CAJ | 학술논문

当煤层顶板中存在1层或者数层坚硬岩层时，随着工作面采高的增加，侧向岩层应力集中范围增大，导致护巷煤柱宽度增大。为了减小护巷煤柱宽度，提出顶板切缝减小护巷煤柱宽度的技术原理。采用相似模拟和数值模拟实验，对巷旁顶板不同切缝深度的岩层应力传递控制作用进行了系统的研究，揭示了切缝深度对岩层破裂和顶板下沉的影响。结果表明：随着切缝深度的增加，煤柱上方岩层应力逐渐减小，层位越高，应力越小；工作面侧向采空区顶板下沉量增大，采空区岩层应力逐渐增加，层位越高，应力越大；煤柱上方10，20 m岩层应力峰值、峰值点距切缝边缘距离与切缝深度呈非线性反比关系；采空区上方10，20 m岩层应力与切缝深度呈指数关系，说明深度切缝可以有效控制岩层应力分布、应力峰值及峰值点距切缝边缘的距离。
당매층정판중존재1층혹자수층견경암층시，수착공작면채고적증가，측향암층응력집중범위증대，도치호항매주관도증대。위료감소호항매주관도，제출정판절봉감소호항매주관도적기술원리。채용상사모의화수치모의실험，대항방정판불동절봉심도적암층응력전체공제작용진행료계통적연구，게시료절봉심도대암층파렬화정판하침적영향。결과표명：수착절봉심도적증가，매주상방암층응력축점감소，층위월고，응력월소；공작면측향채공구정판하침량증대，채공구암층응력축점증가，층위월고，응력월대；매주상방10，20 m암층응력봉치、봉치점거절봉변연거리여절봉심도정비선성반비관계；채공구상방10，20 m암층응력여절봉심도정지수관계，설명심도절봉가이유효공제암층응력분포、응력봉치급봉치점거절봉변연적거리。
When there is a layer or several layers of hard rock seam roof, the stress concentration in lateral rock increases with increase of mining height, which leads to the widening of the roadway coal pillars. In order to reduce the width of the roadway coal pillars, a technological principle of cutting dif-ferent depth fracture along roadway in roof is proposed. A systematic study of the surrounding rock stress transfer and control is conducted through similar simulation and numerical simulation when road-side roof has been cut at different depth. The impact of cutting fracture depth on strata breakage and roof sinking is revealed. The results show that:with the increase of kerf depth, the rock stress of goaf decreases gradually;the higher the rock strata is, the smaller the stress is. With the increase of cutting fracture height of the lateral goaf roof, the rock stress above the coal pillars increases gradually; the higher the rock strata is, the bigger the stress becomes. The rock stress above the coal pillars(10 m and 20 m) and the distance from peak stress to cutting fracture edge are in nonlinear inverse relationship with cutting depth. While the strata stress at 10 m and 20 m above the goaf shows an exponential rela-tionship with cutting depth. It means that the deep cutting can effectively control the distribution of strata stress, stress maximum and the distance of peak point from the edge of cutting fracture.