CAJ | 학술논문

选取某煤矿近距离煤层为工程背景，采用FLAC3D模拟了8#煤层残余煤柱底板偏应力场分布特征。结果表明：（1）底板的偏应力呈扩散状向底板传递，距离煤柱越远扩散范围越广，煤柱边缘偏应力呈45°向底板传播；（2）煤柱较窄时，中线和边缘处偏应力影响深度浅，随煤柱宽度增加，底板偏应力变化和影响深度较大，当煤柱宽度足够大时，影响深度又变浅，中部趋于原岩应力；（3）同一水平面上，偏应力呈马鞍状分布，随煤柱宽度增加，煤柱中线处和边缘处偏应力经历了先增大后减小的过程，煤柱边缘处偏应力峰值位置变化不大；（4）同一煤柱宽度，煤柱边缘偏应力峰值向深部递减且趋势减慢，同时，峰值远离煤柱且趋势加快。在自由边界受均布载荷、底板垂直应力、水平应力、切应力解析解的基础上，推导了底板偏应力解析公式，解析与模拟结果基本吻合。具体到该工程的地质条件，9205轨道巷距离煤柱边缘20 m、9205回风巷在煤柱边缘、9205运输巷在煤柱中线处，9205轨道巷维护效果最好，证明了内错式巷道且距离煤柱足够远时，偏应力较小，宏观应力环境更适合巷道围岩自稳。
선취모매광근거리매층위공정배경，채용FLAC3D모의료8#매층잔여매주저판편응력장분포특정。결과표명：（1）저판적편응력정확산상향저판전체，거리매주월원확산범위월엄，매주변연편응력정45°향저판전파；（2）매주교착시，중선화변연처편응력영향심도천，수매주관도증가，저판편응력변화화영향심도교대，당매주관도족구대시，영향심도우변천，중부추우원암응력；（3）동일수평면상，편응력정마안상분포，수매주관도증가，매주중선처화변연처편응력경력료선증대후감소적과정，매주변연처편응력봉치위치변화불대；（4）동일매주관도，매주변연편응력봉치향심부체감차추세감만，동시，봉치원리매주차추세가쾌。재자유변계수균포재하、저판수직응력、수평응력、절응력해석해적기출상，추도료저판편응력해석공식，해석여모의결과기본문합。구체도해공정적지질조건，9205궤도항거리매주변연20 m、9205회풍항재매주변연、9205운수항재매주중선처，9205궤도항유호효과최호，증명료내착식항도차거리매주족구원시，편응력교소，굉관응력배경경괄합항도위암자은。
A close distance coal seams in a coal mine is selected as a case. Deviatoric stress distribution under coal abandon pillars #8 is simulated with FLAC3D. Research results are as follows: (1) Deviatoric stress field in floor distributes as diffusion, the farther the distance is, the wider the range spreads; it transfers from border to floor in 45o direction; (2) When the width of pillar is narrow, the deviatoric stress influence depth at midline and border is shallow; with the width increasing; deviatoric stress at floor varies obviously and the influence depth is deeper; when the coal pillar width is wide enough, middle part is as stress of primary rock; (3) In the same horizontal plane, deviatoric stresses are distributed as saddle shape, with pillar width increasing, the pillar midline and border increase at first and then decrease; and the position of deviatoric stress peak at coal pillar border has little change; (4) as to a certain coal pillar width, deviatoric stress peak at border decreases in vertical direction and its tendency is slower; meanwhile, the peak is far away from coal pillar quickly and its tendency gets faster. Through vertical stress, horizontal stress and shear stress analytical solution, afloor deviatoric stress analytic formula is derived; the analytic solution is consistent with the simulated result. In this case, track roadway 9205 has a 20 m distance from coal pillar border (inboard-type); return airway 9205 is located in coal pillar border; transportation roadway 9205 is located in coal pillar midline, track roadway 9205 maintenance effect is the best of them, which proves that the inboard-type layout roadway with an enough distance from coal pillar bears a little deviatoric stress. Macrostress field is more suitable to the roadway surrounding rock self-stabilization.