w Thong tin khoa hoc cong nghe m o
NGHIEN c i r u DV BAO GOC DOC ON D|NH c h o c a c bci m o - Mo d o n g Sin Quy^n
Sin Quyen copper mine has been exploited since 2002 and to the end of the year of 2011, the lowest level of its bottom at the Eastern region Is *50, the slope failures have happened at some areas, causing difficulties and impacts on the mining efficiency. For increasing the mining safety and efficiency at Sin Quyen copper mine, it Is necessary to calculate and determine the slope angle at Sin Quyen copper mine
ThS. Liru VAN THyc
KS. L t XUAN THU
KS. NGUYEN VAN DUG
Vign Khoa hgc Cdng nghi • Vinacomin
1. Hi$n trgng thiit ki vi khai thic md ding Sin Quyin.
T l hyp ding Sin Quyln, (Ldo Cai) duyc Ting Vidn nghidn eiru thilt k l cdng trinh kim lopi mdu Trung Quic thilt k l vdi san luyng md 1,1-1,2 tridu t i n qudng nguydn khai/ndm. Ddy md khu Ddng kit thiie d mire -80m, khu Tay +64m. Dy dn ndy duyc Ting Cdng ty Khodng san - Vinacomin d i u tu khai thac tir nam 2003.
Tir ndm 2003 d i n nay, Cdnq ty Md - Tuyln d i n g Sin Quyen da tiln hdnh khai thac theo thilt k l duyc phd duydt.
Qud trinh khai thde duyc thyc
hidn ding thdi tpi 2 khu vyc Id khu Ddng vd khu Tdy. D i n k i t thiic ndm 2010 khai trudng khu Ddng ddy md d mirc +50m, khu Tdy d mirc +73 (hinh 1).
Trong thdi gian qua, do chu y l u Id tiln hdnh bdc d i t dd xdy dyng co ban (XDCB) vd mdi dua khu Ddng vdo khai thde tir ndm 2006 cho ndn cae thdng s l eua hp thdng khai thde (HTKT) vd so d l cdng nghd chua duyc hodn thidn.
Nhin chung, cdc khai trudng dd da vd dang duyc thyc hipn theo HTKT ngang vdi cdc thdng s l CO ban Id:
•Chilu cao ting dit dd: 12m.
*Chilu cao ting qudng: 12m.
• Chilu rOng mdt t i n g cdng tdc t i i thilu: 30m.
* Chilu rOng mdt ting dirng tpm thdi: 20m.
Hidn nay. T i n g Cdng ty Khodng san - Vinacomin dang phii hyp vdi Vidn KHCN Md Vinacomin t i l n hdnh dilu chfnh d y dn md rdng nang edng s u i t md d i n g Sin Quyln dpt san luong 2,5 tipu tin qu|ng nguyen khai/nam. Ody md khu Odng d y kiln kit thiic d mCre -152m. Nhu vdy, bd md khi k i t thue cd chilu cao Idn nhlt tir 300 + 400 mdt.
Trong thilt k l do Ting Vipn Nghidn cuu Thilt k l Cdng trinh Kim lopi mdu Tmng Quic da thyc hipn, gdc d i e kit thuc eua
v^ - ^ .
j^^v
a) Khu ddng b) Khu tdy
Hinh 1. Khai trw&ng khai thic kit thic md ding Sin Quyin nim 2010.
KHCNM S6 1/2012* CNKT LO THifeN
w Thong tm khoa hoc cong nghe md
bd md duyc lya chon theo kinh nghipm vd tinh todn so bO Id aKt=43°
Tuy nhien, hipn nay tpi khu Tay bd md dang bj tnryt Id gay mit an todn vd anh hudng din qud trinh md rOng vd khai thac xuong sdu cua md. Theo dy dn md rOng ddy md khu Ddng kit thue d mire -152m, khi dd bd mo ed ehilu eao d i n 400m, vdi bd md cd ehilu cao Idn ehf eIn thay d i i gde die eua bd 1 dO se tang hole giam hdng ehgc tridu m^ d i t da bdc, dilu ndy anh hudng tn,re tilp d i n hipu qua khai thae. Do vpy, 6k khai thde an toan vd hipu qua md ding Sin Quyln din k i t thiic theo dy an md rOng eIn tiln hdnh nghidn eiru todn dipn cdc y l u to ty nhidn vd edng nghp anh hudng d i n on djnh, 6k tinh todn xdc dinh gdc d i e on djnh gidi hpn eho tirng khu vyc bd mo theo trinh tu khai thde xuong sdu hdng ndm eua md mpt edeh hyp ly.
2- Die diem cau t§io dia chit cua khu md.
Mo dong Sin Quyln Id mOt phan ddi quang Sin Quyen, cae thdn qupng cd nguIn g l c nhipt djch bj khlng c h l bdi dirt gay nghjch Sin Quyln d phia Odng bac.
Khoang sang ding Sin Quyln bao gIm cdc thanh tpo trim tich biln chit, dpc bipt Id da biln chit trao doi cd chira khoang hda dong. Hinh dpng thi nam cua cac t h i dja chit trong khodng sdng d i u bj chi phii manh bdi dirt gay nghjch Sin Quyln nam d phia Ddng bac ciia khoang sang.
Ope dilm cau trCie, kiln tao ehung cua khoang sang ding Sin Quyen duyc the
AinlT iBiiMnum nfv*M vm
Hinh 2. Mdt eit dja chit ede tuyen XIII, VI md dong Sin Quyen Bdng 1. Ddc trwng tinh ehit ealy cua dd md ding Sin Quyen.
Vjtri liy mau
Khu Tdy
Khu Ddng
Lo^i dd
Gnaibiotit bj migmatit hda Granitognai Horblendit Thdn qudng Pecmatit Granit Gnaibiotit bj migmatit hoa Horblendit Granitognai Thdn qudng
Khii Iwang the
tich T/m^
2,62 2,6 2,91 3,02 2,57 2,59 2,63 2,78 2,61 2,74
Cw&ng dg khdng ndn MPa
121,1 151,2 135,4 118,1 118,6 184,3 107,0 113,1 101,8 125,3
He so do ewngf
12 15 14 12 12 18 11 11 10 13 hipn trdn mpt cdt dja chit dpe
tnmg cdc tuyln XIII khu Ddng va VI khu Tdy (hinh 2).
D i t dd ehu ylu 10 ra trong phpm vi md ding Sin Quyln Id ting phu hd Dp tii', dd gnaibiotit bj migmatit hda, dd phiin thpeh anh xerixit, dd granitognai, dd biln chit trao dii, horiDlendit vd dd pecmatit granit. Chilu day Idp phu Id 3-5m, dd gnaibiotit bj migmatit hda la dd vdy quanh chu ylu cua thdn qupng. Dd gnaibiotit bj migmatit hda nam d ben phln ria than qupng vd trong than qupng, da vo vgn.
khdng on (Snh. Dd ddc xit edeh xa dd gnaibiotit bj migmatit hda eiia thdn qupng khd on c^nh. Dd granitognai phdn b l phan ria than qupng hope giira thdn qupng, d phan Ddng Nam dd vd vgn, phln Tdy bac dd ddc xit, ran chac, ehilu ddy ddi dd biln chat trao doi ehira qupng thay doi tir 0,5-100m, dd glc on djnh, dd hortDlendit chilm ty Id tuong dii nhd, dd dpe xit, khd rdn chac. Tinh chit eo ly dae trung eua eac lopi dd ed mat trong (Ja ting duyc tong hyp trong bang 1.
KHCNM S6 1/2012* CNKT LO THifiN
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T h o n g tin k h o a h o c c o n g n g h e m o Dy bio gdc doc ondjnh b& md md ding Sin quyin.
Md hinh tinh I n djnh cdc bd md khodng sdng ding Sin Quyln duyc lya ehpn dya trdn cdc eo sd sau:
Cde Idp dd c l u tpo bd md cdm don nghidng vdi gde d i e 70-85° Bd md cdt qua ede Idp dd ed thdnh phln thpeh hpe, mire dO nirt ne vd dO b i n
chira nudc eua d i t dd, dO tin cdy cua cdc thI nghidm xdc djnh tinh chit eo ly, thdi gian t i n tpi cua md trdn 20 ndm cho phdp lya chpn ede thdng s l dua vdo tinh I n djnh nhu sau:
* Hd s l dy trir dua vdo tinh I n djnh n = 1,3
* Cao trinh nudc ngim Idn nhlt d mire+100.
* Cdc thdng s l b i n tfnh todn (bdng 2):
4. Kit lu$n
Tren co sd c l u true dja chit, ddc dilm dja chit edna trinh vd tinh chit b i n cua ddt dd duyc xdc djnh qua cac giai dopn thdm dd duyc tiln hdnh tpi md ding Sin Quyln eho phdp lya chpn so bO cdc thong s l tinh todn, dy bdo gdc die In dinh cho bd md. Ket qua tinh todn vdi bd cd kit c l u dpng ili, gdc d i e kit thiie bd md y = 35°
dam bao I n (I^nh. Kit qua tinh Bdng 2. Mgt si chl tidu ca ly cic lo^l nham th^eh md ding Sin Quyin
Lo^i dd Ldp phu dd tu Od ting phong hda Od glc
Trgng Iwgng thi tich (T/n?)
1,62 2,25 2,75
Luc dinh kit (T/m')
2,2 42,58 70,96
Gdc ma sit trong (dg)
17 26,67 28,00
Ty 1^ phdn bo C/o)
5 15 80 Bing 3
Khu vuc khai trw&ng Khu Odng Khu Tdy
Khu vuc b&
md Bd Tdy nam Bd Odng bde Bd Tdy nam Bd Odng bde
Cao trinh diy kit thue (m)
-152 -152 +52^136^
+52 + 136
D^ng b&
kit thue B d l l i B d l l i Bd i l i Bd phdng
Chiiu eao b&
kit thuc (m) 302-390 262-292 ' 1 7 5 - 2 3 4 80-139
Gdc die b&kit thuc (dg)
35 35 35 40
Hi so on djnh 1.15^1.25 1,22^1.29 1,23+1,35 1,45^1,57 khde nhau. Trong dja t i n g
khdng ton tpi ede mdt y l u t y nhidn. Chilu eao bd md thay doi tir 200+390m. Nudc ngim tdng trir trong bd md dudi dpng thuy tmh khdng dp, cao trinh mire nude ngim giam d i n ciing qud trinh khai thde xulng sdu eua md.
Vdi ede tinh chit trdn theo ly thuyit cdn blng gidi hpn eho phdp lya ehpn md hinh tinh on djnh cd dpng cung trg trdn md rOng, mdt truyt cd dpng cong d i u , dO I n djnh eiia bd md duyc dam bao khi h d s l I n djnh n > 1.
Lya chpn cdc thdng s l tinh I n djnh: Cdn cir vdo tinh chit bin eua d i t dd c l u tpo bd md, mire dO nirt ne, thanh phln thpeh hpc, tinh chit
Vdi so d l vd cdc thdng s l tinh todn dd duyc lya chpn k i t qua tinh todn I n djnh vdi k i t c l u cua bd theo dpng i l i phdn dopn. Trong t i n g phu dd tir gde d i e cua bd a = 30°, trong ting dd phong hod a = 35°, trong dd g l c a =45° Khi dd gde d i e k i t thuc chung cua bd theo dpng bd phlng a = 35°, K i t qua tinh toan theo cdc mdt cdt ddc trung thuOc khu Odng vd khu Tdy md d i n g Sin Quyln vdi ddy md k i t thuc khu Odng d muc -152m, khu Tdy d mi>c +52m duyc t i n g hyp trong bang 3.
Cdc k i t qua tinh todn d bang 2 cho thly, hi s l I n djnh cua cdc bd n= 1,15 + 1,57; bd md dam bao I n djnh d i n eao trinh k i t thuc mirc-152.
todn Id s l lipu tham khao trong qua trinh dilu chfnh bidn gidi k i t thiic md./.
Tii li^u tham khio:
1. Bio do dja chit kit qui thim ddtymymd ding Sin Quyin Bit Xit- Lio Cai. Tdng c(x; £)«a chit Hi Ndi. Nim 1964.
2. Du in diu tu khai thde md ddng Sin Quyin.Ting Cdng ty Khoing Sin. Hi Ndi Ndm 2002.
3. Du in cii tpo vi md ring khai thic md ddng Sin Quyin.
Viin KHCN Md. Hi Nil. Nam 2011.
4. Li Xuin Thu - Hu&ng din nghiin cuu 6n anh bd md li thiin Viin KHCN Md. Hi n|;.
Nim 1992.
5. Quy tic dam bio on dinh bd md IQ thien. Vipn VNIMI (LB Nga). 1998.
KHCNM sO 1/2012* CNKT L 6 THifeN