软岩厚度对层状顶板破坏特征影响分析

Analysis of influence of weak weak terrain thicknesses on feature of strata roof

顶板冒落是煤矿生产的五大灾害之一。顶板冒落主要与顶板岩层性质、赋存状态等因素有关,其中软弱岩层赋存的厚度变化是顶板冒落的主要原因之一。利用东北大学岩石破裂过程分析系统(RFPA2D),针对煤矿沉积岩层顶板破坏进行力学分析,并对赋存不同厚度软岩的层状顶板的破坏情况进行了数值计算。探讨了不同厚度的软弱岩层对巷道稳定性的影响,得出了不同厚度软弱岩层在巷道开挖后的破坏过程和最后冒落的形状,提出了对不同厚度软弱岩层的层状顶板巷道有针对性的支护措施。该结果对现场施工和试验具有重要的参考价值。

Roof collapse accidents, potentially in the association with lithology and occurrence of roof terrane etc., are termed to be one of the most severe calamities in the coal mine exploitation activities. The thickness of weak terrain as one of the most critical elements in roof collapse accidents is discussed in detail here. After carrying out the mechanics analysis for roof failure in coal mines employing rock failure process analysis system （RFPA^2D） developed by Northeast University, this paper conducts subsequently the numerical calculation for varying roof failure instances under different weak terrain thicknesses and probes into the impact of weak terrain thicknesses on laneway stability, concluding in the situation of different weak terrain thickness both failure processes after exploiting laneways and shapes formed ultimately by roof collapse. Roof supporting methods for weak terrain in different thicknesses are also listed finally. It is believed that conclusions from this paper are of significant reference not only to construction on site but also for experiments.