软土地层盾构侧穿高铁桥墩变形分析

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中图分类号：TU478 文献标志码：A 文章编号：1008-0562（2026）02-0205-11

Abstract：To analyzethe control effectof the portalisolation structure on ground settementand the displacement of high-speed railway bridge piers in soft soil layers，as wellas the stress state of the isolation structure itself，a three-dimensional model was established based on theNanjing Metro Line 6shield side-crossing the ShanghaiNanjing intercity high-speed railway bridge pier project.The simulated results were compared with the field measuredvalues to verifythe reliabilityofthe three-dimensional model.On this basis，the sensitivityof the key parameters of the isolation pile was analyzed and the optimal parameter combination was proposed.The results show that the ground displacementcaused by shield tunneling is distributed ina“V” shape，which conforms to thePeck curve.The displacement of the pier exhibits dynamic response characteristics，with its deformation mainlyoccurring during the stage when the shield enters and exits the affected area.The portal isolation structure has a significant effct onthe deformation control of theaffected section，which can effectively control the displacement of high-speed railway bridge piers.The thickness of the isolation pile，thedepth into the tunnel bottom and the distance from the shield havea significant effect on the control effect of surface settlement and pierdisplacement.Anisolation pile with a thickness of 1.2m ，adepthof 3.0m into the bottom of the tunnel，and a distance of 1.0m from the shield is adopted， and a connecting beam with a spacing of 6.0m is set up，which can ensure the safe operationof the high-speed railway while taking into account the engineering economy.The researchconclusions can provide designreferencefor similar projects of shield side-crossing sensitive structures in soft soil layer.

收稿日期：2025-10-23修回日期：2026-01-04 接受日期：2026-01-08 责任编辑：朱含露基金项目：国家自然科学基金项目（52178337）作者简介：杨平（1964-），男，江西宜春人，硕士，教授，主要从事地下工程方面的研究。（剩余15518字）