【摘要】 采动岩体裂隙演化规律的定量描述是岩石力学的重要课题之一。通过模拟支承压力对硬煤、软煤和中硬煤300 mm×300 mm×300 mm大煤样的压裂过程,运用分形几何理论研究了顶煤在支承压力峰值前后作用下裂隙的演化规律。研究结果表明,裂隙分维和支承压力具有良好的多项式定量关系。同时得出了基于损伤力学的顶煤压裂本构方程,为综放开采数值分析、工艺及参数选择提供了科学依据。更多还原

【Abstract】 Quantitative description for the evolution of crack in rock stratum is one of the fundamental problems of rock mechanics. Based on the field observation of the abutment pressure,the cracking process of top-coal is simulated. By using the fractal geometry,the evolution of crack is described quantitatively. It is found that the relation between the fractal dimension of crack and the abutment pressure is polynomial expression. According to the damage mechanics,the constitutive equations of the top-coal cracking is obtained.更多还原