Thong tin khoa hoc cflng nghe mo
NGHIEN ClJfU LITA CHON CONG NGHE KHAI THAC HOP LY CHO DIEU KIEN viA 10, MUrc +30/+280, KHU TRANG KHE II, CONG TY THAN HONG THAl'
At present, at NO" coal seam, at the level of +30/+280 of
Trang Khe II region. Hong Thai coal company there have been ThS. TRAN TUAN NGAN changes in mining conditions with great variation In its TS. PHAM TRUNG NGUYEN thickness, its average dip angle of 60°, easiVy collapsed im- ^'^" ^^°^ ''Cc Cdng ngh$ H/ld-Vinacomln mediate roof and the appearance of CO gas. Therefore, Hong
That Coal Company has coordinated with Institute of tufining Science and Technology in selecting the rational mining technology for NO" coal seam, at the level of *30/*2eo of Trang Khe II region. Hong Thai Coal Company for ensuring the safety and mining efficiency
KS. HOANG MINH THAI ThS. NGUYEN TRONG H6A C6ng ty than HSng Thii - TKV Bi^n tip: TS. Tru'ang Bin Dw
1. lUffdau
Via 10, mCfc +30/+280, khu TrSng Khe II, C6ng ty than Hong Thai bao g6m 2 tang khai thSc ia tang +30/+200 v i ting +200/+280. Ting +30/+200 dygc quy hoach ap dyng cong nghe khai thac sO dung to hgp dan ch6ng 2ANSH, ting +200/+280 dygc quy hoach ap dung cong ngh$ khai thac 16 dpc via phan ting. Hien t?i, ting +200/+280 da khai thac dygc 1 opt (trong t6ng so 3 cpt) bang cong nghe 16 dpc via phan ting, ting +30/+200 dang trong qua trinh dao 16 chuan bj.
Tuy nhien, qua trinh dao io chuin bj trong khu vyc cho thay, dieu kien via than thay doi, chieu day via than biln dpng Ion (chilu day trung binh 3,0m, doi cho day d^n 6,2m), g6c doc taing binh 50°, da vach tryctiep la set ket, set than day 0,2
•*• 1,3m d l sap d6. Dac biet, trong qua trinh dao 16 dpc via +30 da xay ra sy c6 xuat khi CO, la diu hieu cua chay npi sinh. Vgi cac thay doi nhy tren, via 10, khu Trang Khe, khong c6n dam bao de ap dung cac cong nghe nhy quy hoach da de ra. Chinh vi vay, Cong ty da phai tam dimg cong tac chuan bj, khai thac, dong tho'i ph6i hgp vol Vi0n Khoa hpc Cong nghp Mo nghien ciru lya chpn cong nghe khai thac phu hgp cho khu vyc.
hieu qua. Bai bao trinh bay mpt so ket qua nghien cifu danh gia myc dp ty chay cua than va iya chpn c6ng nghe khai thac hgp ly cho khu vyc via 10, myc +30/+280, khu Trang Khe II.
2. Nghien cifu danh gia mipc do t y chay cua than via 10, khu Trang Khe II
IVI6 Hong Thai da xay ra 6 l l n chay (va c6 nguy eg chay), trong do 4, l l n xay ra trong 16
chg via 24, 2 l l n trong qua trinh dao 16 (16 xuyen via mu'c -150, tir V11 f V24, vj tri chay tai via 12;
16 dpc via myc +30, via 10, khu Trang Khe II, vi tri chay tai IIK 148 +150). Ket qua phan tfch cac sy CO chay cho thay, nguyen nhSn xay ra chSy c6 the la do than cua cac via 24, 12 va via 10, khu Trang Khe c6 t h I c6 tinh t y chay, ket hgp vol vi^c thong gio trong qua trinh dao 16 va khai thac chya tot, t6c dp khIu gyong chya phii hgp, dan den than bj ij nhiet.
D 4 nghien cii'u, xac djnh tinh t y chay cua than via 10, khu Trang Khe II, ngay sau khi xir ly xong sy c6 khi mo tai 16 dpc via mi^c +30, via 10 (dIu nam 2015), Vien Khoa hpc C6ng nghe Mo da ti^n hanh lly mau than, thi nghiem phan tich tinh t y chay cua than. Cac mau than dygc lly tgi 5 vj tri khSc nhau thupc via 10, khu Tring Khe II, moi vj tri lay 03 m l u d^ phan tich xAc dinh tinh t y chay theo 03 phygng phap khac nhau \i phygng phap cua Lien bang Nga, Nhat Ban va Ba Lan (moi phygng phap thi nghiprn 05 miu tai 05 vj tri khac nhau). Trong do, vi?c phan tich xac djnh tinh t y chay theo phygng phap cua Lien bang Nga va Nhgt Ban dygc thyc hien tgi phong thi nghiem cua Trung tam An toan Mo - Vien Khoa hpc Ccng nghe IV16. Vi$c phan tich, xac djnh tinh ty chay theo phygng phap cua Ba Lan dygc thyc hien bang each gu'i 05 mau sang phSn tich tsi vien GIG - Ba Lan (la dgn vj c6 kinh nghiem hang d I u trong thi nghiem xac djnh tinh ty chay ciia than). Ket qua phan tich, nghien cihi tinh ty chay cua than via 10, khu Trang Kh§ II nhy sau:
- Theo phygng phap xac djnh tinh ty chay
KHC^M s o 6/2016' CNKT HAM LO
Chao mOng Ngay Bao chi Cach mang Viet Nam 21.6.2016
cua Lidn bang Nga, than via 10, khu Trang Khe II, c6 gia tri hang s6 hap phg oxy U25XB *""
0,0019 -^ 0,0052 ml/g.gio- nho hen gia tri giai han 0,016. Nhu* vgy, theo phu-o-ng phap cua Nga, than cua via 10, khu Trang Khe II khong c6 tinh tM* chay.
- Theo phu-png phap cua Nhat Ban, than via 10 CO gia tri hang s6 phan u*ng tang nhanh tu- 1,04 d i n 9,68 trong khoang tho'i gian ti> 18 den 25 phCit, khi nhiet dp m l u than Or 225'*C den 300°C. Gia tn hang so phan Crng cao thi than via 10 CO kha nang d^ chay hen so v6'i cac mau than cua Quang Hanh, Nam M l u , Khe Cham....
Tuy nhien, do chu-a c6 du ca so' du- li$u n§n chu-a khang dinh du'pc than via 10 c6 tinh tu- chay hay khong.
- Theo phu-png phap cua Ba Lan thi than khu vyc via 10, khu Trang Khe II c6 chi so nang lu-ang hoat hoa E tCr 54,3 -*• 61,9 kJ/mol. D 6 I chilu vo'i bang phSn loai tinh tu' chay cua Ba Lan thi than via 10, khu Trang Khe II c6 kha nang ti/
chay thap.
Nhu- vay, theo 3 phu'cng phap thi nghiem khac nhau cho 3 k i t qua khac nhau ve tinh tu- chay cua than via 10 (phu-ang phap cua Nga cho rang than via 10 khong c6 tinh t y chay, phu'ang phap cua Nhat Ban khong k i t lugn du'pc than c6 tinh t y chay hay khong c6n phu-ang phap cua Ba Lan cho rang than c6 tinh ty chay thap). Tuy nhien, tren thyc te, trong qu^ trinh dao 16 doc via -^30, via 10, khu Trang Khe II da xay ra sy c6 xult khi CO, la d I u hi?u cua chay ngi sinh. Do vgy, Vign Khoa hgc Cong nghe Mo da t^m coi than via 10, khu Trang Khe II vao loai than c6 tinh t y chay thap. Dk dam bao an toan trong qua trinh dao 16 va khai thac via 10, khu Trang Khe II, cIn c6 cac bien phap Crng sCr nhu- d l i vai than CO tinh t y ch^y.
3. Nghien cu-u lira chon cong nghe khai thac phu hp'p cho khu v y c via 10, khu Trang Khe II
Khu vyc 16 chy via 10, mu-c -(-30/+280, khu Trang Kh§ II c6 chieu day toan via thay doi ti> 1,2 -s- 6,2m, trung binh 3,0m, thugc loai via day trung binh, c6 blln dpng lan ve chieu day. Trong via, chu-a 10-0-4 lap da kep, t6ng chilu day da kpp thay doi tCK 0 -^ 1,7m, trung binh 0,4m. Goc doc via thay doi tie 40° -5- 55°, trung binh 50", thupc loai via d i e nghieng, tu-cng doi on djnh ve goc
doc. Than trong via Id logi bdn antraxit, c6 tinh tu" chay o" mu'c dp thip. Vach tryc tiep la tap set ket mau xam den day tu" 0,2 -*-1,3m, doi cho tryc tiep tren via than la bpt k i t day 1,3 -*- 6,6m, trung binh 1,7m; Gu'ang dp khang nen Bn tCf 48 •>• 819 kG/cm^, trung binh 253 kG/cm^, thugc logi de sap do. Vach ca ban la tap cat ket xen l i n bot kltvo-i chilu daytu'5,8-i-23m, tnjng binh 13,7m.
Cu'o'ng do kh^ng nen 6n thay doi tiF 208 -^ 3034 kG/cm^, tnjng binh 1176 kG/cm^ thugc loai sap do trung binh. Nhin chung, da vach cua khu vyc via 10, miJc -t-30/-»-280, khu Trang Khe II thugc loai kho dilu khiln. Tru tryc tilp la tap set k i t mau xam den day 0,3 -^ 2,2m, phia duo-i la bpt k i t hoac cat k i t ran chac, d6i cho tryc tiep du'O'i via than la lo-p bpt ket hoac cat ket c6 chilu day ti> 0,6 -5- 5,9m. Tru tryc tiep thu6c loai b i n vu'ng trung binh. Khu vyc du-ac x i p loai I ve khi metan va CO dilu kign dia chit thuy van, dja chat cong trinh thuan lai cho cong tac khai thdc.
Hign nay, de khai thac cac via than day c6 chieu day tCr trung binh d i n day (^ 6,0m), goc d i e tic > 45°, cac mo ham 16 vung Quang Ninh thu'6'ng ap dung mpt s6 cong nghg khai thac nhu': 16 dpc via phan ting, 16 dgc via phan ting xien cheo, buing - 16 thu'ang cheo, buing 16 thu-ang. D l lya chon cong nghe khai thac hyp ly, Vign Khoa hgc cong nghg Mo da tiln hanh so sanh u'u nhu'yc diem cua cac c6ng nghg khai thac CO the ap dung cho khu vyc, cu t h i nhu"
sau:
Via 10, mu'c +30/-I-280, khu Trang Khe II thupc loai via day trung binh, doc nghieng, biln dpng 16'n v l chilu day, tu'ang doi on djnh v l goc doc, da vach thupc loai kh6 dilu khiln, da tru bin vu'ng trung binh. Tren ca sa do, Vipn Khoa hpc C6ng nghg Mo da lya chpn c6ng nghg khai thac 16 dgc via phan tang xien chec d l ap dyng cho khu vyc. Day la loai hinh cong nghg khai thac CO ban chat g i n tu'cng t y cong nghg khai thac 16 dgc via phan ting khi cac du'6'ng 16 dgc via phan ting du-gc dao xien cheo de c6 t h i van tai than bang mang tru'pt. Vo'i each chuan bi nhu' tren, cong nghg khai thac 16 doc via phan ting xien cheo ap dgng du'pc cho dieu kign via than phLcc tap, bien d6ng manh v l du'6'ng phu'ang va chieu day via, kh6ng phu hpp khi SLP dung mang cao de van tai than Ban chat cua cong nghg nhu' sau:
KHCNM S 6 6/2016*CNKT HAM L 6 I
Thong tin khoa hoc cong nghe m o
Bing 1. Bing so sinh im nhiK/c diim da cic cdng ngh$ khai Ihic c6 thi ip dung cho Oiiu ki$n cua khu vuc via 10, khu Tring Khd II
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COng tdc chuan bi
Cdng tdc khai thcic
C6ng tdc vSn tai
Cdng tdc thdng gid
^4u'C d$
an todn
Ton t h I t than
Cic cong nghf khai thAc L6 dgc via phin tdng
- S o d l c h u I n bj dan gian- Kh6i lu-png cdc difd'ng Id it - COng tdc khai thac phi>c tap do quy trinh cdng ngh$ khai thSc nhieu cdng doan - Cdng s u i t 16 c h p t h I p hon.
- PhO-c tap. V$n tai Wian b i n g mcing cdo tgi Id DVPT, m^ng tru'pl tai Id thu'ang cdt. Cdng tac l i p d d t , c i t , t h d o t h u h l i mdng cSo tgi Id dpc via ph3n t i n g phi>c tap
- Thdng gid eye bd- D o n gian, khong phai thdng gid ngu'pc
- An toan, do vj tri gipcng k h I u du'gc c h i n g giu" c h i c c h i n b i n g gia thuy lye di ddng hoac g i ^ khung thuy Iyc di ddng.
- Cdng tSc quan ly v l m3t an toan thuSn lai
L6 dpc wa phSn tdng xi6n ch6o
Budng - Id thir^ng ch6o
- S o do c h u I n bj d a n g i i n - K h i i lupng cSc du-d-ng Id thu-png tu'ang dli nhilu
Budng Id U^myng - S a d l chuan bj phi>c tap
- K h I i lupng cSc Id thu'png hfang dfii n h i l u
- Cdng s u i t Id chp cao - Cdng tac khai thac dan giSn.
- D a n gian. V$n tai than b i n g mang truvt, cdng tac l i p d§t, thSo dCr dan gian
- Thdng gid eye bO
- T y a n g doi dan gtan, phSi thdng gid ngupe
- Thdng gid cue bO
- Khi khai thcie cdc 16 thuang eh^o thi s a d l t u o n g d l i dan gian. Tuy nhien, khi khai thac Id t h u p n g ehinh, sa do thdng gid phijc tap, phat thdng gi6 ngupc.
- Tuang ddi phuc tgp.
V$n tSi than bing mang tnrpt tgi Id t h u p n g , b i n g mang cao tai Id DVPT Cdng tac lip dat, cat, thao thu h i i mang cao tai Id dgc via phSn t i n g phO'c tap
- Thdng gid eye bd - Phijc tap, phai thdng gid ngupe
- A n to^n, do khdng cd ngu'd'i trong guang khai thSc, vi tri ci>a thdo thu h i i than d u p e chong tang cud'ng b i n g cQI Ipn vS thcinh c h i n .
- Cdng tSc quan ly ve mat an toan khd khan han, phu ttiudc vSo y thi/c cua ngu'd'i lao ddng.
- T i n that tuang doi n h i l u , do phai de Igi cSc dai trg than bao v0 Id thu'ang cdt.
- Ton t h I t than t u a n g d l i it do khdng phSi d l lai trg bao v$ giua cac cac 16 thupng cgt (thu'png chinh)
- T i n t h I t than nhilu do phai de Igi tn,i than giOa cae buong va Id thupng cdt.
KIICNM .so 6/2016'CNKT irAlM LO
Chao mfrng Ngay Bao chi Cach mang Viet Nam 21.6.2016
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D i l u kidn via Muc dg thich Crng vdi than cd tinh t y chay
So sanh Chung
Cic cong ngh^ khai thac Ld dpc via phin ting
- Mi>e dd d I u tu" Id-n do phai d I u t u mang cao van tai than, vi chong thuy lye va h§ t h i n g cap dich
C h i l u day va gde d i e t u a n g doi on djnh den on djnh
- M y c dd thfch i>ng cao do cdng tac thdng gid dan gian, khdng phai thdng gid ngupc - Ap dyng tot, tuy nhidn, phat dau t u lo'n ve mat vat t u , t h i l t bj.
Ld doc via phin tdng xi&n chdo
Budng - Id thu^g Ohio
- Mue dd d I u t u nho do van tai b i n g mang trupt, khdng phSi d I u t u vl c h i n g thuy lye va hd t h i n g cap d|ch
Budng 16 thupng - Mi>e dd d I u t u tuang d l i la-n do phai d I u t u mang cao van tai than 6- cae phSn t i n g , khdng phai d I u t u vi c h I n g thuy luc va h$ t h i n g e l p dich
C h i l u day va goc doe khdng I n djnh - Muc dd thich
LPng tuang doi cao do cdng tae thdng gid t u a n g doi dan gian - Ap dung dupe, v6n dau t u it
- T i n that than t u a n g doi nhilu - Cdng tac quan ly v l mat an toan thuSn lai
- Ap dyng dupe, von dau t u i t . - Ton that than it.
- Mt>c dd thfeh y n g thap do cdng tac thdng gid phuc tap - Ap dyng d u p e , tuy nhien phai d I u t u mang cao van tai than - T i n t h I t than n h i l u . - Cdng tac quan ly v l mat an toan khd khan han, phu thude vao y thuc cua ngudi lao dpng
Cong tac chuan bj: Theo cong nghg khai thac 16 dpc via phan tang xien cheo, m6i ting duac chia thanh cac cpt khai thac vai chieu dai theo phuang 60 -^ 80m bang cac 16 thu'ang cgt dao tu 16 dpc via van tai len 16 dpc via thong gi6 cua ting. Mdi cgt khai thac du-yc chia thanh cac phan ting c6 chilu cao 6 ^ 10m bang cac du'6'ng 16 dgc via phan tang xi^n cheo.
Cong tac khai thac: Cong tac khai thac duyc thyc hign theo hinh thu-c khIu dat tCrng cgt, cgt phia bien giai khai tru'O'ng se duvc to chuc khai thac tru-dc. Trong moi cpt, phcin t i n g tren khai thac tnfo'c phan tang du-ai. Tai moi phan tang, cong tac khai thac duac thyc hign theo hinh thuc khIu dat tu bien giai khai tru'6'ng ve phia 16 thu'ang cgt. De nang cao san lyyng khai thac, CO the to chu-c khai thac a 2 phan ting dong thd-i, gu'ang khai thac a phan tang tren tien tru-o-c guang khai thac a ph^n t i n g du'6'i 15 -^ 20m.
Cong tac khai thac tai mdi phan tang duac thyc hien bing each khoan no min pha scip tCrng
doan tru than dgc theo 16 dgc via phan tang xien cheo (tao thanh cac buong khai thac). Vigc khai thac tai cac buong khIu duxrc bat dau bang cong tdc khoan cac 16 min theo hinh de quat len phln than phia noc va hong 16 trong pham vi buong khau. Sau do, t i l n hanh xep cui lyn, lam ci>a thao tai vj tri cua buong khau, nap min cho cac Io khoan, cu'p'c cua thao va n l mtn pha s|p tnj than trong pham vi buong khau. Khi tran than da sap, cong nhan dung phia diecf\ cut (trong pham vi 16 chuan bj duac cui bao ve), tien hanh thu hoi than qua CL^a thao cho d i n khi h i t than trong buing khau, cu'yc cCea thao, k i t thuc chu ky khai thac 1 buong khau.
Cong tac v$n tai: Than thu h i i qua ci>a thao dupe van tai bang mang truot dat tren 16 dgc via phan tang xien cheo vd 16 thu'ang cpt do xuong thiet bj van tai a 16 dpc via van tai cua ting. Sau do, than dupe van tai ra ngoai mat bang theo hg thing van tai chung cua khu vyc.
Cong tac thong gio: Khu vyc khai thac dupe
^ U C H I - / V - KHCNM s o 6/2016*CNKT HAM LO I
Thong tin l<hoa hoc cong nghe mo
Hinh 1. Cdng nghd khai thic
Hinh 2. Ciu tao tuding ch§n cich ly tai Id doc via phin ting xiin Ohio
th6ng gi6 nh6 hg ap chung cOa mo. Gi6 sgch ty 16 doc via van tai qua io thygng cgt len 16 dQC via th6ng gi6 va hoa vao Iu6ng gi6 chung cua mo tai 16 xuyen via th6ng gio. Cong tac th6ng gi6 cho gygng khIu dygc thyc hi$n bang phygng phap thong gi6 eye bg. Gi6 sach tip 16 thygng cpt dygc quat cue bp day vao gygng khai thac qua ong gi6 vai. Gi6 thai t y gygng khai thac di ehuyen dpc theo 16 doc via phan ting xien cheo tgi 16 thygng cpt va hoa vao luong gio chung cua khu vyc.
Cong (ac Uioat nmc: B y g c thyc hien theo hinh thyc thoat nyo-c t y chay. Nyo'c thai chay theo ranh nygc tgi cac dygng 16 ve ho thu nygc tai myc vgn tai va thoat ra ngoai theo he th6ng thoat nygc chung cua mo.
Cong nghe khai thac i6 dgc via phan ting xien cheo c6 yu diem noi bat:
- Khong phai dIu ty vat ty, thi4t bj nhy vi chong thuy Iyc, trgm bgm nhu hoa, cac mang cao cho c6ng tac khIu gygng.
Id doc via phin t^ng xiin chio
- Thu^n Igi cho cong tac each ty de ph6ng ngOa v^ xy ly sy c6 khi c6 hign tygng ty chay xay ra.
Phan tich cac giai phap xCr \^ chay da ap dung tryo'c day tai Cong ty than Hdng Th^i cho thay, phygng phap d i p tat dam chay npi sinh bing nygc khong hi^u qua va Cong ty da phai ap dyng giai phap xay cac tygng chan each ly, bom khi njtg vao trong khu vyc chay Phygng phap d§p chay nay cho ket qua tot. Cung vgj do, Cong ty da ap dyng cac bi^n phSp ph6ng chay cho hieu qua cao, bao g6m: phun tram thanh 16 each ly than v6i khong khi d l de ph6ng chay npi sinh trong q u i trinh dao 16; trong q u i trinh khai thac:
xay dyng cac dai bao cat tai Iu6ng pha hoa de each ly khu vyc da khai thac vol gygng 16 chg.
Khoang each cac dai bao cat 30 * 35 ngay/1 dai dong thgi tang cyo'ng cong tac thong gio cho 16 chg. Doi vgj than via 10, myc +30/+280, khu Trang Khe II c6 tinh t y chay 6' mCfc d6 thap, d l ph6ng ngya sy c6 chay mo c6 th^ phat sinh trong qua trinh khai thac, Vien Khoa hoc Cong nghg Mo da de xult va thiet ke I p dyng mpt s6 giai phip an toan sau:
- Sau khi ket thuc khai thIc o 1 16 dpc via phan ting xien cheo, xay tygng chin bang bao cat d l cIch ly khu vyc da khai thIc. Khi khai thac het mSl cOt, x l y tyo'ng chan bing bao elt t?i 16 dpc via thong gio (vj tri g i n io thygng cOt d l khai thac) de elch ly cgt da khai thIc.
- L i p d|t san tram cung d p khi nitg va h?
th6ng dyc/ng ong d i n khi den 16 dgc via v|n tai
KHCNM S6 6/2016- CNKT HAM LO
Chao mirng Ngay Bao chi C I c h mang Viet Nam 21.6.2016
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••.fi.. • ...d,,.. 4. K i t lu$n
Tren eg sg d|c dilm dieu kl$n dja chit khu vyc via 10 myc +30/+280, khu Tring Khe II, Vi#n da nghien cCru lya chpn cong nghe khai thIc 16 dpc via phan t i n g xien cheo d l ap dung cho khu vyc. Oe d l phdng nguy eg ehly ngi sinh c6 t h i phit sinh trong qua trinh khai thac, Vien da lya chpn v l thiet ke c i c giai phIp bao gom: xay elc tyo'ng chan elch ly (bang bao cat) khi khai thIc xong m6i phin ting xiSn cheo v l khi khai thac hit cot khai thac; lap dat san trgm cung elp khi nitg va hg thing dy6'ng ong d i n khi d i n 16 dpc via van tai de xy ly chly khi c I n thiet; thygng ' '^!Sr .- a s xuyen do n6ng dp khi phIt sinh ty khu vyc p h i Hinh 4. Sa di bS tri dirtmg 6ng thu khI hoa thong qua dygng ong thu khi ehuyen dung
phitsinh tirkhu vvcphi hda a^t dpc theo 16 dpc via thong gi6,.. Vi?c ap dyng de xy 1;^ chay khi can thiet. c i c giai phIp neu tren cho ph6p nang cao dygc - Trong q u i trinh khai thIc, cIn thyc hien bign myc dp an toln, higu qua, sy dyng thilt bj, vat phIp phIt hi0n sgm nguy eg chay npi sinh bing t y hien c6 cua mo, ding thgi v i n thuin igi cho elch thy6ng xuyen do ning dp khi phIt sinh iir c6ng t i c each ly, xy ly khi c6 hien tygng ty ehly khu vyc p h i hoa th6ng qua dy&ng Ing thu khi xay ra trong qua trinh khai thac khu vyc via 10, ehuyen dyng d|t dpc theo 16 dpc via thong gio. khu Tring Khe 11./.
- Giai phIp xO/ ly chly: Trpng q u i trinh khai Tai lieu tham khao:
thIc g mgt phin ting, khi sy e l chly xay ra, ein 1. Bio d o nghien cyu danh gil myc dp ty ehly nhanh chong xay tyong chan bang bao c i t hole cua than via 10 myc +30/+280, khu Tring Khe II - d i t set d i each ly khu vyc, tilp theo bgm khi nitg C6ng ty than Hong Thai v l de xult phygng an v i o d i dap ehly Tuy theo tinh trgng thyc t l cua cong nghe khai thac phii hgp (2015), Vipn Khoa gygng khau cflng nhy vj tri chly, c6 t i l l khong hpc Cong ngh| Mo.
khai thio g 16 dpc via phin t i n g xien cheo d l bj 2. Le Van Thao {2008),"Nghien cuv nguyin chly m l chuyin sang khai thIc 6' io dgc via nhan t^i cic via than va cac bien phip phong ngCra phan ting xien cheo k l tilp. trong qua trinh khai thic". de t l i khoa hpc
mrat.:^- KHCNM S 6 6/2tll6*CNKT HAM LO
