NGHIEN CUU ANH HUDNG QUA LAI TRONG KHAI THAC HdN HOP HAM LO - LO THiiN TAI M O T SO M 6 THAN VUNG QUANG NINH
For meeting the rapidly increasing coal demands for our economic development, Vinacomin has set up the strategy in enlarging and increasing the mining capacity of the existing coal mines and in Investing in the construction of new coal mines.
Recently, Institute of Mining Science and Technology has carried out many research works for determining the coal reserves beyond the open pit mining boundary but ean be exploited by underground method, determining the mutual impacts in open pit and underground co-mining activities under the geological conditions in Quang Ninh coal basin to propose the reasonable open pit
•underground eo- mining flowsheet.
TS. N G U Y I N A N H TUAN TS. DAO H 6 N G QUANG
TS. Le DLfC NGUY§N
Viin Khoa hge Cdng nghi Md - Vinacomin
Nham ddp Crng nhu c l u than eho kinh t l quoc dan, theo k l hoaeh, san lupng than se tdng nhanh tCr 47,5 tripu t i n nam 2010 Idn 64,7 tripu t i n ndm 2015, dpt 74,6 tripu t i n nam 2020 vd trdn 80 tripu tan vdo nam 2025. O l thye hidn dupe mgc tidu dd.
Tap dodn Cdng nghipp Than - Khodng san Viet Nam (Vinacomin) ed k l hoaeh t r i l n khai m d rOng ndng cdng s u i t ede md cu, d i u t u xdy d y n g cde md mdi. T r u d c tinh trang khai thde 10 thidn ngdy cdng xuIng sdu, hd s l bdc d i t dd ngdy edng tang, vipe xem xdt kha nang huy dOng vdo khai thde sdm bang phuong phdp h i m Id phan trip lupng than nam tai ria vd ddy moong 10 thidn Id h i t su'c c i n thilt.
Xuat phdt tu' djnh h u d n g dd, trong thdi gian qua, Vipn Khoa hpc Cdng nghd Md - Vinacomin da thuc hien hang loat nghien cu-u ed lidn quan nham: i) ddnh gid xdc dJnh phan trQ- lupng nam ngodi gidi han khai trudng 10 thidn nhung ndm trong vung anh
hudng eua khai thde 10 thidn vd ed t h i khai thde bdng phuong phdp h i m Id; ii) nghidn eCru nhQ'ng y l u t l anh hudng qua lai khi dp dgng so do khai thde hdn hpp h i m Id - 10 thidn trong d i l u kipn dja c h i t md vung than Quang Ninh; vd iii) d l x u l t so do edng nghd khai thde hon hpp h i m Id 10 thidn hpp ly nhdm huy dOng sdm p h l n trQ' lupng nay vdo khai thde trong thdi gian tdi.
140,0
120,0 i
^ . ^
51,0
3«,2
o l ddnh gid tong hpp phan trCp lupng than ndm ngodi ranh gidi khai trudng 10 thidn, nhung nam trong vung anh hudng eua khai thde 10 thidn bang phuong phdp h i m Id, ede nghidn eCru eua Vipn da tap trung ddnh gid hipn trpng khai thde vd kha ndng m d rOng toi da bidn gidi khai trudng eua mOt s l md 10 thidn Idn trdn eo s d Q u y l t dinh s l 1122/QO-HOQT ngdy 16
::' Trii luoiig trang ranli gioi khai ihac 10 ihi^n Trit litoiia hu\ dOna liiai ihac him 16
58,4
.24,2
Klie Cham
IV Deo Nai
Xui Beo
Hinh 1. Tuomg quan trOlugmg huy dgng vio khai thic ham Id -16 thiin tai mgt sd khoing sing than
KHCNM s d 1/2012-* CNKT HAM LO
w Thdng tin khoa hpc cdng nghe m d
thdng 05 nam 2008 cua HOi dong Thanh vidn (HDTV) Vinacomin, theo hudng ndng cao hp s l bdc gidi hpn, ndng cao t i i da ndng lyc khai thde, phii hpp vdi quy hopch d l thai, v^n tai, thodt nude vd bao vp mdi trudng. Kit qua ddnh gid cho thly, phln tru- lupng than ndm dudi ddy moong vd trdn bd ting ngodi bidn gidi khai trudng tpi cdc md 10 thidn khoang 293,5 tridu t i n trong ting s l 528,7 tridu t i n ddnh gid, chilm 55,5%
ting tru- lupng dja chit edn Ipi 6ugc giao eho ede md (hinh 1). Do dd, d l ddp Crng nhu c l u tdng san lupng trong cde ndm tdi, eIn nghien eCru vd xem xdt ede giai phdp khai thde hpp ly nhdm tpn thu t i i da nguon tdi nguyen ndy dam bao an todn vd hidu qua.
Kinh nghipm khai thde hdn hpp ham Id -10 thidn trdn t h i gidi da eho thly, ed 3 ylu t l anh hudng chinh khi dp dgng so d l khai thde hdn hpp him Id - 10 thidn, gom: anh hudng cua chin dOng no min 10 thidn din cde edng trinh him Id; anh hudng djeh dOng dit dd md do khai thde him Id din dO on djnh bd
moong 10 thidn; vd anh hu'dng eua nude trong moong 10 thidn vd bdi thai dit dd bdn trdn din
khai thde him Id phia dudi.
Hinh 2. Do chan dgng bang thiet bi Blastmate III
Trong dieu kipn khai thac h l n hpp h i m Id 10 thidn, vide n l min trdn khai trudng 10 thidn ed t h i anh hudng d i n cdc cdng trinh h i m Id phia dudi hay ria moong 10 thidn.
Khi n l min trdn md 10 thidn, ngodi ndng lupng sinh ra 6k phd vd d i t dd vd gdy nCrt tdch edn tpo ra sdng chin dOng lan truyin trong mdi trudng d i t dd, tuy thuOc vdo cudng dO cd t h i gdy ndn nhQ'ng thidt hpi khdc nhau eho cdc edng trinh ddn sinh, edng nghidp trong phpm vi anh hudng eua vg n l . Anh hudng ndy Idm tdng cudng dO phdt triln khe nCrt d i n dudng Id, tdng tai trpng ndc Id khai thde, gdy ra cdc hu hpi nhu tgt \&, bong trdc dudng Id khai thde, tdng dO xult nudc qua cde khe nCrt vdo dudng Id. Kit qua nghidn
cuu ly thuyet cho thly, mirc dO anh hudng cua sdng chin dOng do n l min phg thuOe ehu y l u bdi cdc y l u t l : quy md vy n l , khoang cdch tir cdng trinh h i m Id d i n tdm vg n l , vd ddc tinh eo ly d i t da md (tic do ehuyin am trong d i t da, hi s6 biln dpng, hd s l Poatson
v.v.). Ngoai nghidn eCru ly thuyit, Vidn cQng da tiln hdnh do dae thyc nghidm muc do chin dOng tir cac vg n l min lp thidn d mOt s l md nhu Nui Beo. Khdnh Hda blng thilt bj do chin dOng dja chin Blastmate III (hinh 2). Kit qua do sdng chin dOng dupe ting hpp trong bang 1.
K i t qua do dpc sdng chin dOng tpi cdc md trdn cho thly, mCpc dO c h i n dOng do n l min ty Id thudn vdi quy md eua vu n l vd ty Id nghjch vdi khoang
Bdng 1. Ket qud do inh hwdng chin d^ng tr§n md than ig thiin bing thiit bj Blasmate III Ten md
Mo than Nui Bdo
Mo than Khdnh H6a
ThUty bai no Bdi 1 Bdi 2 Bdi 3 Bdi 4 Bdi 5 Bdi 6 Bdil Bdi 2
Quy md vy no, kg 406 412 410 328 367 1 387 806 3460
Khoing cich den
diim do 335 313 289 276
\ 321 456 250 150
Tran (theo phuxyng lan truyin ngang)
mm/s 1,27 0,889
2,54 2,57 1,40 0.254
4,32 13,5
Vert (theo phuxyng lan truyin dung)
mm/s 0,508 0,635 3,81 4,44 0,635
0,254 ^ 5,84
12,4
Long (theo phuxyng lan truyen dgc),
mm/s 0,635 0,762 5,59 3.56
0,889 ~^
0,127
5,84 ] 8,89
Tdcdd dao ddng tong hgp, mm/s
1,35 1,04 __
5,93 4,98 r 1,54
0,31 _ u__6,58
14,3 _
KHCNM s d 1/2012* CNKT HAM LO
chin dOng do dupe Idn nhat Id 5,93mm/s tuong ung vdi quy mo vu no khoang 410kg va khoang edeh tip tdm vu no tdi vj tri do khoang 289m. Khi khoang edeh cdng xa (456m) vd quy md vu n l nhd (387kg) thi toe dO chin dOng r i t nhd, khoang 0,31 mm/s. Tpi md Khdnh Hda, t i e dO chin dOng Idn nhlt bang 14,3mm/s khi quy md vg n l Id 3460 kg vd khoang edeh tir tdm bdi n l d i n dilm do khoang 150m. Cdn cu theo Quy chuin QC 02: 2008 BCT thi sdng chin dOng do no min tai cdc md dupe nghidn
CCPU dam bao an todn d i i vdi edng trinh ham Id d dilm do.
Trdn eo sd nhCrng kit qua do dpe ndu trdn, kit hpp vdi ede nghidn eCru ly thuyit da dpt dLPpe, Vidn da thdnh lap bilu do xdc dinh khoang cdch an todn tu' tmng tdm vu no din cdng trinh him Id, dya trdn cac thdng s l diu vdo nhu khii lupng thuoc no, toe dO tmyIn am trong dat dd, he s l Poatson, vd hd so biln dpng ddn hoi (hinh 3).
Nghidn CCPU cua Vidn cQng da ehi ra rang, thdi gian vi sai hop ly se Idm giam chan dOng no min 10 thidn.
Nghidn eCru anh hudng djeh dOng do khai thde h i m Id phia dudi d i n dO on djnh eua bd moong 10 thidn dupe Vidn Khoa hpe Cdng nghd Md thye hidn theo ba hudng chinh:
nghidn CCPU ly thuyit, nghidn CU'U trong phdng thi nghipm vd quan trac ngodi thue t l .
Nghidn eCru ly thuyit dua trdn phdn tich ede tdi lipu hipn ed trong nudc va trdn t h i gidi 6k xdc djnh vung anh hudng djch dOng va quy luat djch ehuyin, biln dpng bd md 10
Chl^u qAy try bi p v^ d i ^i 6Ay n A 1^ thl< n. m 100 0 B7 5 75,0 62 5 50 0 37 5 25 0 Trong IruOng I (V6I E. < 0.0001)
37 5 60 5 51.5 42 0 34 0
rrong IriA^ng II (V6I E. < 0,0002) 25.0 17.0 8 5 54 5 47 5 40 0 33 5 27 5 20.0
Trong Irudng III (V6I E. < 0 0003)
2000 4000 6000 8000 Kh6l tuong Ihutfc nrf, Kg
Hinh 3. Bieu do xdc djnh khodng edeh an todn den tam vy no min 1^ thien
C I C
Hinh 4. So do xdc djnh ving dnh huvng eua khai thde hon hgp Id thien - ham Id
thidn trong so do khai thde Nghidn cu-u quy ludt djeh hdn hpp ham Id -10 thidn. Cde ehuyin vd biln dpng bd ludn dilm ly thuyit hidn ed dd moong 10 thidn eho thly, khi ehi ra rdng: i) bidn gidi vung khai thde ham Id phia dudi anh hudng djch dOng khi khai
thde hdn hpp him Id 10 thidn duqtc xdc djnh bang miln hpp eua vung anh hudng do khai thde 10 thidn vd vung anh hudng do khai thde him Id (hinh 4); vd ii) dO sdu an todn khai thde him Id dudi ddy khai tardng 10 thidn phg thuOc vdo chilu ddy khlu than vd kieh thude guong khai thde Id ehp.
Nhu vay, khi khai tardng 10 thidn nam ngodi gidi hpn bin
moong 10 thidn, anh hudng djeh dOng ed t h i Idm tdng gde doe bd moong 10 thidn, vd giam cde gidi hpn dO cu-ng eua khoi d i t dd trong bd moong 10 thidn (hinh 5). Hdu qua Id lam suy giam ede lye kdo giQ- trong mat giam y l u , ddn d i n sy suy giam dO kidn CO bd md 10 thidn, gay mit on djnh bd moong, bd ting. MCPC
dO suy giam dO kidn co bd moong 10 thidn phg thuOc vdo djch chuyen do khai thde him cde y l u to: cudng dO phd huy Id, hope khi khai thde ham Id d c l u true khii ddt dd; tuong dO sdu du Idn, thi khai tardng quan giQ'a ^gdc nghidng eua md 10 thidn vd md him Id cd the mat giam y l u vd khu vyc khai 6uQtc coi nhu khdng anh hudng
djch dOng qua lai ldn nhau.
thde ham Id; dO eCrng ban dau eua khoi dat dd; giai dopn
KHCNM s d 1/2012* CNKT HAM LO
w
Thdng tin khoa hpc cdng nghe mdHinh 5. So do dich chuyen vd bien dang dat da t>d' moong Ig thien do khai thde ham 16 du-&i
Hinh 6. Md hinh so md phdng khai thac hon hgp ham Id - Id thien
Hinh 7. Nghien cdu quy luat dich chuyen va bien dang dat da tren md hinh vat lieu tuxyng duxyng
phdt triln eua vung djch cQng anh hudng din mCpc dO ehuyin; quy md vd tic dO khai biln dang bd moong 10 thidn.
thde him Id. Nghidn cu'u cung Ben canh nghidn CLPU ly cho thly, trinh ty khai thde vd thuyit, ViOn da tiln hanh xdy hudng tiln guong Id chp dyng md hmh s l hda 6k lam
rd anh hudng cua dilu ki^n ky thudt md cQng nhu cdc thdng s l cua so d l cdng ngh?
khai thde him Id din quy lugt vd mCre dO djch ehuyin, bien dpng dit dd bd moong lp thidn. Md hinh 6ugc xdy dyng trdn phln mim PHASE2 do hdng Rocscience cua Canada san xult, theo phuong phap phln tLP hCpu hpn vd cdc ly thuyit v l phd huy dit dd mo cua Hoek-Brown. Md hinh so hda md phdng khai thde hon hop him Id 10 thidn trong dilu kidn dja chit ky thudt mo Khe Chdm ll-IV (hinh 6). Kit qua phdn tich trdn md hinh s6 dd cho thly, anh hudng cua khai thde him Id phia du-ai din moong 10 thidn vd b l m|t dja hinh phg thuOc vao mpt so ylu t l nhu chiiu cao khlu, kich thudc guong khai thac him Id, dO sdu khai thde va vide d l lai trg bao vp trong khai thac him Id.
o l nghien cuu thyc nghipm trong phdng thi nghipm cde qua trinh djch dOng, Vidn Khoa hpc Cdng nghp Md da tiln hdnh xdy dyng md hinh vpt liiu tLfong duong md phdng m|t clt dja chit tuyln XVI khodng sdng Khe Cham (hinh 7) vdi ty Id 1:100. Nphidn cuu cdc kit qua quan trdc va tinh todn djch dOng tren md hinh vpt lipu tuong duong cho thly, dpc dilm cua cac qua trinh biln dpng, pha huy va djch chuyin cac Idp dit dd tren md hinh ve CO ban phu hpp vdi cac quy ludt djch chuyin theo tinh toan ly thuyit cung nhu quan trac djch dOng trong thyc t l .
o l kilm chu'ng cdc kit qua nghidn cu-u ly thuyit cQng nhu- thyc nghipm tren md hinh vgt lidu tuong duong, dong thai qua do xac djnh cac thdng so
KHCNM SO 1/2012* CNKT HAM L 6
vOng Quing Ninh
TT 1 2 3 4 5 6 7 8 9 10 11 12 13
Tdn gdc
G6e djeh chuyin gidi hpn theo dudng phu'o-ng
Gde djeh chuyen gidi hpn theo hu-dng doc ldn
Gde djeh ehuyin gidi hpn tiheo hu-dng die xuong
G6c djeh ehuyin theo dudng phu-ang Gde djch ehuyin theo hu-dng d i e Idn Gde djeh ehuyin theo hu-dng d i e xuIng Gde nirt tdch theo du-dng phu-ang Gdc nirt tdch theo hu-dng d i e ldn Gdc nu-t tdch theo hudng doc xuong G6c syp do hodn todn theo hu-dng doc xuong
Gdc sup d l hodn todn theo hudng die Idn G6e sgp d l hodn todn theo hu-dng du-dng phu-ang
G6c lun cg-c dpi
Ky hi|u
6o Yo
Po 5 1 .
P,
_5
...Y.', „
P _
' ' * 2
4^3
e
Old
65-70 65-70 36-50 75-80 75-80 45-60 80-85 80-85 '55:65 "
50-55 56-69 52-58 60-70 djeh ehuyin vd biln dang dpe
tarng eho dit dd md khu vyc vung than Quang Ninh, Vipn Khoa hpe Cdng nghd Md da tiln hdnh quan trac djch dOng tai mOt s l md ham Id bao gom Mpo Khd, Nam Mdu, Hd Lim, Mdng DLrong. Kit qua tinh todn so lipu quan trie da xdc c^nh dLPpe mOt s l thdng s l co ban, 6ugc trinh bdy trong bang 2.
Kit qua quan trac thye t l da eho thay sy phu hpp giQ'a nghidn CCPU ly thuyit vd thye t l . Day Id nhQ'ng k i t qua cd y nghTa quan trpng, gdp phln bo sung eo sd dQ' lipu cho cdng tdc nghidn eCru vd thilt k l md trong qud trinh triln khai dp dung so do khai thde hdn hpp ham Id -10 thidn.
Song song vdi cac nghidn CU'U anh hudng djch dOng, Vidn Khoa hpc Cdng nghp Md da tiln hdnh nghidn eCru cac anh hudng cua nudc trong moong 10 thidn d i n khai thde him Id phia dudi, trong dd tpp tmng nghidn CCPU cdc vung djch
ehuyin vd biln dpng khii dit dd bdn trdn do khai thde him Id phia dudi, gom vung spp do, viing nCrt ne vd vung biln dpng dec. Vide xdc djnh ranh gidi giCra vung biln dpng dec vd vung nCrt ne trdn mat cat dCrng cd y nghTa thye t l Idn, nd eho phdp xdc djnh dO sdu an todn khi khai thde him Id dudi ede d i i tupng ehCpa nude.
Trdn eo sd nghidn eCru ly thuyit vd kinh nghipm khai thde dudi day moong 10 thidn ehCpa nude d cde md trdn t h i gidi, Vipn Khoa hpc Cdng nghd Md dd xdc Ipp dupc ede edng thCre ly thuyit cQng nhu thye nghipm 6k xdc djnh chilu sdu khai thde an todn.
Theo dd, chilu sdu khai thde an todn dudi ddy moong 10 thidn vd bai thai d i t dd, cd kha nang tich tg nude, phg thuOc chu y l u bdi chilu day khlu than. Chilu eao khlu edng Idn thi tpo thdnh vung khe nut d i n nudc edng Idn. Nhu vpy, md ed hp so chCra than /en cang
nude. Hp s l /en ldn thi b l ddy khlu than cQng Idn, tao ra nhilu khdng gian ring ed kha ndng tich ehCra nude trong Idng dit. Vdi cde md cd /en 'dn nhu Thong Nhlt, Tdn Lpp... glQ-a mua khd vdn ed t h i buc nude tdi ea ngdn rn^lh do kha ndng tich ehCpa nude dudi dit rat Idn trong dd vdch. Id cQ .v.v.
Nghidn eCru dpe dilm dja chit thuy vdn, dja chit edng trinh vung than Quang Ninh eho thly, dja ting mOt so khu vyc viing Quang Ninh ed c l u true don nghidng, clu taie nip uln hope Id sy tong hpp eua hai lopi clu true ndy. Do phan Idn cdc ting dit dd diu ed 10 via trdn mpt dit ndn ede ting dit dd din nude tit (bao gIm ea via than antraxit) ed eo hOi tilp nhdn nudc mua, nude mat, nude trong moong 10 thidn bo cap eho nude dudi dit Idm tang ddng chay, dong thdi, nude mat tham chay theo ede khe nCrt tdch Idp xuong sdu rit nhanh.
Theo ddnh gid eua Vidn Khoa hpe Cdng nghp Md, ddy Id eae lopi clu tnjc bat Ipi doi vdi khai thde him Id dudi khai tardng 10 thidn chCra nude.
c l u tnjc nip uln thudn Ipi cho nudc ngam tich dpng trong ddi dOng tg nip Idm, hinh thdnh ede Idng trao chCra nude dp lye bdn trdn via than. Ody Id eau true diln hinh eua ede khu vyc md Hd Lim, Binh Minh, Khdnh Hda. Kinh nghipm thye t l cho thly, cde Id ehp khai ddo d ddy cdc nip Idm hay dOng tg se cd lupng nudc chay vdo Idn g l p 3 ^ i l n so vdi Id chp khai ddo cung mCre nhung nam d dinh n i p loi. Do do, Id chp khau than trong ede nip Idm cd didn tich tiep nhdn nude mua trdn b l mpt dja hinh
KHCNM SO 1/2012* CNKT HAM L 6
"W
Thdng tin khoa hpc cdng nghe md thdng thudng ldn g l p 2 i l n sovdi Id ehp khlu trong c l u true don nghieng ndn vdi eung mOt trpn mua ldn, cde Id ehp khlu than d eung dO sdu nhung d ddy n i p Idm thudng bj ngpp Igt nhanh hon Id ehp khlu than d ede don nghieng.
Vdi ddc dilm dja ting nhu trdn, trong rit nhilu trudng hpp, mac du moong 10 thidn ndm ngodi vung anh hudng djeh dOng bdi khai thde h i m Id dudi. Tuy nhidn, nude chua trong moong vdn ed t h i chay vdo Id khai thde. Nguydn nhdn d ddy Id do t i n tpi mOt ting ddn nude ndm ben trdn Id khai thde vd bdn du-di khai trudng 10 thidn, giao cdt vdi ea hai vung khe nCrt Id: vung khe nCrt d i n nude, hinh thdnh do khai thde him Id; vd vung khe nCpt dudi ddy khai trudng 10 thidn, hinh thdnh do hopt dOng khai thde 10 thidn hope do phd huy eua nude trong moong 10 thidn.
Ngodi ede y l u to anh hudng ndu trdn, kha nang xult nude tir moong 10 thidn vdo md ham Id cdn ed t h i do ede nguydn nhdn nhu t i n tai ede khoang I edeto, cde dCrt gay kiln tao trong vung khai thde, ed kha ndng ddn nudc hope chCra nudc. Thdng thudng, tardng hop d i n nude se it nguy hilm hon trudng hpp chCra nude. Bdi vi, n l u ede d i i tupng nay ehi d i n nude, ta cd t h i tinh todn luu lupng nudc chay vdo md, tu' dd dua ra cdc bidn phdp thodt nudc hpp ly. Trong trudng hpp d i i tupng ndy chCra nudc bdn trdn Id khai thac, ludn tilm an nguy co bgc nudc b i t ngd, thudng gay ra cdc sy co nghiem trpng, can trd k l
hoach khai thde, thdm ehi gdy nguy hilm ehit ngudi.
Trdn co sd cde kit ^ u a nghidn cu'u anh hu-dng qua Ipi trong so d l khai thde hln hpp him Id - 10 thidn nhu dd ndu trdn, Vidn Khoa hpe Cdng nghd Md dd d l xult mOt s l giai phdp ky thupt edng nghd sau:
Giai phdp gidm dnh hudng eua n l min 10 thidn d i n edng trinh h i m Id phia dudi: ndng eao hidu qua SIP dyng ndng lupng n l hQ-u ich bdng cdc bidn phdp n l min vi sai cOt thulc lidn tuc, thay d i i c l u true lupng thulc trong l6 khoan, kit hpp vdi vide lya ehpn so d l n l , vj tri khdi n l vd hudng truyin n l hop ly;
khoanh vung tdc dgng n l blng SCP dgng mdn chdn sdng, SLP dgng bidn phdp n l min tao bidn; SLP dgng phuong phdp khoan nghidng; khai thde h i m Id cdch dipn edng tdc khai thac 10 thidn d khoang cdch an todn, dam bao khdng bj anh hudng cua n l min 10 thidn;
- Giai phdp giam anh hudng djch dOng do khai thde h i m Id phia dudi din dO I n djnh cua bd moong 10 thidn: fc)l tri k l hopch khai thde him Id vd 10 thidn hop ly, dam bao khdng ding thdi khai thde bdng ea hai phLPong phdp trong ciing mOt phpm vi hpp; b l tri trinh ty khai thde him Id, hudng tiln guong Id chp, sao cho anh huo-ng djch dOng d i n bd moong 10 thidn Id thip nhlt; nghidn CLPU dp dgng cdng nghd khai thde him Id sCi- dgng phuong phdp dilu khiin vdch bdng chdn Id tai nhQng khu vyc cd cdc cdng trinh trdn mdt cin bao v | vd dudi cac moong 10 thien cd chCra nu-dc;
Giai phdp giam anh hudng cua nudc chCra trong moong 10 thidn d i n khai thde
h i m Id phia dudi: khai thde h i m Id d chilu sau Idn hon chilu sdu khai thde an todn;
xdy dyng cdc muong thodt nudc vdnh dai vd to chCrc bom thodt nudc khai trudng 10 thien hop ly; hodn tho moong 10 thien sau khi kit thuc khai thde dam bao phgc h i i t i n g phu, tham thye vdt, nhdm phdn tdn lupng nudc mua, giam xdi mdn, dpc bidt gidm lupng nudc mua tin dpng trong cdc khe nCrt xuIng sdu; bom, phut dp vCpa gia cudng d i t dd vdo hang hoc, khe nCrt trong d i t dd dudi dp lyc eao tao ra ede gdn kit mdi lam gia tdng dO I n djnh, cudng dO chju lyc vd chlng chju nudc cua d i t dd; d l Ipi trg bao vd hop ly khi khai thde h i m Id; giai phdp khai thac dp dgng chdn Id todn phln.
Ngoai ra, can tien hdnh tinh todn dy bdo kha nang syt lun bl mdt dia hinh vd bd moong lp thien khi khai thac tilm Id phia dLPdi vd quan trie, kilm tra djnh ky djeh ehuyin, biln dang eua bd moong 10 thien trong qua trinh khai thac d l dy bao vd ed bipn phdp XLP ly kjp thdi cdc sy d .
o l dp dgng cdc giai phap ky thudt va cdng nghd ndi trdn vdo thyc t l san xult, c i n thilt phai t i l p tgc nghien CCPU thii' nghidm, lya chpn giai phap phu hpp vdi tirng dilu kipn md cg t h i . Trong thdi gian tdi, ViOn Khoa hoc Cdng nghd Mo Vinacomin se t i l n hdnh thdm nhilu nghien CCPU bo sung nham ddnh gid mOt cdch chinh xdc dieu kidn dja chit ky thuat md viing than Quang Ninh, qua dd lya chpn giai phap ky thuat phu hop nham loai tru- va han c h l nhQ'ng anh hudng tidu cyc trong khai thac hdn hop ham Id-Id thien./.
KHCNM S6 1/2012* CNKT HXM L 6
