CAJ | 학술논문

以鹤壁四矿2606工作面沿空掘巷为工程研究背景,用 FLAC3 D模拟了煤柱宽度从5 m到15 m变化过程中巷道围岩的主应力差变化规律.结果表明,巷道顶板和回采侧帮主应力差随着围岩深度的增加先增大后减小,在围岩深部趋于定值,巷道顶板影响范围大于回采侧帮；采空侧煤柱主应力差极大值随着煤柱宽度的增大先增大后减小,而极大值位置逐步向巷道围岩深部转移.基于此,支护形式采用新型的斜拉锚索支护体系,具有双向施力、锚固点稳、变形闭锁等优点.矿压观测结果表明,两帮相对移近量为367 mm,顶底板移近量为275 mm,累计离层量为25 mm.
이학벽사광2606공작면연공굴항위공정연구배경,용 FLAC3 D모의료매주관도종5 m도15 m변화과정중항도위암적주응력차변화규률.결과표명,항도정판화회채측방주응력차수착위암심도적증가선증대후감소,재위암심부추우정치,항도정판영향범위대우회채측방；채공측매주주응력차겁대치수착매주관도적증대선증대후감소,이겁대치위치축보향항도위암심부전이.기우차,지호형식채용신형적사랍묘색지호체계,구유쌍향시력、묘고점은、변형폐쇄등우점.광압관측결과표명,량방상대이근량위367 mm,정저판이근량위275 mm,루계리층량위25 mm.
Taking the gobGside entry driving in No.2606 working face in Hebi No.4 Coal Mine as the engineering background,the paper uses FLAC3D to simulate the change law of principal stress difference of roadway surrounding rock with the coal pillar width changing from 5 m to 1 5 m.Results show that the principal stress difference in the roadway roof and mining sides increaG ses at first then decreases with the increase of surrounding rock depth,and it tends to be fixed value in the deep surrounding rock at last;the influenced range in the roadway roof is greater than the mining sides;the maximum principal stress difference of gobGside coal pillar increases at first then decreases with the increase of coal pillar width,and the maximum value position graduG ally transfers to the deep surrounding rock in roadway.Based on these,the new stayedGcable supG port system is adopted,which has the advantages of bidirectional force application,stable anG chorage point and deformation lockout etc.The strataGcontrol observation result indicates that the relative twoGsides convergence is 367mm,roofGtoGfloor convergence is 275mm,and the cumulaG tive bed separation is 25mm.