深部长壁开采采动应力壳演化模型构建与分析

Modeling and analyzing on the development of mining induced stress shell in deep longwall mining

结合走向长壁开采特点及深部开采采动应力壳演化和采动裂隙发育特征,构建了采动应力壳演化的三维分析模型,引入移动坐标系统和椭球面方程,获得了非充分采动条件下首采工作面和护巷煤柱宽度影响下采动应力壳演化形态方程和采动裂隙发育范围。基于影响采动应力壳演化和采动裂隙发育特征的因素分析,获得了采动应力壳壳体演化形态方程和采动裂隙发育各参量间的关系。分析表明,采动应力壳演化最易在煤柱侧壳基、壳肩或壳顶发生失稳,其演化失稳模式主要有压缩失稳模式、拉伸失稳模式、剪切失稳模式和复合失稳模式,整体揭示了采动应力壳演化特征及其与采动裂隙发育的动态效应。

Based on the characteristics of longwall mining along the strike and mining induced stress shell（MISS） mining induced fracture（MIF） developing,the three-dimension analyzing model of MISS was built with moving coordinate system.By introducing the ellipsoid equation,advancing configuration equations of MISS were obtained under the conditions of subcritical extraction and effected by coal pillar width.The relations among influenced factors during MISS-MIF developing were gained by analyzing factors affected on development characteristics of MISS-MIF.The results show that the MISS unbalancing will easily happen at MISS base side of coal pillar,MISS shoulder or MISS roof.And the unbalancing patterns of MISS developing include mainly compressive instability,tensile instability,shear instability or composite instabilities.MISS development characteristics and the dynamic effect of MISS on MIF development are open out with comprehensive investigation.