散体矸石力学参数标定与矸石山边坡稳定性分析
Calibration of mechanical parameters of granular gangue and stability analysis of gangue dump slope
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摘要: 以李家壕煤矿矸石山为例,对矸石山边坡稳定性问题进行了较为全面的研究。对于散体矸石无法直接制作成样测试力学强度参数的问题,借助模拟软件PFC3D对散体矸石的力学参数进行了反演,通过侧限压缩试验和三轴压缩模拟试验测得了散体矸石的抗剪强度参数;利用试验所得抗剪强度参数,用FLAC3D数值分析软件对李家壕煤矿矸石山边坡进行了整体的剪切塑性区分析,得出潜在剪切破坏区域对工业广场安全性基本无威胁;二维稳定性分析得到的安全系数在1.2左右,该计算结果表明该矸石山边坡整体暂时处于较为稳定的状态,根据位移云图确定防护区域应该集中在上部2个台阶位置,能够有效避免局部失稳。同时为了保证长期的稳定性,结合矸石山的特点,提出了相应有效的治理措施。Abstract: Taking the gangue dump of Lijiahao Coal Mine as an example, this paper makes a comprehensive study on the stability of the gangue dump slope. For the problem that granular gangue cannot be directly made into samples to test mechanical strength parameters, the mechanical parameters of granular gangue are inverted by simulation software PFC3D, and the shear strength parameters of granular gangue are obtained by lateral compression test and triaxial compression simulation test. Using the shear strength parameters obtained from the experiment, the stability of the gangue dump slope of Lijiahao Coal Mine is analyzed by FLAC3D numerical analysis software. The safety factor is around 1.2. The calculation results show that the slope of the gangue dump is in a relatively stable state temporarily. According to the displacement contour, the protection area should be concentrated in the upper two steps, which can effectively avoid local instability. At the same time, in order to ensure long-term stability, combined with the characteristics of gangue, the corresponding effective control measures are proposed.
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