深大基坑施工对隧道的影响分析及保护对策

Analysis and Remediation of the Large Deep Excavation on the Adjacent Operational Tunnel

针对苏州软土地区的某深大基坑施工对邻近已运营地铁隧道的影响进行了研究。从方案优化的角度出发,提出了相应的保护措施,包含设计方案优化及施工方案优化。反演分析得到了邻近基坑项目基坑土及地层的本构模型计算参数,并应用于有限元模拟预测基坑施工全过程对隧道结构影响的分析过程中。数值分析结果表明:提出的深大基坑施工对隧道结构的保护措施有效,施工对隧道结构的影响在可控范围之内。为今后类似工程的处理方案提供了优化思路。

This paper presents a case history of the impact of a large deep excavation in Suzhou soft soils on the adjacent operational tunnels.The remediation measures are optimized in both design and construction.The soil parameters used in the analytical model were determined by the back analysis and the calibrated parameters were used in the performance of the operational tunnel during the entire deep excavation process.The numerical analysis results indicate that,the remediation measures used in the construction is effective and the impact of the deep excavation on the adjacent operational tunnel is acceptable.