地铁小净距叠交隧道近接施工影响的数值模拟分析

以深圳地铁7号线红岭北站—笋岗站区间工程为背景,通过建立三维数值模型并结合经验计算公式,研究了盾构隧道施工引起的地表沉降以及后期施工隧道对先期施工隧道的影响。基于实际工程中存在的5种工况,对比分析隧道在不同空间角度和净距下地表沉降的变化规律以及后期施工隧道对先期施工隧道的影响规律。研究结果可为今后类似工程提供一定的参考和借鉴。

Numerical Simulation Analysis of the Interactive Impact between Small-clear-distance Overlapped Metro Tunnels during Construction

Based on the tunnel construction between North Hongling Station and Sungang Station on Shenzhen Metro Line 7,a 3D numerical simulation model is established,and the empirical formulas are used to study the ground surface settlement caused by shield tunnel construction and the impact of the pre and post tunnel constructions.Based on 5 types of practical circumstances,the change rules of ground surface settlement and the impact rules of later tunnelling on early tunnelling under different space angles and clear distances are compared.The main conclusion of the research could be used as a reference for similar projects in the future.