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Thong tin khoa hpc c6ng nghp mdCAC GIAI PHAP KY THUAT DAM BAO CONG SUAT KHAI THAC Md S ^ Nfl RUfl DfTT 350.000 TflN QU6N(i NGUY£N KHfll/NflM
Na Rua iron ore mine is one of the mines having great reserves belonging Mineral Corporation At the mine, there are two regions including the North and the South. The North region is the place with main distnbuted reserves of the mine with the overburden thickness of 70m. The mine is close to Cao Bang town, so that there have some public building constructions and residential areas on the mining field.
Therefore, it is necessary to have technical mining solutions for ensunng annual mining capacity and safety for the surrounding building constructions
ThS, DO NGQC Tl/dC KS. BUI DUY NAM KS. VO DiNH TRU'O'NG
Vidn Khoa hgc Cdng nghd Md-Vinacomin
Md s i t Na Rpa Id mdt trong nhung md cd tri> lup'ng I6n cua Ting Cdng ty Khodng sdn. Mo cd hai khu vi/c khu Bde vd khu Nam, trong dd khu B i c Id nai tgp trung tru lup'ng chinh.
Chilu day d i t phu khoang 70m, md nam giap Thanh p h i Cao Bang, dan cu va mpt s6 cdng trinh cdng cdng nam phia tren khai trud'ng md. T u dd, c i n cd cde glal phdp ky thugt dam bao cdng suit md vd an todn eho cde edng trinh xung quanh
Ddc diem mo s i t Na Rua Md sat Na Rga thupc phuang Tan Giang vd mgt phan thude xa Hod Chung, thdnh phd Cao Bing, tinh Cao Bdng, dieu kipn giao thdng vd dipn lud'l qudc gia r i t thugn Ig'i Dan cu tgp trung khd ddng due d' khu Bic. cdn a khu Nam thua han. Mgt dp trung blnh khodng 400-^600 nguai/km^.
Md dup'c bao quanh bd't hai eon sdng Id'n, luu lup'ng nud'c mat vd nud'c ngim ehay vdo md mua mua tuang d i i lan, dde biet khu md cd mat dd dan cu khd cao, ndm k l ngay thanh pho Cao Bang.
TrO" lu'ong qu$ng s i t d p 121 + d p 122 dd dup'c xdc djnh Id 16,7 tridu t i n , vd'i hdm lup'ng TFe Id 59,6%. Didn khai thdc d i u ti§n cua khu Ble n i m sdu dud'i m$t d i t khcdng 70m, qudng khu Nam n i m Id trdn mgt dit. Ddc d i l m phdn b l khii luong dit, qudng dup'c t h l hipn d'hinh 1.
Cdc gidi phdp ky thu$t khai thac
Nhu vdy, vd'i ydu e i u edng suit khgi thde 350.000 t i n qudng nguydn khai/ndm, edc gidi phdp ky thudt dua ra phdi
dam bdo cdc nguydn tic:
- Ddm bdo an todn khai thdc vd hi$u qud kinh t l t i i da cho md;
- Gidm thilu di$n tich din bu gidi phdng mdt bing, su dpng tdi da bdi thdi trong;
- Gidm thilu anh hudng tdi mdi truirng vd ddn cu xung quanh.
T u dd. cdc gidi phdp ky thudt dua ra nhu sau:
1. Bien gi6i khai tririmg Bidn gid'i khai trud'ng khai thde Id thidn dup'c xdc djnh trdn casd':
Hinh 1. Biiu dd phdn bi dit, qu$ng theo chiiu sdu khu Bic
KHCNM SO 1/2013 * CNKT LO THIEN
Thong tin khoa hpc cong nghe m 6
w
- D i e dilm dja hinh, c l u tao dja chit, sg phin b i tai nggydn cOa via trong gidi han khg vgc duo'c giao q u i n ly khai thao;
- K i t qua nghien eCru d l l u kidn dja c h i t cdng trinh theo bio cio;
- He s i bdc gidi han tinh toin (Kgh = 12,0 m'/tin);
- Gdc d i e i n dinh cOa bd md duo'c nghidn cCrg, tinh t o i n trong bang 1.
Bidn gidi v i trO lup'ng khai trudng dup'c tinh t o i n v i Iga chQn tai c i c khu Ble v i Nam dupe t h l hidn d bang 2.
2. Trinh t^rkhai thic dd thii Trdn ca sd d i l g kidn san trang, c i g tao v i d i e tinh eic via qgang, hidn tr^ng khai thic, ke hoach khai t h i e - d i thai cOa md sat N i Rga trong giai doan tdi ( d i t i i da bai thai trong), trinh t g khai t h i c md dupe lua chpn:
* Khai tnrang khu Nam;
Khai thie dong thdi tren t o i n bd khai trudng, trinh tg' phit triin cdng trinh md tCr Bdng - Bac sang T i y - Nam, hudng bdc d i t t d B i c xuong Nam, t d tren xging dudi. Khai tiuiing khu nam dupe t l l n hinh khai thac trong 5 nam, dat d i dupe d i v i o bai thai so 1 va s i 3.
* Khai truang khu Bac;
Trinh t g khai thac dupe chia lam 3 giai doan.
- Giai doan 1 (10 nam dig):
khai thic tren t o i n bd khai trudng khu Bac d i n mdc +90.
Trinh t u phit triin edng trinh md t d trung t i m v l 2 canh, hudng bdc d i t tCr trung tam phit triin v l c i n h Nam v i canh Bac. O l t d i thai dupe d l
Bing 1. Kit qui kiim toin dn dinh bd mi
Birmd Khu Nam
B d T a y : B d phSnq, QKT = 33°+45°, Hu = 100+146m B d Bdnq: B d p h i n q , OKI = 30»+37» Hu = 50+100m Khu Bic
B d Tdy: B d Idi, OKT = 35''+40°, H» = 195+300m B d O d n g : B d Idi, OKI = 30»+37», Hu = 216+255m
Hi sd dn dinh (n)
1,21+1,67 1,20+1,76
1,10+1,38 1,13+1,26 Bdng 2. Cdc chi tidu phirong dn bidn gi&i khai trudng
TT 1 2 3 4 6 6 7
C / l / t i i u
C h i l u ddi trunq blnh C h i l u rdng tmnq blnh Didn tich Khdi I w n q d i t bdc Khdi tupnq qu^nq B C Khdi lupnq qu^nq NK Hd so bdc trunq blnh
Don vi
m m ha m ' t i n t i n m^/tan
Gii tri Khu Bic
1156 836 77,64 76.089.440 10.444.690 10.414.860 7,31
Khu Nam 605 270 14,73 4 871.040 1 458.001 1.460.662 3,36
Toan md
80 960.480 11,902.691 11 865.422 6,82 v i o b i i thii s l 2, 3 va 4.
- Giai doan 2 (tu nam thd 11 d i n nam thu 25): su dgng bd md canh Bic lim bd ddng tam thdi, t i p trung khai thic cinh Nam khu Bac, dua khu vuc n i y v l k i t thue khai thic mCre -70. Be dieu hda khii lupng d i t bdc hing nam eua md khdng bi tang ddt ngpt c i c nam sau, trong q u i trinh khai thic quang d cinh Nam ddng thdi tlln hinh bde dit trudc d khg vgc T i y - Bae canh Bac, chgin bj didn khai thac cho cinh Bac sau nay. B i t d i thai dupe do v i o bai thai s i 4.
- Giai doan 3 (tu nam thd 26 den nam thu 35): t l l n hanh khai thac tai canh Bae khu Bac, do t h i i trong v i o canh Nam khu Bac da k i t thue.
3. H^ thong khai thic Be phiJ hpp vdi dilg kipn dja chit, hidn trang khai tru'dng khu Bac va khu Nam, hp thing
khai thic (HTKT) eho khai trudng md sat Na Rga dupe lua chon la HTKT khiu theo Idp dirng chia bd md thinh nhiiu nhdm ting, trdn mdi nhdm t i n g cd the su dgng khiu duii, van tai dit da dd b i i thai ngoai v i bai thai trong.
4. Ddng bg thiit bf va cac khau cdng nghe
Bdng bd thiet bi khai thic dupe lua chpn dam bao cic yeu c l u :
- Cd tinh CO ddng cao, i p Ige ndn nhd.
- Phd hpp vdi dieu kipn dia hinh v i dia chit cda md.
- Bap dng yeu c l u san Igpng cua md va phCi hpp vdi thdng s i he thing khai thic.
Li/a chon ddng bd thiet bi chinh cOa md nhu sau;
Miy khoan dat da va quang dudng kinh 165mm; Miy xiic dat da E = 4,3m'; xuc quang
liHCNM s o 1/2013 * CNKT LO THIEN
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Thong tin khoa hpc cong nghe m6 nguyen khai E = 2,8m=; dtd v i nt i i cd t i i trpng 36 t i n ; m i y gpt ed cdng suit 168+ 179kW.
5. C i c khiu cdng nghf chinh dirfc tinh toin vi Ifra chtfn nhtr sau:
* Khiu khoan nd min Cie thdng s l khoan n i mIn dupe tinh t o i n phO hpp vdi miy khoan dudng kinh 165mm khoan d i t d i va qging d i lua chpn d bang 3.
* Khiu xuc bdc - Xuc b i c d i t d i theo so' d l edng nghd:
+J<Cie theo phin t i n g dudi mdc miy ddng, d i thii v i o dtd ddng cgng mde hoic dudi mdc miy ddng.
+ Xuc h i n hpp e i trdn v i dudi mde miy dung, d i t h i i v i o dtd ddng mde dudi.
- Xuc quing nguydn khai:
sd dgng dong bp thllt bj m i y xiJc 2,8m' k i t hpp d td t g d i t i i trpng 36 t i n xdc b i c qging nggyen khai theo sc do cdng nghd:
+ Khi M» < 3m thi MXTLGN dung d i i dipn vdi vich via v i xuc gucng xuc phia dudi, chit t i l v i o dtd ddng cCing mdc.
+ Khi 3m < Mn < 15m thi MXTLGN ddng trdn ndc t i n g quang xuc guong xdc phia dudi, chit t i l v i o dtd ddng mdc dudi.
+ Khi Mn> 15m thl MXTLGN ddng ndc hope mde dudi ting quang xuc guong xuc phia dudi (hoic trdn), chit t i l vio dtd ddng cimg mdc (dudi hoic trdn).
* Khau v$n tai
Vdi dac dilm md N i Rga cd chieu s i u khai thic khdng Idn (HmB = 300+31 Om), khii lupng md nhd (qupng 350.000 t i n
Bing 3. Cic thing sd khoan ni min
n
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Chi tiiu Du'dnq kinh Id khoan Chilu cao ting Chilu siu khoan thdm Chilu sdu Id khoan Gdc nqhidnq Id khoan Dgdng cin chdn ting Khoing cdch gida cdc Id Khoing cdch gida cdc hdng Chi tidu thude n i Sd lupng hdng khoan Chidu rdng bloc nd Khdi lu-png thude tronq l i khoan Khii lupng thude Im Id khoan Chilu cao cdt thude Chilu cao cdt bua Suit phd dd
Kf hifu
dk H Ikt Ilk
<">
W a b q n A Q
<I Lt Lb P
Bonvl mm
m m m Stf m m m kg/m' Hdng m kq kg/m
m m m'/m
Gii tri Quing
165 5 1 6 60+90
4 4 3,5 0,55 3 11 44,0
18 2,5 3,6 11,7
Bi 165
10 1.5 11,6 60*90
6 6 5 0,36
3 18 111,5
18 6,2 5,3 27 quang nggydn khai/nim, d i t
bde 2,1+3,3 tridg m'/nim), eung dd v i n t i i d i t d i trung blnh ngin 3,72km, hinh thdc v i n t i i d i t d i v i quing hpp ly l i dtd don thgln. Ding bd thllt b| v i n t i i Ipa chpn: v i n t i i d i t d i v i quing nguydn khai sd dgng dtd t g d i t i i trpng 36 t i n , v i n t i i qging tinh sd dung dtd t i i trpng 15 t i n .
Kit luan
Bi khai thie Id thidn mo s i t N i Rga dpt cdng sgIt thllt k l 350.000 t i n qging nggydn khai/nim o i n thgc hidn t i n g 4hl c i c giai phip kJ thgit trdn diy.
- Bidn gidi khai tnidng dupe thiit k l d i m b i o an t o i n trong q u i trinh khai thic v i t | n thg t i l da t i i nggyin qging s i t N i Rga bing phucng phip Id thien;
- Trinh t g khai thie, d i thai dupe Iga chpn phO hpp d i e
d i l m tdng t h i n quing, dim b i o ra qu$ng nhanh, dpt cdng s u i t thllt k l , t i n dgng t i l da b i i t h i i trong, g l i m didn tich b i i t h i i ngoii t i n g hidg qua kinh t l cho t o i n dif i n ;
- Thi cdng theo dCing cic thdng s i k9 thuit dupe li/a chpn n h i m khai thic hidu qua, an t o i n , g i i m thilu i n h hudng tdi mdi t n j * n g v i d i n cu xung quanh./.
Til lifu tham khio:
1. B i o c i o t h i m dd quing tpi khg vpc N i Rga thgdc phudng T i n Giang - thinh p h i Cao Bing, tinh Cao Bing do L i l n d o i n Dja ehit Ddng B i c l i p n i m 2007.
2. Thllt k l b i n vd thi cing - T i n g dg' t o i n dp i n khai thic Id thidn md s i t N i Rga d|t 350.000 t i n qging nguydn khai/nim do Vi|n Khoa hpc Cdng nghd Md - Vinacomin lip n i m 2012.
3 KHCNM S6 1/2013 • CNKT LO THI^N
