岩体结构面对边坡动力稳定影响的数值模拟研究

The Numerical Simulation Study on the Influence of Rock Structure Planes on the Dynamic Stability of Slope

为探索爆破振动作用下岩体结构面对边坡稳定的影响,以贵州省某露天矿爆破工程为背景,采用ANSYS/LSDYNA动力有限元软件分别建立含结构面和不含结构面的边坡爆破模型,对爆破振动作用下的边坡动力响应特征进行分析。数值模拟结果表明,地震波穿过结构面时,位于结构面前的边坡体上的质点振速发生明显的叠加放大。随着爆心距的增大,质点振速放大系数由1.05增加到1.61,而边坡单元的有效应力放大系数均小于1.10。结构面的存在,对结构面前质点的位移影响不大,其最大位移值仅为1.87mm。

In order to explore the influence of rock structure planes on the dynamic stability of slope under blasting vibration, and taking a blasting engineering in an open-pit mine of Guizhou as background, the slope blasting models with structure planes and without structure planes were built by the finite element software ANSYS/LS--DYNA. And then, the dynamic response properties of slope under blasting vibration were analyzed. The numerical simulation results indicated that, when a earthquake wave went through structure planes, the particle velocity on the slope in front of structure planes was amplified obviously. When the blasting center distance was increased, the amplification coefficients of particle velocity were increased from 1.05 to 1.61, whereas the amplification coefficients of effective stress about slope unit were all less than 1.10. Because of existing structure planes, the particle displacements in front of structure planes were not significant which maximum number was just 1.87 mm.