基于FLAC^(3D)的边坡稳定性分析及治理模拟

STABILITY ANALYSIS AND TREATMENT SIMULATION OF LEFT IMPORT SLOPE OF BAINIAOPO TUNNEL IN GUIYANG-DUYUN HIGHWAY

在现场考察和工程地质勘察的基础上,详细分析了贵匀高速公路百鸟坡隧道左线进口边坡的工程地质条件及其变形特征,认为在暴雨条件下,坡体的覆盖土层与部分强风化层沿强弱风化基岩接触面附近产生滑动而发生坍塌,将隧道左洞掩埋;该边坡破坏机制属牵引式破坏;根据规范及有关经验对边坡力学参数取值,用FLAC^(3D)有限差分技术,建立边坡地质力学模型,计算暴雨条件下边坡的稳定性。结果表明:在暴雨条件下边坡处于不稳定状态,需进行治理。本文通过设计抗滑桩、钢管桩及挡土墙等措施对边坡进行支护并验证该边坡处于稳定状态,为贵匀公路的顺利完成提供了有力保障。

Based on the engineering geological exploration and site investigation,detailed analyze the engineering geological conditions and deformation characteristics of the left im-port slope of bainiaopo tunnel in Guiyang-Duyun Highway.In this paper,the author con-cludes that the cover soil and portal strong weathering layer of the slope mass slides along the interlayer between strong and weak weathering layer under condition of rainstorm,and it buries the left hole of tunnel.The deformation mechanism of the landslide is tractor-destruc-tion.According to some regulations and experince,the slope’s mechanical parameters is con-firmed.The geomechanical model is estabilshed by using FLAC3D of FED technology to cal-culate the slope stability under condition of rainstorm.The results indicate that the slope isn’t stable and needs to be treatmented.Some measures such as anti-slide pile,steel pipe pile,earth-retaining wall,and so on,are designed to support the slope and then make sure the slope is stable which provides an effective guarantee for the successful performance of Guiyang-Duyun Highway.