土体强度参数对边坡隧道影响数值模拟分析

Numerical Stimulation Analysis for the Effects of Soil Mass Strength Parameters on the Tunnels with Side Slopes

为研究土体强度参数对边坡隧道的影响,采用数值模拟软件ABAQUS,建立了二维平面应变模型,对比分析不同土体粘聚力和内摩擦角对边坡隧道的影响。结果表明:粘聚力和内摩擦角取值较小时,开挖会使边坡产生较大位移;当二者增大一定程度后,边坡坡面最大位移变化量缩小,变化幅度在合理范围内;若继续增大,计算结果无显著变化,对边坡隧道不产生较大扰动。可见,土体强度参数是影响边坡隧道可靠性的主要因素。

To study the influence of soil mass strength parameters on tunnels with side slopes ,a two-dimensional plane strain model was established by using the finite element software ABAQUS .The effects of different cohesion and internal friction angles on the tunnel were analysed .The results showed that as the value of the cohesion and internal friction angle became smaller ,slope excavation would lead to a larger displacement ;when they increased to a certain extent ,the increasing amount of maximum slope displacement would reduce to a reasonable limit ;when the two continued to increase ,the results had no significant change ,i .e .,obvious disturbance to the tunnel did not occur .Therefore ,the soil mass strength parameters are the main factors affecting the reliability of the tunnels with side slopes .