软土地区基坑开挖对临近电力顶管隧道影响研究

The Influence Study on Excavation Area of Neighboring Power Tunnel in Soft Soil

由于岩土工程地域性非常强,关于宁波软土地区基坑开挖对电力顶管隧道影响的研究报道并不多。为此,结合工程实例,从有限元数值模拟以及现场监测综合分析,从中得到如下结论:通过数值模拟与现场监测数据结果基本吻合。说明设计阶段可以利用有限元方法进行变形评估,施工阶段利用监测实时反馈,调整设计。隧道变形曲线大体呈现中间大,两头小的特点。分块开挖,及时浇筑垫层可抑制基坑变形的发展。地面沉降监测点总体呈下沉态势,与电力隧道最大变形,支护桩水平最大变形发生的时间一致。

Due to the regional experience is very strong in geotechnical engineering. The research reported about excavation in soft soil area of ningbo influenced on pipe jacking tunnel is not much. Therefore combining with engineering examples, from the FEM numerical simulation and field monitoring, by comprehensive analysis can get the following conclusion. Through the numerical simulation result was consistent with field monitoring data. It can expained that the finite element method can used in design phase to evaluate deformation. The monitoring feedback will be used to guide the design during construction. The tunnel deformation curve presented us the characteristics of the middle huge, but the two small head. Partitioned excavation and timely casting cushion inhibits the development of excavation deformation. The ground subsidence was sinking by monitoring, which was occurred at the same time with the maximum power tunnel deformation and horizontal maximum support pile deformation.