基坑开挖对软黏土中邻近隧道变形的影响分析

Analysis of the Influence of Foundation Pit Excavation on Adjacent Tunnel Deformation in Soft Clay

针对基坑开挖在软黏土地区具有显著的时空效应的特点,采用线性Drucker-Prager模型和时间硬化幂函数法则耦合的蠕变模型以反映基坑开挖的时空效应,将该蠕变模型运用于某基坑施工的数值模拟,重点分析基坑施工对邻近隧道变形影响。数值模拟结果表明:采用该耦合蠕变模型所得的隧道收敛变形计算值与监测数据大致吻合,可有效反映基坑开挖的时空效应,可为类似工程的施工控制提供理论依据。

In view of the significant spatial and temporal effect of foundation pit excavation in soft clay area,a creep model coupled with linear Drucker-Prager model and time-hardening power function law was adopted to reflect the spatial and temporal effect of foundation pit excavation.The creep model was applied to the numerical simulation of a foundation pit construction,and the influence of foundation pit construction on the deformation of adjacent tunnels was analyzed with emphasis.The numerical simulation results show that the convergence deformation calculated by using the coupled creep model is roughly consistent with the monitoring data,which can effectively reflect the spacetime effect of foundation pit excavation,and provide a theoretical basis for the construction control of similar projects.