©• Thong tin khoa hpc c6ng ngh$ m6 NGUYEN TfiC THfiO KHI TRONG LO CHU^N Bl TAI KHU Virc VIA THAN CO NGUY HIEM VE KHJ VA PHUT K H I The paper represents some fundamental principles on tha gas drainage[.]
©• Thong tin khoa hpc c6ng ngh$ m6 NGUYEN TfiC THfiO KHI TRONG LO CHU^N Bl TAI KHU Virc VIA THAN CO NGUY HIEM VE KHJ VA PHUT K H I The paper represents some fundamental principles on tha gas drainage works for ensunng the safety when executing the dnfts at the areas having dangers of gas and gas outburst GS.TSKH MInheev S.P Viin Co hoc Bia ky thuit Vlin hin lim Khoa hgc Qudc gia Ukraina TS Le OI>C NGUYEN ThS DINH VAN CUONO Viin Khoa hoc Cdng nghi Md - Vinacomin ll/l&dau Nhung ndm gdn ddy, (Sa cd la khi, mdt s i trudng hep eg t h l , ngud'i ta se khdng tien hdnh edng tdc thdo khi xult cdng trinh thi cdng nhd hen gid trj thilt k l vd cac phueng tidn thing gid dam bao pha loang lueng mdtan den ty Id cho phdp Tuy nhidn, dieu ndy khdng duec dp dgng cde trud'ng hep thuc hidn thdo nhim: giam nggy ce phgt khi, md' ring khu vyc an todn xung quanh cdng trinh, ngan ngya sy rd n vd xult dgt ngpt cua eac 'id phun khr (fumaron), loai tn> sy tich tg cgc bd metan d' edc khe nui tach ldp khil dd bao quanh cdng trinh ngim Cdc phuang in thio a) Khi thl cdng cdc cdng trinh gilng dung, vide thao duec thyc hipn bing cac lo khoan duec khoan tCr be mjt dja hinh hole tu cae kham chuyen dgng than gilng (hinh 1) Cae Id khoan thudng dup'c b i tri song song vdl cdng trinh va cdch cdng trinh Thong tin khoa hoc cong nghe m o - via than: - Ting dit dd chO^ khi; - Ld khoan thdo khi; - Ong thodt khi; - Khdm ehuydn dung Hinh Sa dd thdo tmng thi cdng giing dUng a) Via ddc thodi din nghidng b) Via ddc dUng Hinh Sa dd phdn bd edc l5 khoan thdo khi md via cho cdc via than cd nguy co vi phut 2,5^3m, khoang each giOa cac hu'd'ng hifiu qua cac Id khoan Id khoan {hogc cac kham dup'c mac djnh bang 0,75m [2]; khoan) khoang 4-5m, phgm vi khoang each tit be mat khu vi^c tiin trudc cua lo khoan so vd'i ehua din guang ddo eua guang dao cua gieng khdng edng trinh {theo phuang vudng gdc) khong nhd han 2m [2]; nhd han 10m [1,3] Du-ang kinh eua lo khoan khoang each tu phan xa nhit cua eae Id khoan din bien giai phuc vu thao khi ma vfa bang gilng dung cho cac via du kien eua gilng, tinh theo than cd nguy hiem ve phgt phuang ngang khdng Id'n han ed the len td'i 80mm Cac Id 1,5m [3,6] Cdng tdc thao khoan thdo dup'c b l tri nhu dup'c coi la hifiu qua dp suat sa hinh 2, cho: cac lo khoan quan trac khoang each giua Id khoan tgi dgt gia trj nho han MPa phan b l Mat khu vuc xac d\nh chua khdng lan han 2Rhq, dd Rhq la ban kinh anh b) Khi guang thi eong cua gilng giao cdt vd'i via than doc nghieng hogc d i e dung, cac Id w Hinh Sa dd phdn b6 cde Id khoan thdo khi thi cdng giing giao cit vfa ddc khoan thao dug-c khoan theo via vdi dud'ng kinh tu 200 •=• 500mm, nhu sa d l t h l hifin hinh e) Khi thi cdng eae Id xuyfin via qua khu vuc chua n l , cdng tac thao cung dup'c thuc hifin bang eac Id khoan dup'c khoan tu guang Id hodc tu cac khdm dud'ng Id (hinh 4) Cdng tdc khoan thdo phai duae tiin hanh khoang each tu guang Id dang dao td'i khu vue ehua Idn han 5m Bifin gidi viJng thao khdng nho han hai lan chilu rdng dudng Id dup'c thi eong d) Khi thi cdng eac Id dgc via da vdi khoang each d i n via than nhd han 10m, d l ngan ngira eac nguy ea tang xuat va phgt b i t ngd vao dudng Id dang thi edng, khuyin nghj tien hanh khoan eac Id khoan thao nhu sa hinh Theo dd, eae Id khoan thao dup'c khoan tu Id ve phia via than va hudng v l phia trudc guang Id vdi khoang each tiin trudc so vdi guang Id khdng nhd han 10m, chieu dai mdi Id khoan 100m -^ 150m Khoang each giua eae id khoan 10 •*- 15m KHCNM S 12/2012 * AN TOAN MO Thong tin khoa hpc cong nghg m B-E cac l5 khoan tao vdi tnjc edng trinh m i t gdc (p = 15°+20° e) Khi thl cing Id dpc via than, cing tdc thdo duec thye hidn bing cdc l l khoan biin, duec khoan tCr cdc khdm d hing Id nhu hinh Cdc l l khoan t^o vdl trgc cing trinh mdt gdc 3° * 5°, chilg ddi l l khoan 100 * 150m, khodng cdch glj/a cdc khdm 40m * 65m Midng l i khoan b i tri edeh hing Id mdt khodng tCr 2,5m * 3m Trong tnrdng hep bdn canh Id dpc via than tin tai hodc dang thi eing tlln tnrdc mpt Id dpc via dd, nim each via A-A than mdt khodng khing ldn hen 30m, vide thdo phge vg thi cdng id dpc via than ndn duec thye hidn bing cdc Id khoan tir id dpe via da, duec khoan vudng gic vdi dudng phucng cua via (hinh 7) g) Khi thl cing e|p dudng Id song song viJng ehua n l , eae |5 khoan thdo phai duec khoan tu ea hai dudng Id Trong tnrdng hep dd, niu mdt hai guang Id thi cing t i n trude vd chilu ring tnj bao vd a) Thi cdng Id dpc via dudi via than: b) Thi cdng Id doc via trin via than;giira hai dudng l i nho hon 15m, thi tai dudng Id ndy tlln 1- Ld doc via: 2- Ld khoan: 3- Via than hanh khoan thao v l ea hai Hinh Cic sa dd thio khi thl cdng Id doc via di bdn hdng dydng Id, cdn t^i A dudng l i cdn 1^1 thudng chi t i i n hdnh khoan v l phia hdng l i hudng ngodi (hinh 8) Bang t h l hi#n mii tuong quan giO'a chilu day via, vj tri cua Id dpe via vdi vj tri, s6 lueng cde l6 khoan bidn phge vy cing tdc thdo tien tnrdc h) B l gidm d i chO'a cOa Id che l*ai thac via than chya khi, c i n su' dgng mdt khii lyeng khd Idn cac |5 khoan 1- Ld doc via: 2- Khim chuyin dyng; 3- Ld khoan; 4- Ong thoit thdo sa bp hoac thdo Hinh So dd thio khi thi cdng dudng Id via than 1- Via than 2- Ld xuyin via: 3- Ld khoan: 4- 6ng thoit khi: 5- Khim chuyin dung Hinh So dS thio cdc khil chira khi dio Id xuyin via KHCNM S6 12/2012 * AN TOAN M Thong tin khoa hoc c6ng nghe m o 1- Ld doc via da: 2- Lo khoan g§n true cong trinh 3- Ld khoan ben tren cong trinh di/kiSn, 4- Ong d^n 5- Ld doc via tiong liian l-iinh So 66 thao via doc bSng c^c lo khoan duac khoan 10' Id doc via Iroiig da 1- Via than; 2- BwOng Id, 3- Cup ndi, 4- Ld khoan thdo Hinh Sa dd thao khi thi cdng cdp dirdng Id song song Bang Vi trf va sd lugng cdc Id khoan bidn Vi tri cdng trtnh Theo sudn cdng trinh Tai nin cdng Irlnh Ill So lu'g'ng Id khoan Chieu day via, m 6.8 Tai phdn tren cua via 6-8 Tai phdn giua 6-8 Tai phdn d u d i cua via 4-6 Tai phan tren ciJa via 4-6 Tai phan dutyi cua via - 2-4 Tai via