大倾角大采高工作面底板破坏滑移特征分析

基于目前大倾角煤层大采高开采的研究成果和工程实践,运用理论分析和数值模拟分析对大倾角大采高工作面底板破坏滑移特征进行了分析。研究结果表明,造成大倾角煤层底板破坏滑移的因素有内因和外因,其中主要原因是应力的"二次分布"。大采高工作面底板中下部应力释放的范围大于底板中上部应力释放范围;采高对底板破坏滑移具有一定的影响,即采高越大底板位移和应力变化越大;底板的破坏区分为拉应力破坏区、压应力破坏区和塑性破坏区3个区;描述了大倾角工作面底板破坏滑移的演变规律。

Analysis on Floor Failure and Slip Characteristics of Large Inclined and Height Face

Based on the current research achievements and engineering practice of large inclined seam,an analysis on floor failure and slip characteristics of large inclined and height face is carried out theoretically and by numerical simulation.The results show that both internal and external causes contribute to the floor failure and slip,and among them stress redistribution is the main account.The stress release scope in the lower floor of the face is larger the that in the higher floor.Mining height has certain influence on floor failure slip,that is the larger the mining height,the bigger the displacement and stress.Failure zone of the floor consists of tensile stress damage zone,compressive stress failure zone,and plastic zone,and describes evolution law of floor failure and slip of large-inclined face.