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Thong tin khoa hoc cong nghe md p MO PHONG BIEN DOi C0 HOC KHI KHAI THAC VIA DAY DOC BANG HE THONG KHfll THnC CHin L6P NOnNG sir DUNG CHUONG TftlNH UDec GS TS NGUYEN QUANG PHiCH TS NGUYEN VAN MANH NCS[.]
Thong tin khoa hoc cong nghe m d p MO PHONG BIEN DOi C0 HOC KHI KHAI THAC VIA DAY DOC BANG HE THONG KHfll THnC CHin L6P NOnNG sir DUNG CHUONG TftlNH UDec GS TS NGUYEN QUANG PHiCH The Universal Distinct Element Code (UDEC) is a two-dimensional TS NGUYEN VAN MANH numerical software that simulates the quasi-static or dynamic response NCS PHAM VAN CHUNG to loading of media containing multiple, intersecting joint structures In Trw&ng Dai hoc Md - Dja chit this paper, the authors refer to the simulation of the geomechanical KS AN X U A N TRU'dNG KS HG6 V A N GIAP processes when exploiting the inclined and thick coal seams by Cdng ty than Mao Khd horizontal slicing mining method with UDEC program Bidn tdp: TS Ph^m Minh DCrc Md ddu ca hgc cua cdc m l i lien k i t gida cdc phan td rdi Trong khai thac md, cdc mat phdn cdch (mat rac, cac khdi ndt phdn Idp, phdn philn, cdc khe ndt, ddt gay ) Viec md hinh hod cdc bilu hien ca hgc cua ludn gid vj tri quan trgng doi vdi qud trinh djch svat lieu ran v i n dygc xay dyng tren ca sd cac ddng vd phd huy Sy ton tai cua cac mat phdn kit qua thyc nghiem dygc tiln hdnh d cdc mdu cdch cd anh hydng rat Idn d i n cdc tinh chit ca dd vdi cdc md hinh lyu biln da dang, cd chu y hgc cua khIi da: cac bieu hien ca hgc cua khIi d i n tinh hod cdng, giam b i n theo biln dang, da mang dau hieu khdng lien tyc, khdng dong Khi md hinh hod bilu hien ca hgc cua cac nhit, dj hydng vd phy thudc nhilu vdo kich mat phdn cdch ton tgi hai quan dilm Id: coi tilp thydc cua chung [1] xuc gida cdc phdn td Id mem hay cdng Trong Trong thyc t l , d l cd t h i phdn tich, nhdn djnh phyang phap phan t d hdu han, sai phdn hdu sy on djnh ca hgc cua khoi dd chung ta d n thilt hgn, phan td bien thydng sd dung cdc phan td phai hilu bilt v l cac trang thai dng suit vd quy khe ndt, dydng trygt vdi bieu hien nhit dinh luat bien dang, djch chuyen khoi dd sau chya phan dnh hit dygc dac dilm cua cdc mli khai ddo D l giai quylt v i n 6h ndy, d i n nay, tilp xuc, lien kit phdc tap vd tinh todn chi phan Idn v i n sd dung cdc phyang phdp tinh ddng lai d biln dang vd chuyin ddng quay nho toan theo ly thuylt ca hgc cdc mdi trydng lien Cdc chyang trinh phan t d rdi rac (discrete eletyc, k l ca phyang phdp giai tich vd phyang ment) cho phep chu y dygc cdc chuyen dgng phdp so Dyang nhien, thycte da chdng td rang, quay biln dgng cua cdc vj tri tilp xuc, lien kit khoi da thyc sy Id tap hgp td cdc khoi ndt vd ty ddng nhdn bilt dygc cdc vj tri tilp xuc mdi vdi nhdng mli lien kit phdc tap gida chung thi qud trinh tinh todn cdc ldi giai theo ca hgc mdi trydng lien tuc tham Trong phygng phdp phan t d rdi rac hinh chi cung khdng cho kit qua djnh tinh hgp ly Mgt thdnh bin nhdm phyang phdp vdi cac dac tryng loat cdc phyang phdp s l da dygc phat triln sau: nham tiem can v i n d l ndy • Cdc chyang trinh phan t d rieng re (distinct Ndi chung, muon chu y dac dilm cua khoi da element programs) sd dung sa tinh tydng ndt ne, mgi md hinh s l ndi chung phai phan anh minh cho thdi gian 6k giai tryc tilp cdc phyang dygc hai loai bilu hien eg hgc he thing trinh chuyin dgng Cdc khIi ndt dygc xem Id khdng lien tuc: cdng hay cd the biln dang, bang each chia • Bieu hien cua y l u t l gay tinh khdng lien thdnh cac phan t d hdu han Cac vj tri tilp xuc tyc; md phdng cd t h i biln dang dygc Cac chygng • Bilu hign cua cac phan t d vat lieu ran trinh dai dien Id: TRUBAL (Cundall and Strack, Nhy vay md hinh phai vda chu y dygc cac 1979) 121, UDEC (Cudall, 1980) /3/; Cundall and bilu hien cua cac phin td ca ban d u thdnh khIi Hart 1985) /4/, 3DEC (Cudall, 1988; Hart et al., da Id da vd dong thdi phai chu y dygc bilu hien 1988) /5/, DIBS (Walton 1980) /6/; 3DSHEAR KHCNM S6 8/2014 * CNKT HAM LO Thong tin khoa hpc cong nghe mo 0/Valton et,ar., 1988) /7/vd PFC (Itasca, 1995) 181; thac via ddy ddc bdng he thdng chia Idp • Cdc phyang phdp t h i thdc (modal meth- ngang ods) tyang ty nhy phyang phdp phan td rieng Vi du dygc trinh bdy d ddy lien quan vdi he re md phdng vj tri t i l p xuc Id cdng, nhyng vdi thing khai thdc chia Idp ngang mdt thdn quang cdc phan td biln dgng thi sd dung nguyen li x i p ddy 50m Moi khoanh khai thdc cao 22m, dygc chong theo t h i thdc 0/Villiams and Mustoe, 1987) khai thdc chia ldm Idp Mdi Idp khai thac cd 191 Phyang phdp ndy cd t h i thich hgp han cho chilu ddy 6m vd gida cdc Idp cd Idp dem dygc mdi trydng khdng lien tuc d u thdnh td cac vat d l lai khai thdc Idp dydi, cd chilu ddy Id 2m t h i rdi, khdng lien kit Mdt chyang trinh dgi Mien khao sat cd chilu rdng 170m, cao 100m dien Id CICE (Hocking et al., 1985) /10/; dygc t h i hien tren hinh KhIi da bao gdm than • Phyang phap phdn tich biln dang khdng qugng, cdc Idp da phu, vach vd try, vdi cac tinh lien tyc (Discontinuous Deformation Analysis) chit ca hgc dygc tong hgp nhy bang cho rang cac vj tri tilp xuc cd bieu hien cdng, KhIi dd bj chia cat bdi hai he khe ndt chinh, cdn cdc phan td Id cdng hoac biln dang dygc vdi gdc d m 0° vd 90°, nhien, cdc he ndy cd Dilu kien khdng xdm nhap dygc thyc hien theo mat khac mdi logi dd He khe ndt sa tinh lap; tinh biln dgng dygc chu y theo chu dao cd gdc cam 0° cd chieu ddi xuyen suit nguyen ly x I p chong Chyang trinh quan trgng khIi dd He khe ndt thd 2, vdi gdc cam 90° c6 hien Id DDA (Shi, 1989) /11/; chilu ddi hdu han, phdn b l d i u tdng vung • Phyang phdp trao ddi ddng lygng (MomenT ; : tum-Exchange methods) coi ca vj tri tilp xuc vd Lap da phii cac phdn td d i u Id cdng, ddng lygng dygc trao doi gida hai phan td t i l p xuc va dap A tryc tilp Topgt cd ma sdt dygc chu y d i n (Hahn, 1988)/12/ 6St^ Than Da vach Trong bdi ndy, gidi thieu mdt kit qua phdn tich qujng cdc qud trinh djch ddng, phd huy khIi da vdi chyang trinh UDEC (Universal Distinct Ele1, l,,.J_:.^-;_, ment Code) cho bdi todn md phdng khai thdc via quang ddy, d i e nam sau vd ndng gan mat dat :iii Quy luat b i l n d i i dja co* hoc khai Hinh Hinh dnh phdc hoa midn nghidn cwu Bdng Cdc tham sd ca hqc cOa cdc loai dd Da Mat ddp, Md dun nen the kg/m^ tich K, GPa Mddun tripgt GPa Ldp dd phu Dd vdch 2450 2500 6,0 4,0 4,5 3,5 Thdn qudng Ddtrg 1440 2450 2,6 1,7 3,0 3,0 Lire dinh kite, MPa 4,0 3,5 2,4 4,0 Gdc ma Do ben keo OK, sat