Thong tin khoa hoc cong nghe m o
s u DCING CflC V l C H d N G CO KET CflU D f l C B I E T
CHONG GlUf CAC DlflDNG LO OAO QUA VUNG DAT DA CO AP LUC MO LOM tai Cong ty TNHH MTV 45 - Tdng Cong ty Dong Bic
In general, the geological conditions at Quangnlnh coal basin are very complicated with many fractures and faults, therefore, the execution of the drifts, especially the ones driven through the weak rock area has been very difficult and they have to be retimbered after 3 or 4 months. In this paper, the author refer to the application of the supports having specific structures for supporting the gateway at the level of *225 LC7-7 of Dong Rl coal mine (Dong Bac Corporation) with the length of 21.5m
KS. N 6 N G VI^T HUNG
Vipn Khoa hge Cdng nghp Md - Vinacomin KS. NGUYEN QUANG BJNH
KS. NGUYEN TRAN THANH Ting Cdng ty Ddng Bic
Dilu kipn dja chit md vung than Quang Ninh rit phCpc tgp, phay phd, dCpt gay nhieu ndn mCpc do on djnh eua via than ea theo phu-ang vd theo hu-dng doc thap. Dac bipt, khi cdc via nam g i n mat d i t cdn bj anh hu-dng cua qua trinh boi tich, trdi rCpa, xam thyc, bj nu-de mat xam nhgp gay nen nhu-ng biln doi Idn, cdc Idp da vdeh tru chCpa nhilu khoang chit ed tinh tru-ang nd ndn khi ddo Id qua dd, dLPdng Id chju tdc ddng cua dp lyo md Idn han binh thu-dng, lien tuc mat on djnh, bj phd hdng nhanh chdng va phai chong xen Igi nhilu l l n .
Thyc t l , cd nhu-ng dydng Id ehl sau khi thi cdng 3 - 4 thang da bj nen bpp phai chong xen Igi. Vide ching xdn Igi nhilu l l n , anh hydng khdng nhd tdi van chuyin than va thdng gid. Cdng tac chong xen khdng nhCi-ng ton kem vat ty, vat lieu, nhan cdng ma cdn hgn e h l d i n cdng tac khai thac than.
Md than Oong Ri thupc Cdng ty TNHHMTV 45 - T i n g
Cdng ty Ddng Ble dang trong thdi ky xdy dyng ca ban. Cdc du-dng Id, nhit Id cdo du-dng Id dpc via than, mgc du dang nam trdn mu-c thdng thuy (+
225 m), chilu day Idp d i t phu khdng Idn, nhu-ng ngay ca cdc vi ching thep Idng mo CBFI 22 cung bj phd huy mgnh, mdt s l du-dng Id dpc via khdng t h l su- dung dLpgc. Trong dilu kidn dd. Ting Cdng ty Ddng Bac da hgp tdc vdi Vipn Khoa hoc Cdng nghp Md triln khai cdng trinh nghidn CCPU ching giu- du-dng Id trong d i t da y l u , dp lye Idn nhdm giam ching xen (Quylt djnh s l 3509/QD- DTXD, ngdy 14/10/2010 va Quylt djnh s l 3525/QD - DTXD ngdy 15/10/2010 v l vide phe duydt d l cygng vd ndi dung d l tdi: "Nghien CLPU
lya chpn ede giai phap t i n g t h l 6k ching giu- cdc du-dng Id dao trong da y l u dp lye Idn tgi Cdng ty TNHHMTV 45").
De tai da tiln hanh khao sat, lap thilt k l ban ve thi cdng va dya vao dp dgng tgi Id dpc via than mCpc + 225 LC
7-7 Cdnh Ddng khu II Tuyln IV vdi t i n g chilu ddi Id 21,5m tCp HK 14 d i n HK 35,5 bang vi ching thep khep kin vdi dim n l n dgng hinh cung thdp hinh CBn 27, tilt didn Sa = 11 m^
khoang each giu-a cac vi ching la 0,35m, chen bdng t i m chen be tdng elt thdp due s i n . O i n nay, sau 9 thang thi cdng, ede vi ching bj biln dgng vd chuyin djch khdng dang k l , hidn tu-gng phd huy duy nhit la mdt vdi gdng bj dCpt dCpt da du-gc thay thl, hinh dgng tilt didn dydng Id khdng thay d i i .
Cac k i t qua khao sat tai cac du-dng Id dpc vfa md than D i n g Ri cung nhu- tgi mpt s l dydng Id khac vung than Quang Ninh cho thiy:
- Ap lye md tac ddng Idn vi ching Id dpc v[a than r i t phCpc tgp, hydng tac dpng khdng chF tLP tren ndc ma phg thudc vao tinh chit d i t da vach va trg via, y l u to gdc doc via.
Cac vi chong du-gc tinh toan dya tren k i t qua do dgo dp lye tgi mpt so du-dng Id cd
KHCNM s d 11/2011* XAY DUNG C 6 N G TRINH NG^
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Thong tin khoa hoc cong nghe m o
dilu kipn tu-gng t y eho thiy, dp lye tde dpng tCp phia ndc vd nen cpng hu-dng tde ddng len vi ching rat Idn va dao ddng tu- 30 - 35t/vi, gay pha huy vi chong.
Hdu h i t cac vl chong chdng giu- cae du-dng Id dpc via than, dat da bao quanh via cd dp ben thip, trong vung than da I m u-dt deu khdng du ben de chong Igi tac dpng cua dp lyo md.
D i t da vdeh trg via ehCpa cdc khodng chit cd tinh tru-ang nd nhu- montmolionite hay thgch eao, tgo ndn dp lye tde ddng tu- cdc phia, gay phd huy vi chong Id.
Kit c i u chong ddc Igp khdng huy ddng du-gc sy tu-ang tdc eua dd, khoi da vdi kit eiu ching, do dd chi phi chong Id se rit Idn,
TCP ode nhdn djnh trdn vd qua thyc t l dp dgng cho thay vide su- dgng vl ehong khdp kin ehl tgo tCp thdp hinh CBfl 27 vdi lidn k i t tgo khli giu-a ode vi ehIng ridng bidt vdi nhau du-gc ehe chan bang cac tam chdn BTCT due s i n chen km ede phia theo ydu cau cua thilt k l da giu- cho du-dng Id khdng bj phd hdng.
Moi ngu-di vdn quan nidm rang khi ddo Id dpc via ndn bo tri Id bdm tru, vl khi dd vl chong coi nhu- dgt trdn nen b i n vu-ng vd se on djnh. Thyc t l trong dilu kidn vach vd trg via la ede logi da cd tinh hut nLPdc vd tru-ang nd, thl vide b l tri du-dng Id bdm trg cdng lam cho du-dng Id bj phd huy nhieu han.
Khao sdt mpt so du-dng Id dpc vfa than, nhu- ede Id dpc via 7, via 9 md than Dong Rl cdc hipn tu-gng phd huy du-dng Id do dp lye ndn khdng nhu-ng tCp phia ndc Id (hinh 1) md edn d i y tu- phia nen Id lam cho vi chong bj day tru-gt theo gdc doc via (hinh 2)
Cdc du-dng Id dpc via than tgi md than Dong Rl du-gc thilt k l vd thi cdng theo trinh ty thdng thu-dng, tilt didn cung nhu- k i t eiu ehong Id du-ge lya ehon theo tilt didn mdu.
Do tidu chuan thilt k l It thay ddi hode ehu-a cd dieu kidn nghien CCPU sau v l dilu kidn dja ky thugt md, dieu kipn c i u tgo via vd tinh chit nham thgch nen khdng dap u-ng dilu kien thyc t l .
Ld dpc via mCpc +227LC7-7
ed dilu kidn vach, trg via la cae phan Idp khdng deu, chilu day vach, trg gia tCp 10 - 30em. Day la Idp set va set k i t cd dp ben vdo khoang 10 - 20MPa, phan Idp mdng 3- 5 cm gan k i t vdi nhau bdi cdc mgch phan Idp. Trdn b l mat phan Idp, thu-dng Id cac mdng set lang bdng pha lln than.
Vdi c i u tgo nhu- vgy ndn khi bj I m u-dt hogc ngam nu-dc cdc Idp de bj tdch rdi nhau, mat khac, vdi tinh chat phan ru-a eua set cao khi ggp nu-dc hogc dp I m bao hod ndn Idp set mit kha nang bam dinh lien k i t vdi nhau.
Vach, tru tryc tiep cua via 7 Id bpt k i t day tCp 5 - 10 m, bj phan thdnh cdc Idp mdng.
Quan sat cdc khe nCpt giam y l u c i u true dpe thanh Id va dy bao khe nCrt theo khli t h l tich thiy rang, chf so RQD cua vach trg vfa khdng eao, vdeh vfa thudc logi vach nhp, dd sap do khi lp trin vd phd hoa.
Vdi Idp trg, vdeh gia Id sdt vd sdt k i t ed tinh tru-ang nd cao de gay hidn tu-gng bung n l n , nhu-ng du-dng Id dpc vfa mu-c +225LC7-7 du-gc thiet k l vd thi cdng bam trg, vl chong
Hinh 1. Dw&ng Id bj ndn tii" vdeh Hinh 2. Doan Id bi ndn tir vach vd nen
KHCNM s d 11/2011* XAY DUNG C 6 N G TRINH NGAM VA MO
Thong tin khoa hoc cong nghe m o
Id se phai chju tac dpng cua dp lye trygng nd va dp lye bung n l n tu- phia n l n Id. Cdc met Id chong xen, thay t h l Igi k i t cau ching vd vgt lidu ching tCp vl ching tilt didn dgng vdm mpt tam, tydng thing, chen kich bang t i m chen be tdng elt thep due san (BTCTDS) d i n vl ehong hinh d van khdp kin vdi d i m n l n mpt dogn hinh ednh cung, lien k i t vdi hai ept dgng lien k i t linh hogt vdi chilu ddi phin lien k i t linh hogt 30 cm bdng gdng vd Igp la dgng vai bd.
Thdp gia edng gdng vd deu du-gc thilt k l d l chju lye dCpt dCpt eao han, ndn vgt lipu du-gc chpn Id thep et5 kleh thu-de (|) 22 (j) 24 mm. VI ehong linh hogt cd moi lien k i t chilu dai 30cm eung du-gc thilt k l vd thi cdng bang cae gdng dgng "vai bd", thay eho cae gdng thanh lap la phang.
Cae du-dng Id dpe vfa than, ve nguyen tie, trgc Id ludn chgy song song vdi du-dng phu-gng, nhu-ng do tinh on djnh cua via than theo dLPdng phu-gng khdng eao, nen ed t h l hogc r i t dd xay ra hipn tygng trgc tim Id cheo vdi phu-ang via. VTa 7 hay via 9 trong cdc via than eua md than Ding Rl cd gdc d i e trung binh khoang 20 - 30°, do vgy, dp lye d i y tCp n l n va hai bdn hdng Id thu-dng khdng can bang theo hu-dng tu- vach d i n trg, tCpc la lye d i y hdng tac dpng vdo opt ching khdng tren eung mpt mgt phang. Dp Idch cua hu-dng tdc dgng dp lye phg thudc vao dp Ipeh cua trgc du-dng Id so vdi phygng via. Nhy vay, tac dgng cua dam n l n se bj anh hydng n l u
giu-a cdc vl ching khdng dygc lien kit.
T i m chdn BTCTDS ed vai trd r i t quan trpng, nhit Id trong cdc dydng Id bdm trg, khi cd Idp trg gia m l m y l u vd ed tinh tru-ang nd. T i m chdn vdi tde dgng ehe ehIn vd trdn h i t la phdn b l hu-dng tdc dgng cua dp lye n l n vd dp lye hdng d l eho vl ehIng khdng bj d i y xidn khdi mdt phang vudng gdc vdi trgc Id.
Trong qud trinh thi edng, n l u ode t i m ehdn, nhit la t i m chdn phia n l n Id, khdng dygc chen kin hode khdng ehdn, khi dp lye n l n vd lye d i y hdng tang vl ching se bj d i y xidn, tilt dipn dydng Id bj thay d i i va biln dgng.
Du-dng Id dpc via 7 mCpo +225 da du-ge thi edng. Do dp lye md Idn kem theo dp lye nen eao ndn dogn tCp met thCp 14 du-gc xdn vd ching Igi bang vi ching khdp kin
Dogn Id tCp nK14 d i n nK35 mCpc +225 LC7-7 Id dogn ching xdn, thay k i t c i u ching.
Cdc bu-dc thi edng xdn vd lap dyng vl ehIng theo cae bidn phdp da Igp theo trinh ty sau:
Sau khi thdo dd vi ching, dyng vl ching tgm bing vipc su- dgng d i m edng sgn, gdc xd ndc d l che chin da rai, tiln hdnh b i c xuc dao sau phin n l n Id d i n chilu sau thilt k l . Khi tgo dygc khoang tring dam bao kleh thu-dc dydng Id theo tilt dipn dao (Sa), t i l n hanh dgt t i m chen phia nen. Tren cac t i m chen n l n Id d i m n l n dgng cong hinh cung. T i l p tgc lap dyng cpt chong hai bdn hdng Id. Cpt
ching du-gc lien ket vdi d i m n l n bing cdc gdng dgng vai bd b i t chdt vdi cpt va c l djnh vdi cdc vi ching tryde dd bing cdc thanh gilng vd dygc ching 6& bing cdc edt dgp khi gilng khdng du khoe, giu- cdt thing dCpng. Cdn chlnh d l xd du chilu eao va lien kit vdi hai cdt ching sao cho dam bao kleh thu-dc du-dng Id.
K i t qua cua 6k tai nghien
CCPU tren eho thiy, khi dp dgng vl ching ed k i t o l u dge bipt vdo ede du-dng Id gdp phin nang eao mu-e dp I n djnh vd t u l i thp cua cdng trinh, giam gid thdnh ehi phi ddo ehIng Id, mang Igi hidu qua kinh t l thilt thye./.
Tii lipu tham khio:
1. Quy hogeh phdt triln Ngdnh than giai dogn 2006- 2015, tam nhin d i n nam 2025.
2. Tai lipu "Bdi giang co hpe da" Nguydn Quang Phleh Tru-dng Dgi hpc Md - Dja chat
3. Thilt k l ban ve thi cdng dp dgng cdc giai phap ting t h l d l ching giCJ- cac du-dng Id trong da y l u dp lye md Idn tgi Cdng ty TNHH MTV 45 - T i n g Cdng ty Ddng Bac.
4. Ddnh gia trinh dd edng nghd san xult nganh than theo phyang phdp ATLAST cdng nghd - Vipn KHCN Md nam 2005.
5. Bao cao t i n g k i t d l tdi nghien CLPU lya chpn cae giai phap t i n g hgp 6k chong giu- cac dydng Id trong da y l u , dp lye md Idn tgi Cdng ty TNHH MTV 45 - Tong Cdng ty Odng Bac.
KHCNM s d 11/2011* XAY DUNG C 6 N G TRINH NGAftn 'V/A ilMAy