Thong tin khoa hoc cong nghe m o / N G H I E N CUfU sur DUNG TRO XJ LAM VAT LIEU XAY DUNG CAC TRU DO ham lb de bao ve cac cong trinh tren be mat For maximally recovering natural resources and protecting the building constructions on the mine surface, the backfilling methods have been applied with various materials for filling the goafs created by coal mining operations This paper refers to the research results on the utilization of slag from coal-fired power plants, of which, many belonging to Vinacomin as the backfill materials in undergnyund coal mining for protecting the building constructions on the mine surface TS PHAM MINH D a c TS L E V A N C N G KS NGUYEN TRi THANG KS PHi V A N L O N G Vi$n Khoa hQC Cong ngh$ Mo - Vinacomin Bien tap: TS Pham Minh D&c Dat vdn 6& c6ng nghiep khai thac than phat trien tren the TO" tru-oc den nay, cong nghe khai thac gidi, da c6 rit nhiiu cong trinh nghien CLPU v i than bang ham 16 o Vi?t Nam, de dieu khien ap cong nghe chen 16, bao gim phuong phap, thiit Iyc mo, chung ta v i n su" dung bien phu'ong bi, vat lieu chen 16 va dac biet la phuong phap phap pha hoa toan phan Phu'ong phap co su dyng cac tru da nhan tao u-u diim: quy trinh cong nghe don gian, chi phi Bai bao tap trung nghien cuu su dyng vat khong nhieu Tuy nhien, vi$c ap dung phu'ong lieu la tro, xi cua cac nha may nhiet dien dot than phap se lam biin dang, tao syt lun tren mat d i xay dung cac try da, bao v? cac cong trinh dja hinh khu vi/c khai thac Tru'ong hop mu6n tren mat bao v$ cong trinh tren mat, nguoi ta phai dh lai K i t c i u tru do* bao.ve cac cong trinh tai nguyen iam tru bao v0 cho cac cong trinh nay, tren mat gay lang phi H? so an toan (SF- Safety factor)[10] cua try Nhu" vi dy d6i vol mo than IVIao Khe, theo ket do, bao ve cac cong trinh tren mat duoc xac qua nghien cu-u cua De tai "Nghien cu-u giai dinh theo mii quan he : phap cong nghe khai thac via day, doc canh D6 bin cua tru 3& Nam - Cong ty than Mao Khe", khu canh Nam SF= '• (1) Tai trpng cua try 3& mo Mao Khe [1] co tru- lu'ong than nim du-oi cac Trong do, SF la He s i an toan (Safety Factor) cong trinh, doi tu'ong c^n bao ve tren b§ mat Cac tac gia [10] da tiin hanh theo doi tai 125 (khong tinh triJ' lu'ong nam try bao ve cac phay pha, dirt gay, cong trinh gieng va san ga try than b i tri tai cac chiiu sau khac Cac try dd d i u an toan, khong bi pha huy gia gling) khoang 23,2 trieu tan, chiem % t6ng tru- lu'ong dja chat tinh den mu-c -400 Trong do, triSF>1,6 tru' lu'ong than nam du'O'i cac cong trinh du'ong Cac tac gia Salamon, Munro (1967); Srod day dl$n cao the chiem ty 10 59%, ho chu-a (1991) nghien cuu thuc nghiem xac dmh he s6 nu'dc, 14%, khu dan cu', 11%, moong lo thien cu, an toan SF Wagnera va Maddena (1984) da 7% va cac su6i, 9% Vi$c de lai tru- lu'ong than nghien cuu tren 10.000 try dd thiy rang chi c6 lam try bao ve se gay lang phi tai nguyen 15 try hay 0,0015 s i try bi pha huy Nhuvay, SF Ion va lam giam hieu qua dau tu" mo nam khoang tCr 1,5 -^ 1,8 Do b i n cua try dd phu thuoc vao sy thay doi D i t | n thu t6i da tai nguyen, dong thoi v l n bao ve du'oc cac cong trinh tren mat mo, ngu'di cua moi trudng su dyng, ve co ban bao ta thu'dng ap dung phuong phap chen 16, su" gom: dyng cac logi vat li#u khac d i chen lap khoang - Lfng suit khii vat li#u try dd, trong Idng dat khai thac than tao - Su thay doi trang thai ung suit cua try Tuy nhien, viec ap dyng chen 16 se lam tang anh hudng cua cong tac khai thac than gia khai thac TCr do, tai cac nu-dc co n i n via KHCNM S6 12/2014* CNKT HAM L Thong tin khoa hoc cong nghe m o Lf - Chieu dai cua tru dg, m Khau than bing thu cong, n§n hinh dang cac try dg khong vuong van, tai trgng cua tru dg dygc xac d|nh theo (5); 40 30 3 Tro CO tinh v6i Loai mau tro