回采巷道过断层顶板破坏特征研究

Study on Roof Breaking Characteristics during Actual Mining Roadway Passing over Fault

通过相似材料模拟试验,建立平面应力模型,分析研究直接穿越断层时断层下盘巷道各点超前应力峰值点分布规律和断层上盘超前应力分布特征。试验表明:在断层上盘和下盘都存在一个最大超前应力峰值点;其顶板各点超前应力峰值点变化规律为下盘巷道各点最大超前应力峰值点先由开挖端逐渐增大,在靠近断层处达到最大值,然后再减小,直至断层破碎带;随着远离断层面,其超前应力先增大,再急剧减小,然后缓慢减小到正常掘进状态。

A plane stress model was set up through the simulation test of similar materials,and analysis and study were made on the distribution regularity of the advanced stress peak point at each place of the lying side of fault while a roadway directly passing through the fault and the distribution characteristics of advanced stress on the hanging side.Tests indicated that an advanced stress peak point existed on both lying and hanging sides of the fault,the varying regularity of the advanced stress peak point at each place on the roof was that the maximum advanced stress peak point at each place of the hanging roadway first gradually increased from the excavation end,then reached the maximum value near the fault,and finally then reduced to the fractured zone of the fault.With the advanced stress peak point away from the fault plane,the advanced stress first increased,then sharply reduced and finally slowly reduced to the normal state for drivage.