da xung quanh cdng Irinh ngam, b i n phuong trinh sau la b i n phuong Innh lien he giOa noi luc mdmen udn v i biln dgng uon cua bon d i m khung,
Boi vtii md hinh moi trirdng cifc tieu lintt suit tiep chfnh:
Z(j=min
tfe ar ao" dt" , - — ^ + ^ ( t r o n g n - Q h )
(33a)
\ dx dz d\ dz at,, CO, _ (?r", da"
[ d\ CZ d\ dz ( i r o n g n - n h ) (33b)
d'M , „ dx dx d ' M , „
-d^-<'°
d ' M , „
Kdx dzj
'ydz dxJ • •
" . J ' + ^ -2E I — (trongfjh) (trongnh) (trongnh) (trongnh)
(irongfi.nh)
(trongfi.Qh)
= 0 (trongfili) (33b
M„ 1 + - ^ .2E I ' 0 (IrongQh) (33c)
du
2 E , . ' ^ - I ) (n-ongnh)
2 E „ I — y - O (iTongnh) Trong bleu Ihuc (33a) neu lren, thira s i thd nhit la the nang bien dang vilt chd moi IruOng cuc tieu ung suat Hep chinh. thira so thil hai la t h l ning biln dang cua d i m chiu udn vilt cho cac d i m ngang cua khung, thira so thir ba l i t h l ning biln dang cua d i m chiu udn Viet chd c i c d i m dung cOa khung.
Bilu thiic (33b) trinh b i y c i c tuong tac ung s u i l , hai phuong trinh d i u trong bieu thdc nay cic phuong trinh can bang cua cic diem Irong mdl Iruftng d l l da tai mien ngeai cdng trtnh ngim duoc xic dinh qua cmg suit ciia he so sinh, cic phuong trinh sau la cac phuor^g Irinh c i n bing luc cua c i c d i m khung;
Bieu thuc (33c) Irinh bay cac tuong t i c chuyin vi, ba phuong Irinh d j u la ba phuong trinh lien he giCra chuyen vi va img suat trpng moi Iruftng d i t d i xung quanh cong Irinh ngim, b i n phuong trtnh sau la b i n phuong trinh lien he giua noi luc mdmen u i n v i biln dang udn ciia b i n d i m khung,
5. Ket luan
- Bat tdin tuong tac giua cdng Irinh ngjm va mdi trirftng d i t d i la bai toin phuc tap v i chi cd Ihe chd la ket qua diing d i n khi giai quyet d i n g thft hai b i i tnin tuong tac ling suit va tuong tac chuyen vi. Trong bai bao nay tac gia da x i y dung dUdc d i y du c i c lien he va cac phuong trtnh bao d i m diing tuong lac dng s u i l va luong t i c chuyin v| trong mdi Iruftng d i t da xung quanh cdng trinh ngim cd k i t c j u ching dft l i khung chong, tir dd dua ra phuong phip xiy dung bai loan
PHUONG PHAP XAY OllKR R i i rnaw Y t n niMH IfNG SUAT..., tuong tdc giija cdng trinh ngam cd ket cau chdng d d
la khung chong ven mdi trudng dat da:
- Daa tren ket qua s u thay ddi trudng img suat ban dau trong mdi trudng dat da khi co cdng trinh ngdm da btet (luu y rang khdi dat da trong cdng trinh ngam vdn CO dd cimg. chi mdt trong lapng), tdc gia sir dung phucmg phdp he so sdnh ciia GS.TSKH Ha Huy Cuong de xay dung bai toan xac dinh tnjdng ung suat, ehuydn vi trong moi trudng dat dd khi thay the khoi dat dd trong cdng trinh ngdm bdng cac khung chdng. Md hinh CO hoc cua mdi trudng xem xet la dan hdi t u y l n tinh vd cue tieu img suat tiep chinh;
- C o s d i y thuyet, s o d d linh toan, phuong phap tinh todn daoc trinh bay trong bai bao la diing ddn ve mat CO hoc, chat che v l todn hoc, cd dd chi'nh xac cao va la mdl. Ket qua nay lam c o s d cho viec nghien cdu, tinh toan cac l<lt cdu chdng d d cijng nha cdc ket e l u chju luc khdc trong cdng trinh ngam.U
TAI LIEU THAM KHAO
1 Dao Cong Bmh, Xay dUng mo hmh bat toan phing xac dmh trang that ting suat ban dau trong nen dat do trong IUdng ban than.
Tap chi Xay dong. Bo Xay di/ng, s6 thang 11/2014,
2 Dao Cong Binh, Iran Van Ldi, Xac dmh trang that dng suat IU
nhien trong khdt dat khi co Tunnel Tap chi Ngi/di Xay dimg, sd thing 5 & 6 - 2015.
3. HJ Huy Cirang, DSo Cdng Binh, Mot so phUOng phap bienphSn nSng lUdng thudng diing dexay ddng phudng tnnh can bang trong ca hoc Tap chiXaydi/ng.BdXay dimg, sd thang 7/2015.
4 Ha Huy Cifong (1V/20D5), Phtfling phap nguyen ly cdc tn Gauss. Tap chi Khoa hoc va ky thuat Tri 12-11B
5 Ng6 Thl Thanh Hi/Ong (2011}, Nghten cUu tmh toin Ung suit trong ndn dk cAc c&ng irinh giao thong. Luan an tien si ky thuat. Hoc vien Ky thuat Quan si/
6. Nguyin Minh Khoa (2013), Nghi&n cdu trang thai tfng sukgtSi han trong ndn dk its nhien dudi lac dung cua tai trong nen di/dng i]jp va be phan ap. Luan an tien si ky thuat, Hoc vign Ky thuat Quan su.
7 Oaifilng ^2Q^A), Nghien cuu on dmh ndn dudng dkdSi) IrSn ndn thien nhien. LuSn An tien si ky thuat, Dai hoc Giao thdng V^n tai.
8 Engdn L.E, (1974), Phep tinh bien phan. Nha Xuat bin Khoa hoc va Ky thuat, Ha Noi
Dao Cdng Binh - Master of Civil Engineerin(
and Industry
The Military Technical Academy Mobile: 091 338 1697
Email: [email protected] ^
CAC CHUYEN ot TRAC D|A CAN THIET GIANG
DAY CHO CAO HOC...
(iidp theo trang'llj
17 Xdc dinh khdi iuong d i t dao hay d i p khi san nen cdng trinh theo phuong phap ladi d vudng vdi trong sd ciia cac dinh mdt iudi
18. May toan dac dien tir la dung cu do dac trde dia xay dung cdng trinh cua t h l ky XXI.
Ket luan
1. Toa do la thuoc tinh ichdng gian ciJa trSc dia.
Day la dac diem de phan biet trie dia vdi cac mon hoc khac cua khoa hoc trai dit (nhu dia chit ca dit,..)
2. Vl tri, htnh dang, kich thudc la thuoc tinh Ichdng gian cua_ cong trtnh xay^ dung
3 Trac dja cSn thiet cho xay dung trorig tit ca cac giai doan khio sat. thiit k4. thi cong va st^dtjng cong trinh Trac dia gid vai tro quan trong de dam bao chat lumg cong trtnh xiy dung.
4 TU nam 2000 cong tac trie dia a Viet Nam da duac doi mdi hoan toan theo Quyit dinh s6 83/2000/QO/TTg cua ThtJ tudng chinh phu Td day mot hoat dong trie dta xay dung eong trinh dSu phai tuan theo quyet dmh nay
5 Muc tieu not dung cua trie dia dat cuong khac vol muc tieu noi dung ctJa trie dia casd tvluc tieu, noi
dung ciJa trie dia ca sd (giing day cho nganh trk dia) li do ve ban dd dia hinh. I^uc tieu, noi dung cm trie dia dai cUong (giang day cho nginh xay dt/ng) a do dac xay dung cong trinh.
6. Sinh vien dai hoc nganh xay dung cdng trinh hge mon trie dia dai cu&ng mdi chi duw trang bi nhOhg kiin thub co ban nhit vi trie dia mi thoi. Hqc vi&n cao hoe nganh xiy dung cong tnnh ein phai duac hoc bo sung nhOng chuyen di trie dia ke trdn. Bay li nhdng kiin thdc trie dfa thoa man c^c yeu du v^
thupc tinh khong gian cua cong tinh xay dung, rit thiet thyc danh cho cac hpc vien cao hoc ngdnti xay dyng cong trinh. Tai vi moi sai lam co lien quan din thuoe tinh khong gian ctJa cdng trinh (vi tri hlnh dang, kich thude ctJa cong trinh) ddu iam cho xa h^i ganh chju nhOng ton thit rit nang ne. Mpf khi ngudi can bd ky thuat xay dung nim vimg nhung vin rfi dt^c bo sung noi tren thi nhit dinh se gop phan dim bao va ning cao duirc ehit luong cie cong trinh xiy dt/hg.Q
TAI ueu THAM KHAO:
1 Trk dia cdng tnnh - Cfiu bien Za - ca - toov Matxcdva 1967.
2 Oo dae xay dUng cbng trmh - PGS TS Pfiam Van Chuyfin NXB Xay difng HS Ndi 2014.
3 Quydt dinh cua Thu IUdng Chmh phu sU dung hS guy chik vi he toa do gudc gta Viet Nam, ngay 12 IhSng 7 nam 2000 Quylt dlnh sd 83/2000/OO/TTg
4 Thong tUhUdng dan ip dung he quy chidu va he toa dd qu6c gm VN-2000 cua Tong cuc Oia chmh, ngay 20 mSng 6 nSm 2001 si 973/2001/ng-TCeC
N G U d l X A Y DLTNG S 6 T H A N G 7 & 8 - 2 0 1 6
.... A
