改扩建高速公路路堑边坡拓宽方案对比分析

对广西柳南高速公路改扩建边坡工程的实际地质情况进行了调研分析, 提出了台阶型截面开挖和抗滑桩+锚索预加固开挖两种边坡拓宽施工方案。利用FLAC^3D软件对两种方案加固效果进行了数值模拟对比分析, 并且综合工程其它因素提出了合理的施工方案。结果表明: 两种方案加固边坡后边坡安全系数和坡顶的竖向位移沉降都能满足规范要求, 但采用抗滑桩+锚索预加固支护形式对边坡能起到更为明显的加固效果, 且对边坡坡顶竖向位移沉降较小, 对于周边环境复杂的边坡更为适合。

Analysis and Comparison of Embankment Widening Schemes in Highway Renovation and Expansion Project

Based on the in-situ investigation and analysis of actual geological conditions for the renovation and expansion project of Guangxi Liuzhou-Nanning Highway, two schemes were proposed for widening embankment, one is benching into the existing slope, the other is excavation with anti-slide pile plus anchor cable pre-reinforcement. Based on the analysis and comparison of the consolidating effect of two schemes by numerical simulation with FLAC^3D, a technically sound construction scheme was proposed with more engineering factors taken into comprehensive consideration. It is found that two schemes after slope reinforcement result in the slope safety factor and vertical displacement at the top of slope all up to the standard. However, the second one with a better reinforcement and less vertical displacement is more feasible for the slope with more complicated surroundings.