浅埋矩形顶管施工地表沉降特性试验研究

Rectangular Pipe Jacking Construction

随着城市地下空间的开发与利用,浅埋矩形顶管工程应用越来越广泛,顶管施工引起地表变形对上部结构的正常使用与安全产生影响。基于模型试验方法,设计了室内模型试验,模拟矩形顶管顶进过程,分析了土体扰动变形规律。试验研究表明,矩形顶管施工引起地表沉降的横向影响范围主要发生在距顶管中线2倍顶管宽度,地表隆起则主要发生在顶管管节正上方;后续顶管施工会对已顶进区域土层持续产生扰动,施工过程中应加强地表变形监测,在防止地表过量沉降的同时,应防范浅埋矩形顶管产生背土效应导致的地表隆起破坏。研究成果可为相关矩形顶管工程设计和施工提供技术参考。

With the development and utilization of urban underground space,shallow buried rectangular pipe jacking engineering is widely used.The surface deformation caused by pipe jacking construction has an impact on the safety of superstructures.Based on the model test method,a laboratory model is designed to simulate the jacking process of rectangular pipe jacking,and the law of soil disturbance and deformation is analyzed.The test results show that the transverse influence range of ground settlement mainly occurs at twice the pipe jacking width from the pipe jacking center line,and the surface uplift mainly occurs directly above the pipe jacking.The subsequent pipe jacking construction will continuously disturb the soil layer in the jacked area,and the ground deformation monitoring shall be strengthened during the construction process.In addition to preventing excessive ground settlement,it is also necessary to prevent surface uplift damage caused by back soil effect in shallow buried rectangular pipe jacking.The research results can provide a reference for the design and construction of relevant rectangular pipe jacking project.