露天矿岩体力学参数对终了边坡稳定性影响敏感性数值模拟

Numerical simulation on sensitivity of mechanical parameters of open-pit slope rock mass to final slope stability

为研究岩体力学参数对终了边坡稳定性的影响,以云南某露天矿边坡为研究对象,采集岩样展开室内岩石力学试验,通过Hoek-Brown强度准则折减计算岩体力学参数,运用Midas GTS NX建立三维边坡模型,通过FLAC3D软件研究岩体的弹性模量、泊松比、凝聚力、内摩擦角以及抗拉强度等参数对露天矿终了边坡稳定性的影响,以此分析出岩体力学参数对露天矿终了边坡稳定性影响的敏感性。结果表明,岩体力学参数中凝聚力与内摩擦角在影响露天矿终了边坡稳定性中所占比重较大,弹性模量、泊松比和抗拉强度影响较小。研究结果为后续边坡稳定性研究提供了依据,同时对边坡灾害治理与预防有一定的指导意义。

To study the influence of mechanical parameters of slope rock mass on the stability of the final slope,an open-pit mine slope in Yunnan province was taken as the research object.Rock samples were collected to carry out indoor rock mechanics experiments.The mechanical parameters of rock mass were calculated by Hoek-Brown strength criterion reduction.The three-dimensional slope model was established by Midas GTS NX.The influence of elastic modulus,Poisson′s ratio,cohesion,internal friction angle,and tensile strength of rock mass on the stability of the final slope of an open-pit mine was studied by FLAC3D software,to analyze the sensitivity of mechanical parameters of rock mass on the stability of final slope of the open-pit mine.The results show that the cohesion and internal friction angle of rock mass mechanical parameters accounts for a large proportion of the stability of open pit end slope,and the elastic modulus,Poisson′s ratio,and tensile strength of rock mass have little effect on the stability of open pit end slope.The research results provide a basis for subsequent slope stability research and have guiding significance for slope disaster management and prevention.