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以上海一超大直径泥水平衡顶管工程为依托,基于流固耦合分析原理,利用数值模拟方法对顶管横向地表沉降进行研究。建立由顶管管片、泥浆套、施工扰动层和周围土层组成的流固耦合模型以及非耦合模型,分析注浆压力以及泥膜形成与否对地下水位和顶管横向地表沉降的影响,同时也分析了注浆与停止注浆时的地表沉降变化。实践证明,现场横向沉降实测数据与耦合结果一致,说明耦合数值模型具有可行性,可以为顶管工程的后续施工提供指导。
Based on the project of a super-large-diameter mud-water balance pipe jacking project in Shanghai, based on the principle of fluid-solid coupling analysis, the lateral settlement of the pipe jacking is studied by numerical simulation method. The fluid-structure interaction model and the non-coupling model are established, which are composed of pipe jacking, mud jacket, construction disturbance layer and surrounding soil, and the influence of grouting pressure and formation of mud film on the horizontal ground surface settlement of jacking pipe is analyzed. The change of surface subsidence during grouting and stop grouting is also analyzed. The practice shows that the measured data of lateral settlement are consistent with the coupling results, which shows that the coupled numerical model is feasible and can provide guidance for the follow-up construction of pipe jacking project.