膨胀土地层浅埋暗挖法施工方案比选分析

Comparison and Selection of Shallow Excavation Methods Analysis at Expansive Soil Layer

本文以合肥市轨道交通二号线过渡段浅埋暗挖工程为背景,对CRD法、CD法及台阶法三种施工方案进行了数值模拟。对比分析了横向地表沉降和拱顶沉降以及开挖对掌子面附近隧道变形的时空效应。并结合三种施工的现场施工方案,对三种施工方法的技术难度以及经济成本进行简要分析。研究结果表明,合肥轨道交通二号线过渡段暗挖工程采用台阶法施工技术可行,经济合理。

Based on the shallow excavation engineering of the transition of the second line of Hefei metro, a numerical simulation was carried out regarding the bench cut method, CD method, and CRD method, a con-trastive analysis of lateral surface subsidence, vault settlement. In addition, a study of the disturbance effect of excavation on surrounding rocks near the working face was performed, and the space -time effect of tunnel deformation was analyzed. Combined with the site construction program of the three construction methods, a brief analysis of the technical level and economic cost about the three methods. The results show that bench cut method is feasible and economical for the second line transition excavation engineering of Hefei tunnel construction.