【摘要】 根据材料损伤本构关系 ,用大煤样三维压裂实验和现场顶煤变形观测 ,求得损伤变量、损伤系数、煤体常数与煤体压裂强度的关系 ,以及损伤变量随工作面推进的变化关系 .实验所得损伤参数变化规律可信 ,损伤变量D随工作面的推进呈指数函数变化 ,这一规律对预测支承压力分布和顶煤冒放特性有重要意义 .更多还原

【Abstract】 According to material damage characteristic relation, the relation between the damage variation, damage coefficient,coal mass constant and the fracture strenth of coal mass and change relation of damage variation in advance process of working face are obtained by three dimension fracture test of big coal sample and top coal deformetion observe in working face. The conclusions show that the change law of damage parameters is reliable. Change of damage variation D is exponential function in advance process of working face. This law is importment significance to forecast abutment pressure distribution and top coal caving feature.更多还原