采高对工作面及围岩应力壳的力学特征影响

以谢桥矿1151(3)综放工作面工程地质和开采技术条件为背景，应用实验室相似材料模拟和计算机数值模拟（FLAC3D），对不同煤层厚度采场围岩应力分布规律进行系统的分析和研究，获得了采场围岩宏观应力壳力学特点和变化规律，即随开采煤厚的增大，应力壳的几何高度增加，壳基应力降低，分布范围增大且离工作面煤壁越远；揭示了煤层厚度对该力学特征的影响和综放与综采工作面及围岩宏观应力壳力学特征的差异，也正是综放工作面矿压显现不同于综采工作面的根本所在. 表明合理调整开采厚度和采场结构可改善采场围岩宏观应力壳的动态平衡，对保护工作面、减小矿山压力影响和显现有积极作用.

Influence of mining thickness on mechanical characteristics of working face and surrounding rock stress shell

Numerical simulation-FLAC~(3D) and equivalent material simulation were carried out to analyze the distribution of surrounding rock stress with different thick coal seams based on engineering geology and exploitation technology of 1151(3) fully mechanized top-coal caving(FMTC) face in Xieqiao colliery.Mechanical characteristics and variation laws of surrounding rock stress shell were put forward.The height of stress shell increase with the increase of mining thickness.Coal seam is thicker,the stress of skewback is smaller, distribution range is wider and farther to wall.Influence of mining thickness on mechanical characteristics and the difference between fully mechanized top-coal caving and fully mechanized winning were demonstrated.This is the basic reason that strata bebaviors in FMTC face are different from those in fully mechanized winning face.Reasonably adjusting mining thickness and working face structure can improve dynamic balance of surrounding rock stress shell.It plays a positive role in protecting working face and reducing rock pressure influence.