城市综合管廊基坑回填土沉降规律数值模拟分析

Numerical simulation analysis of settlement law of backfill soil in foundation pit of utility tunnel city

为了揭示地下综合管廊回填的沉降规律,以北京雄安新区某综合管廊项目为实例,利用有限元软件ABAQUS,基于土体的本构关系Mohr-Coulomb准则,建立地下综合管廊结构数值模型,以分析回填土层各断面的沉降变化规律与下方管廊结构的关系,结论提出着重压实土层较厚的回填区域,加强管廊结构设计,使用较高性能混凝土等处理措施,有效减小工后回填土的沉降,研究成果可为类似综合管廊回填施工提供一定的理论指导。

In order to reveal the settlement law of underground comprehensive pipe gallery backfilling,taking a comprehensive pipe gallery project in Xiong'an New Area as an example,a numerical model of underground comprehensive pipe gallery structure was established using the finite element software ABAQUS based on the Mohr Coulomb criterion of soil constitutive relationship.The relationship between the settlement change law of each section of the backfill soil layer and the structure of the underground pipe gallery was analyzed,and the conclusion was that the backfill area with thicker soil layer was emphasized for compaction,strengthening the structural design of the pipe gallery and using high-performance concrete and other treatment measures effectively reduces the settlement of backfill soil after construction.The research results can provide certain theoretical guidance for similar comprehensive pipe gallery backfill construction.