某工程岩质边坡支护方案数值模拟分析

Numerical Simulation Analysis of the Support Scheme for a Rock Slope Engineering

以某工程岩质边坡为研究对象,基于Midas/GTS有限元软件研究了重力式挡墙法、全长粘结型锚杆支护法以及预应力锚杆法三种方案下的边坡稳定性。结果表明:初始状态边坡存在潜在的圆弧状的表层滑动带,最大塑性应变值为4.97×10~(-2),位于强风化石灰岩夹板岩与中风化石灰岩夹板岩交界处;最大水平位移值为42.02mm,初始稳定性系数为1.08。三种支护方案下边坡最大塑性应变值分别减小至6.70×10~(-3)、1.07×10~(-3)、2.73×10~(-4),最大水平位移分别减小至25.40mm、10.72mm、2.56mm,稳定性系数分别增至1.16、1.36、1.58。模拟结果表明预应力锚杆支护方案对边坡整体稳定性的提升最为明显,预应力锚杆支护为最优方案。

Taking the rock slope of a project as the research object,based on the Midas/GTS finite element software,the stability of the slope under the three schemes of the gravity retaining wall method,the full-length bonded anchor support method and the prestressed anchor method.The results show that there is a potential arc-shaped surface sliding zone at the initial state slope,the maximum plastic strain value is 4.97×10-2,which is located at the junction of strongly weathered limestone interbedded slate and mid-weathered limestone interbedded slate;the maximum horizontal displacement value is 42.02 mm,the initial stability factor is 1.08.Under the three support schemes,the maximum plastic strain values of the slope were reduced to 6.70×10-3、1.07×10-3、2.73×10-4,and the maximum horizontal displacements were reduced to 25.40mm,10.72mm,and 2.56mm,respectively,and the stability coefficients were Increased to 1.16,1.36,1.58.The simulation results show that prestressed anchor supporting scheme has the most obvious improvement on the slope overall stability,and the prestressed anchor supporting is the optimal scheme.