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Thdng tin khoa hpc cdng nghe md Dff NH G l ( i HI^N TR6NQ Vf! NGHIEN CUU t>E XUfiT GIAr PHAP PHA HOA BAN DAU DA VACH CHO CAC LO CHO OAI TAI CONG TY THAN NAM MAU At coal deposits of Nam Mau Coal Compan[.]
Thdng tin khoa hpc cdng nghe m d Dff NH G l ( i HI^N TR6NQ Vf! NGHIEN CUU t>E XUfiT GIAr PHAP PHA HOA BAN DAU DA VACH CHO CAC LO CHO OAI TAI CONG TY THAN NAM MAU At coal deposits of Nam Mau Coal Company, the coal reserves at the medium to thick coal seams with the angle of gentle to inclined slope account for high proportion, about 60% of the total resen/es needed to be exploited After evaluating the cun^nt situation of coal mining operation at these deposits, the paper proposes the solutions for roof initial caving collapse for longwatts at Nam Mau Coal Company Tgi khodng sang Cong ty than Nam Mlu quan ly va khai thdc, try lugng cdc vFa than thuOc logi ddy trung binh d i n day, thoai den nghieng chiem ty Ig Ion, khoang 60% tong tru lupng huy dpng vao khai thac D l khai thdc cac khu vyc nay, Cong ty da dp dung he thong khai thdc cot dai theo phucng khau todn bp chilu ddy via hogc khIu lo-p tru hg tran than ndc vd h$ thing khai thac chia lop nghieng, vgi cdc Id chg khIu than bang khoan n l ching giiJ* bang cpt thuy lyc dgn kit hgp voi xa kim loai ho$c gid thuy lyc di dpng hoac gid khung thuy lyc di dpng; 16 chg OCT gio'i h6a d i n g bg vgi mdy khIu vd ddn ehong ty hanh co k i t c l u hg tran, dilu khiln dd vdch cho cac 16 chg bang phucng phap phd hoa todn phin Nhung nam g i n day, cong tdc quan ly ky thuat tgi Cong ty Than Nam Mau da co nhieu tiln bp Tuy nhi^n, v l n c6n mpt s i t i n tgi CO lien quan t6'i cong tac phd hoa ban dau da vdch nhu: mpt so 16 chg sau pha hoa ban d i u tgi 16 chg vach vd dua 16 chg trg vdo khai thdc da xay hign tugng dd vach treo; TS TRLraNG DUC DU" ThS T R A N T U A N N G A N Vi$n Khoa hgc Cdng nghd Md - Vinacomin ThS, PHAM HdNGTHAl Congty than Nam M§u- TKV Bidn tdp: TS Taxing OCrc Dw mpt so 16 chg phai thyc hign la! cong tac phd hoa ban d i u ; hoac mpt so 16 chg dp dung giai phdp phd hoa phd hoa ban ddu chua phu hpp vo'i dieu kign da vach , ti> do, lam tang chi phi san xuat vd co the d i n den mat an todn khai thdc 16 chg D^ khdc phyc tinh trgng trdn, Cong ty than Nam Mlu da phoi hpp vo'i Vign Khoa hpc Cong nghg Mo thyc hi^n cong tac "Danh gia hien trgng va nghidn cCeu d l xult cac giai phap phd hoa ban dau da vach cho cac 16 chg ddi tgi Cong ty than Nam Mdu", d l giup Cong ty chu dgng vigc lya chpn, tinh todn vd dp dung thyc t l cac 16 chp, dam bap khai thdc cdc 16 chg on ^ n h vd an todn phugng, eg g\&\ hoa ding bp khai thdc sir dung ddn ching ty hdnh ket hgp vgi mdy khIu than dp dgng cho cdc via ddy >3,5m, g6c doc 3,5 met; a s 45° {7 16 chg); cong nghg khai thac cpt dai theo phuong, ching giu bang cpt thuy lyc do'n k i t hgp voi xd kho'p d l khai thdc cdc via than day trung binh, doc thoai den nghieng m =1,21^2,5 met; a ^ 35° (10 16 chg); cong nghe khai thac 16 ehp ngang nghidng hoac 16 dpc via phan tang, Hien trang khai thac va ching giu bang gia thuy lye cong tac pha hoa ban ddu XDY (hoac gid khung), dp dgng cdc Id cho' tai Cdng ty than cho cdc via than day, doc Nam M l u nghieng den d i e 6(mg (m> 3,5 Trong nhung nam qua, met; a > 35°) Cong tac cfieu Cong ty than Nam Mdu tap khien da vach dugc thyc hign trung khai thac o" via chinh, bdng phugng phdp pha hoa bao gom vfa 4, 5, 6, 6a, va vfa toan phan 8, theo tong hgp t u nam 2011 Ngoai nhirng sg d l e6ng d i n nam 2013, Cong ty da va dang khai thac khoang 20 16 nghg khai thac trdn, C6ng ty c6n ap dgng so d l eong nghg chg dai Cong nghg chu yeu dp dung khai thac cpt ddi theo khai thae cpt ddi theo phuong KHCNM S6 7/2014» CNKT HAM L Thong tin khoa hoc cong nghe mo Bing Sin luong khai thic cOa Cdng ty Nam Mlu ti> nSm 2011-2013 San luvng than theo cong nghe khai thic TT Nam khai thac l-dch^ CGH L.6ch^ GK Lochof TLD Ldch^ khau buong thu^g Tong c^ng 14.651 5.256 255.002 1.860.969 43.934 6.896 6.275 270.719 1.697.678 205.343 813.071 171.497 236.662 27.633 324.792 1.832.271 2011 171.688 865.366 171.631 367.676 2012 63.645 2013 Tong 440.576 2.500.318 568.029 863 664 COng 8,19 Dio vi xin 16 chuin bj 821.881 225.001 259.327 Tylg cOng ngh? (tan) L6 chgr ngang L6ch 16 thugng kho'i mpt I6p hit toan bp chieu day vdch theo phugng phdp tren, Ip dilm theo hO chilu ching bang vfa (Id chg thuy lyc dgn): sau thupng khdi dilm bam tru cac vi ching gd (luIng gugng thyc hign cdng tac pha hda dugc dao phia trudc khdng vd luIng g i n gugng duge ban dau xong, cung c l Id chg gian da dugc khai thdc pha hoa ching bdng gd thiu dpc hcgc vd tiln hanh khai thdc thudng ban d i u 0/ Id chg vdch khoang g l doan, luong bao vg ching ky (nlu 16 chg khai thac ching 2,0m L i p dgt vi ching vdo 16 giD" bang cac cui Ign g l ) Trong bang vi gl) Trudng hgp 16 chg thygng bam trg, thyc hign cdng qua trinh khai thdc Id chg de khai thac thudng ky ching tdc ban pha trg phia sau 16 chg chuin bi cho cdng tdc phd hoa bing eac logi vi ching thuy lyc, d l dilu khien tran than va da ban dau, cdc cui Ign dugc x I p sau thyc hign xong cdng tac vdch dua Id chg ve khai thac KHCNM sO 7/2014' CNKT HAM LO Thong tin khoa hpc cong nghe nfio thudng ky (hinh 2) * Phwong phap pha hoa ban dau da vach 16 chg theo each pha n616 thitong vdch ket hep vdi cdc 16 cup cOa C6ng ty than Nam Mdu (pha hda ban diu cho 16 Cher ca gi&i hda) Via Nam Mdu cd da vdch tugng doi eung vung, n l u d l ndng eao mue dp an todn, trud'c khai thac Id chp cc gid'i h6a cung thyc hien cdng tdc phd hda ban diu De ehuan bj cho cdng tac pha hda ban diu, tu Id dpc via vgn tai cua Id chg trg dao Id noi sang vach vfa Tgi vj tri ggp vdch vfa, each Id thugng kho'i diem tir 4-^ 5m, ddo Id thugng bam vach dpc theo chilu dai Id thugng khdi diem, sau dd tien hdnh ddo cdc cup v l phia trudc (cung chilu vgi hudng tien gucng cua Id chg) vol chieu ddi moi cup theo phuong Id 3,5m, theo chieu d i e 16 chg eac cup dao each •*• 8m trg than giua hai hdng 16 L i p dgt ddn ching ty hdnh vdo 16 thugng khdi dilm Idp trg, sau dd tiln hanh khoan n l ddnh sgp cdc cdp vd Id thupng vach Cac Id cCip vd Id thugng vdch dugc pha n l theo thu ty lan lugt tLc trdn xuong dudi theo chilu d i e Id chg Sau hoan cdng tdc phd hoa, cung eo toan bp 16 chg, tiln hdnh khai thdc thudng ky (hinh 3) Danh gia cong tac khai thac pha hoa ban ddu da vach cac Id chgi' dai Cong ty than Nam M l u Cdng tac dieu khien da vach ndi chung va cdng tde khai thac phd hoa ban dau da vach 16 chp ndi rieng ddng vai trd quan trpng cdng tac khai thdc 3a B6 td t§ phd nd Id thux^ng vdch ket hgp vdi Id cup d Id chg CO gidi hda 3b Ld chg sau phd nd Id thugng vdch kit hgp vdi Id cOp Hinh H0 chiiu phd hda ban diu theo cdch phd n6 Id thwgng vdch kit hgp v(» Id cQp Id chg ca gidi hda KHCNM sd 7/2014* CNKT HAM L Thong tin khoa hgc cong nghe mo 16 chp B i i vdi 16 chp khai thac mdt Idp h i t chiiu d l y via (16 chp bim vich va bam tn,i), vigc phi hda ban d i u da vieh cung nhg vigc diiu khiin vach thgo hi$n chu dpng hon vi 16 chp tiip can tn/e tiip vdi d l vIch Doi vdi 16 chp khai thac toan bp chiiu dly via bang mpt 16 chp bim tnj, tran thu h i i than ndc, vi^c p h i hda ban dau d l vIeh 16 chp thi/c hign phirc tap hpn phai md them 16 chp bim vIch Trpng ting s i 2016 chp cua Cing ty khai thic thdi gian qua cho thiy, vi tri pha hda ban d i u cac 16 chp c6 dac diem I I nam g i n c i c khg vgc da khai thic cQ, ranh gidi khai thac, phay phi, dirt g l y hoac c l e khg vgc via d i e da khai t h i c xong Do diig kign, dac dilm c i u tao d l vIch tn,rc tiip d c i c 16 chp nly hiu hit la bpt kit i n dinh v l cd tinh sgp dc trung binh, Cdng ty da I p dgng phgpng phip p h i hda ban dau Id chp theo phuong phap truyin thing cho 16 Id chp, d l y la phuong phip phO hpp vdi diiu kign d l vach cua c i c 16 chp Qua tinh t o l n bu'dc sgp d i ban dag d l vach c i c 16 chp eho thiy, cd 16 chp khai thac d i pha hda ban dag vdi chiig dai theo phgong ngan chua phD hpp vdi diig kign vIch Buiic sgp d i ban dau d l vIch 14m, dd khai thac 16 chp g i d i thg'c hign cong t i c p h i hda ban dau chi tir +10m ( k i ca Id thu'png khdi dilm), khdng gian khai t h i c theo phgong cua Id chp chga dam bao khiu dO cho p h i hda ban diu Mgt khic, cdng tac khoan n i p h i hda ban d i u 16 chp, Cdng ty chi thgc hi#n danh s|p d l vach dpc theo tuyin guong 16 chp (bang hang 16 min), Igi dpc thgo 16 thupng khdi diim; 16 vgn t i l va 16 thdng gid phin khdng gian da khai thic khdng dgpc khoan n i cat chan, v|y higg qga cong tao danh sgp vIch b| han c h i , ddi chua sap triet d i , q g l trinh khai thac 16 chp tiip theo phai tang cudng cung c i va tiip tgc cgdng buc d l vIch sap d i hoan toln Ngoii ra, cd Id chp I p dgng phg'ong phip p h i hda ban dau bang each p h i n i ciip, chiiu dai m i l cup 3,5m, khiu dp cho p h i hda ban dau d l vIeh dupc tinh toln tir 12 + 14m, nen khong dgt yeu cau p h i hda - (y mpt so 16 chp CP gidi hda ding bp cd da vIch cirng vCjng lua chpn phuong phip p h i pha n i cdp d i lam y i u d l vach trudc dua Id chp vao khai thic Song chieu dai cac cup ngan nen qua trinh khai t h i c 16 chp tilp theo, da vIch bi treo gia tang I p luc len d i n ehong - D i i vdi cing t i c khai thic 16 chp trg tran, mpt so 16 chp cd chiiu day via >4,5m, cho phep b i tri Id thupng khdi diim cua Id chp Idp trg nam dudi khg p h i hda cua Id chp Idp vach nhung v i n thgc hi$n b i tri thupng khdi diim Idp trg a phia trude khing gian da p h i hda ban dau cua 16 chp vIch khoang 2,0 + 2,5m, nen tang Nhin xet: - C i c giai phip phi hda ban ton thit than Nghidn ciJ'U d i x u i t giai dau Id chp I p dgng tgi Cing ty than Nam Mau thdi gian phap pha hda ban d i u da qga cd gg diim la: hau h i t c i c vach cho cac Id chp* dai tai Id chp dupe chuin bj va thi Cdng ty than Nam M l u , cdng p h i hda ban d i u theo Theo k l hoach khai thic c i c phuong phip pha hda truyen Id ehp tir nam 2014 + 2015 da thong Phuong phap phii dupc T i p dean phe duygt, hpp h i u h i t vdi diiu kign d l Cdng ty khai thic tgi c i c khu v i c h c i c In chp cua Cong ty vgc cac via neu tren vdi ting s i Da giai q u y i t tuong doi can 27 Id chp, bap g i m cac Id chp ban dgpc c6ng t i c p h i hda d elc via nhu sau: Via cd 316 ban dag cho cac Id chp, dam chp khai thac ching giO' bang bao cong tac khai thic dupc an c i t ching thuy Igc don; Via toln cd 216 chp khai thic ching giu M|c dii da lua chpn bang g i i khung thgy Igc di phuong phip p h i hda ban d i u dpng, Id chp co gidi hda; Via phii hpp, song thgc t i ap cd 16 ehp khai thac ching dgng, vigc Iga chgn khau dg glQ' bang gia khung thOy Igc di p h i hda ban dau d mpt s i id ddng; Via 6a cd Id chp khai chp chga thgc su hpp ly: chiiu thic ching giu bang g i i khung dai theo phuong khai thac cua thuy luc di dpng; Via cd Id mpt s i 16 chp de thgc hign p h i chp khai thic ching giu bang hna ban dau ngin hon nhieu so g i i khung thuy Igc di dpng, Id vdi budc sgp ban dau cua chp CO gidi hda; Via cd Id d l vach Hp chilu khoan n i chp khai thac ching giir bang p h i hda ban d i u Id chp cpt ching thuy Igc don; Via cd 916 chp khai thic ching giCr chua hpp ly KHCNM S 7/2014'" CNKT HAM L Thdng tin khoa hpc cong ngh# mo bang cpt ching thuy Igc don * Nghidn cCru danh gia tinh chat da vich cac via than ciJa Cdng ty than Nam Miu Qua ting hpp dieu kign dja chit ciia cae via than tir c i c c6ng trinh 16 khoan v l cap nhlt dia chit b i sung tir cac dudng 16 c i c khu vuc khai thic, cd t h i dinh gia dieu kign d l vach ciia cle via than nhu sau: - Tinh 6n dinh cua di vich: Tinh i n dinh dupc dgc trung bdi dign tich Ip tran va khoang thdi gian ton tai cua no sau khiu than Theo tinh i n d|nh, d l vIeh dupc phan logi: vIch rit khdng on dinh, vach kh6ng i n djnh, vIeh on dinh trung binh, vIch i n dinh D l vIch true tiip cac via than thupc Cong ty than Nam Mlu thinh phan chu y l u la bpt kit va d6i chd I I sdt kit K i t qua theo ddi q u i trinh khai thac trudc day cho thay: d l vIch true tiip ed dien Ip khoang 10 +15 m^ tri trcng khoing + gip Theo phan loai ciia VNIMI, da vach d o via than thupc loai tir on ffinh trung binh din i n dinh - Tinh sip cua da vach: Tinh sgp d i dupe dac trung bdi budc sgp d i v l kich thudc khii ciia Idp da vIch sau viing khai thic Theo tinh sgp dupc chia d o logi vIeh: rit d i sgp d i , d l sgp do, sap trung binh, khd sgp d i , rat khd sgp d i Dinh gia tinh sap d i ciia d l vach dua tren cp sd xgm xet dgc dilm s|p d i vIch, dga vIo dp b i n , sg phan Idp va nirt ne ciia d l v l mdt s i y i u t i khic Da vIch true tiip elc khu vuc khai thae eiia Cdng than Nam Mau hau h i t I I bdt phia tren g l y hign tupng tai kit va set kit, dp b i n nen set trgng dpng kit 150 + 300 kG/cm^, d i i vdi Theo cac phan logi tren, da bgt kit 300+750 kG/em^ Chiiu vIch true t i i p cua khu vuc Id day ting cpng da vach tnj'C tilp chp ciia Cdng ty thudng nam thay d i i tii'4,5+11 met, d l vIeh khoang 3+ l i n chiiu true tilp phan Idp mdng d i n d l y via Trong tm'dng hpp trung binh Hau h i t cac Idp da vach cIJa cac via than thupc cuii ciing sit via than la acgillt logi cd tai trpng tmng binh d i sap khoang tir 1+2 Tinh didu khien cua di met, cac Idp Igi budc gay vich: la tinh chit cua d l vach thudng W^ cua da vach nam dudi su t i c dpng ting hpp cua khoang 4+ mdt Ting cac bien phip dupe I p dgng d i hpp cac tinh chat tren va dga diiu khiln va ching Tinh vao phin loai VNIMI d l vIeh diiu khiin cua d l vach phg true tiep ciia cac khu vuc via thugc vao r i t nhiiu y i u t i , eiia cle Cong ty thudc loai sap nhung chu y l u phu thugc vao d i trung binh d i n khd sgp d i tinh i n dinh va tinh chat tai - Tinh chat tai trgng cua da trpng cua d l vIch vich: I I tai trpng ciia d l vIch Cac khu vgc khai thac cua t i c dpng len cdt ching, dupc Cdng ty cd d l vach trgc tiip quy ude vdi chiiu day cua d l thupc Icgi i n djnh trung binh vIeh bang 10 l i n chiiu d l y d i n i n djnh, cd tinh chat tai khau cua via than Tinh chat tai trpng trung binh Trpng qui trpng eiia da vach phg thupc trinh khai thic Id chp, cdng tie vao su phan bo, sap x i p va diiu khien da vIch chi I I tg sap tinh chat ciia cac Idp nham d i Trudng hpp vIch treo, thgch tao vIch (trong khoang Cdng ty tiin hanh khoan n i chiiu cao do) v l chiiu d l y cudng bCrc bo sgng d i i vdi cle khau Danh g i i tinh chit tai Id chp b i m vach D i i vdi cle Id trpng cua d l vIch dua vao ty chp bam trg hg trin thg hii s i chiiu day cua Idp da vach than ndc, Cdng ty chga cd bign true tiip (h) va chiiu cao khai phap t i e ding t^rc tilp vao d l thic via than (m) Cd loai vach ma chi thuc hign b i sung vIeh x i p theo tinh chat tai tang cudng ching glD' d guong trpng: khiu don gian Tuy nhien, vdi - VIeh nhe: h/m > (6+7) VIch sap sau dich chuyin vi ching, chieu dai vIch treo khdng Idn hon 2,0m, khdng hinh chu ky hg vIch phgpng phip khai thic va ching giO" nhu hign tgi guong 16 chp van d i m bao an toln, da vIeh da sgp vdi chiig cao chen l i p bing e l chiiu day khiu Nhu vgy, cd t h i x i p logi - VIeh trung binh: (3+4 ) < d l vIch cd tinh diiu khiln tmng h/m < (6+7) VIeh s|p d i vdi binh chilu d l i bi treo 2+6m v l vach Tdm Igi, tinh ehit d l vach cd chu ky khu vuc khai thic thudc - Vach ngng: h/m < (3+4) Chu ky hg vIch cua cac Idp KHCNM S6 7/2014' CNKT HAM LO logi vach cd tai trpng trung binh, cd tinh on dinh, tinh sgp Thdng tin khoa hpc cong nghe md d i va tinh dieu khiln tmng binh Vdi tinh chat tren d l vIch via tupng doi thu|n Ipi, it gay khd khan eho cdng t i c khai thic va diiu khiln d l vach bang phuong phap pha hoa toan phan dd khoan, n i cudng hire hinh (a, b) cho d l vIeh trgc tiip sgp do): Theo phuong phip nay, ap dung eho cac 16 ehp cd da thay vl vigc khoan n i chi vach tnj'C tiip thgpc logi i n Sinh bang hang Id dpc theo Id trgng binh d i n i n djnh (nim chp d luong phi hda nhu dang true tiip tren via than I I cle Idp thgo hidn, cac 15 de pha set kit cirng, Idp bot kit) va d i i hda ban d i u Id chp dupe b i tri - i.ya chqn cic giai phap vdi so d i cdng nghg: Khai thae nhg sau: Khoan ngp no cac phi hoa ban dau cho cic Id toan bp chiiu day via bang mdt hang lo dpc theo chu vi cua cha Id chp khiu bim vach, bim tru phgm vi 16 chp da khai thie Viec lua chpn giai phap p h i via ehong gitj' Id chp bang cpt khau phi hda ban diu, ching thuy Igc dpn hoac Id chp bao g i m mpt hang 16 doc hda ban d i u eho elc 16 chp, dga tren cac co sd v l cac y l u trg trin thg h i i than ndc theo 16 thupng khdi diim, hai ching giu' 16 chp bang gia hang Id dpc thee 16 ehp, t i sau: hai hang 16 dpc theo 16 dgc - Quylt dinh V/v "Ban hanh khung thuy luc di dpng, xem hudng dan thgc hidn v i cdng Gapqft tac pha hda ban d i u v l chia Idp khai thic 16 chp" ciia TKV s i 1617/QO-V.INACOMIN, ngly 20 thing nam 2012 - Dac diem diiu kign v l tinh chit da vach cac 16 chp du kiin khai thac tgi C6ng ty than Nam Mau, giai dogn.2014 + 2015 - Kinh nghigm khai thic v l phi hda ban d i u id chp d l i cua Cdng ty than Nam M l u - Dgc diim vi tri p h i hda ban d i u cac 16 chp k i hogch khai thic cua Cdng ty than 4a Bd tri Id phi hda ban diu, Nam Mlu d i n nam 2015, theo truing hap Id cha khiu m0t Idp bim vich bim tru via binh d i tinh tru' lupng - Kit qua tinh toln budc sap d i ban d i u d l vach true t i i p ciia elc 16 chp tgi c i c vj tri p h i hda Tren ca sa do, cic giai phip di pha hda ban dau cic Id cha dai cua Cong ty than Nam Miu duvc /(/a chan, nhw sau: - P h i hda ban d i u Id chp theo phuong phip truyin thing (tir Id thupng khdi dilm khai thic bing 16 ehp ching'gd truyin thing cd chiiu dai theo 4b Bd tri Id phi hda ban diu, truing hap khiu Id cha tn^ trin phuong d i n bude sgp d i ban Phi hda ddng thai dinh sip Id cha vich d i u cua da vach tnj'C tiip, sau Hinh Phi hda ban diu Id cho theo phuang phip truyen thdng KHCNM S 7/2014* CNKT HAM LO Thong tin khoa hoc cong nghe md via thdng gid v l v | n tai Khoang cIch giua c l e l i mdt hIng tir 2,0 + 2,5m, chiiu d l i m i l Id t i i thilu 2,0m, lupng thuic n i m i l |3 tir 0,8 +1,0 kg theo tinh chit cua d l vich true tilp - P h i hda ban d i u Id chp theo phuong phap pha no Id thupng vich k i t hpp vdi cup, ap dgng cho cle Id chp co gidi hda ding bp, xem hinh (a, b) Theo phgong phap nay, tren co so budc sap ban d i u cua da vich trgc tilp, dao Id thupng bim vach phia sau 16 thupng khdi diim cua td chp trg Vj tri ciia 16 thupng b i m vich theo phuong cIch Id thupng khdi diim cua Id chp tnj bing 1/2 chiiu d l i budc sap ban d i u ciia d l vach true tiip Sau dao xong Id thupng vich, tiin hanh d i o c i c Id cup Bi tgo diiu kign thdng gid, c i c ciip dgpc d i p theo phgpng tir 16 thupng vach hai phia tgo thinh mgng dudng Id xuong ca va cd chiiu d l i ting cdng bang chieu d l i s|p d i ban d i u cua da vach true tilp Vj tri guong ciip v i phia 16 thupng khdi diim cua 16 chp trg cIch hing 16 thupng khoing 1,5m theo phuong, khoing cIch giOa c i c cup dpc theo Id thupng vach tir + 8m Khoan n i p h i hda ding thdi d Id thupng vich va p h i n i elc cup phgm vi dogn 16 thupng vich bang cac d l i l i khcan, mdi dai lo khoan cIch tCr 1,5 + 2m Trong m i l dai bo tri 2+3 l i khoan len vich via, chiiu dai elc lo khoan tir 2+ 2,5m (toi thiiu 2,0m) Lupng thuoc n i ngp c l e 16 khoan t i i da 1,0 kg/1 16, Igpng 5a Bd tri Id phi nd cOp vi Id thuang vich 5b Ld cha sau phi nd cOp vi Id thirang vich Hinh Phi hda ban diu Id cha theo phuang phip phi ndid thuang vich kit hap v&i cdp thuic n i nly b i tri cung ttiy danh gia hoan thidn cdng tie thupc vao dd cirng va mue dg p h i hda ban d i u theo cle giai phan Idp eua da vich (da vich phip da Up, Cing ty c i n sdm cirng v l phin Idp d l y b i tri b i tri trien khai I p dgng thu nhiiu thuoc hpn) Trudng hpp nghigm thuc t i san xuat./ Id thupng vach cd chiiu dai Idn 7a/ /I'gu t/iam Ithao: ed t h i chia thinh hai dogn d l YnpaaneHHe ropHbiM Aaan i min, sau pha n i xong jieHvieM, MocKsa HeApa doan thCr nhit, t i l n hinh p h i 1983 no dogn tilp theo "Bao d o dinh gii hidn Vdi cac giai phip lua chgn, trang va nghien cCru di xuit de t i i da Igp hudng dan tinh giii phap phi hda ban dau da toan v l xay dgng hp chieu p h i vich cho cic Id cha dai t^i hda ban d i u 16 chp mdt Cdng ty than Nam Mau", Vign so diiu kign cg t h i cua Cdng ty Khoa hpc Cing nghg Mdthan Nam M l u D l cd eo sd 2014 KHCNM S 7/2014' CNKT HAM LO ... id chp d l i cua Cdng ty than Nam M l u - Dgc diim vi tri p h i hda ban d i u cac 16 chp k i hogch khai thic cua Cdng ty than 4a Bd tri Id phi hda ban diu, Nam Mlu d i n nam 2015, theo truing... hda ban dau da toan v l xay dgng hp chieu p h i vich cho cic Id cha dai t^i hda ban d i u 16 chp mdt Cdng ty than Nam Mau", Vign so diiu kign cg t h i cua Cdng ty Khoa hpc Cing nghg Mdthan Nam. .. * Phwong phap pha hoa ban dau da vach 16 chg theo each pha n616 thitong vdch ket hep vdi cdc 16 cup cOa C6ng ty than Nam Mdu (pha hda ban diu cho 16 Cher ca gi&i hda) Via Nam Mdu cd da vdch tugng