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岩体力学参数是边坡设计、边坡稳定性研究的基本条件,力学参数选取正确与否直接影响模拟结果的准确性。现场试验获取岩体力学参数既昂贵又费时,一般借助室内岩石力学试验并进行参数折减得到岩体力学参数,但各方法折减系数差异较大。依据毕机沟露天矿边坡开挖现状,结合工勘的岩石质量指标RQD,在室内岩石物理力学性质试验的基础上,应用拉格朗日有限差分法(FLAC-3D),分别研究单一参数变化及正交变化的边坡稳定性。正交试验中以边坡水平位移为评价指标,选择围岩体3个基本力学参数弹性模量E、内摩擦角Φ、黏聚力C为试验因素,计算模拟各参数不同水平组合下的位移分布,通过极差分析和方差分析,得出各参数对水平位移的影响显著性。结合边坡的应力分布,从而综合确定该矿山的岩体力学参数折减系数。
Mechanical parameters of rock mass are the basic conditions for slope design and slope stability study. Whether the mechanical parameters are correct or not will directly affect the accuracy of simulation results. Field tests to obtain mechanical parameters of rock mass are both expensive and time-consuming. The mechanical parameters of rock mass are usually obtained by indoor rock mechanics tests and the parameters are reduced. However, the reduction coefficient of each method is quite different. According to rock excavation status of Bijigou opencast mine and Lagrange finite difference method (FLAC-3D), combined with the rock quality index RQD of the geological survey, based on the laboratory physical and mechanical properties of rocks, the single parameters Slope Stability with Variation and Orthogonal Variation. In the orthogonal experiment, the horizontal displacement of the slope was taken as the evaluation index, the elastic modulus E, the internal friction angle Φ and the cohesion C of the three basic mechanical parameters of the surrounding rock mass were chosen as the experimental factors, and the displacement under different levels of the simulation parameters Distribution, through the range analysis and analysis of variance, the parameters of the horizontal displacement of the significant impact. Combined with the stress distribution of the slope, the reduction coefficient of mechanical parameters of the rock mass is comprehensively determined.