高速公路改扩建路堑高边坡支护方案优化设计

摘要

Highway expanding/revamping project is influenced by traffic protection and constructional period, which requires an optimized scheme to reduce side slope excavation, shorten construction period at the premise of guarantee side slope safety, as well as minimize influence to traffic. We take Hangzhou-Jinhua-Quzhou Highway expanding project as an example, to discuss the popular widening method of road cutting high slope and its stability calculation method. Combined with detailed high slope case, through finite element analysis, we explored the feasibility to carry out expanding excavation only to Class 1 side slope at road cutting after prestressed anchoring & reinforcing to slopes.%高速公路改扩建工程受保通和工期的影响，需在保证边坡安全的前提下寻求既能减少边坡开挖量，缩短施工工期，又能最大限度地减少施工对交通运营影响的优化方案。以杭金衢高速公路改扩建工程为背景，介绍路堑高边坡常用扩宽形式以及稳定性计算方法，并结合具体高边坡案例，通过有限元分析，探讨对路堑上边坡进行预应力锚索加固后，只对路堑1级边坡进行扩挖方案的可行性。