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通过对某城市盾构区间下穿胶济铁路路基段和高架段的设计,利用数值模拟手段对盾构施工引起的上部铁路路基和桥桩结构的位移变形进行预判,根据预判值调整及优化设计。数值模拟结果与保护要求参数对比可知,区间下穿胶济铁路高架桥段,地表沉降和桩基位移满足15mm沉降保护要求,对路基段上覆土层进行超前加固后盾构区间施工满足铁路变形要求,并针对盾构施工提出合理的施工措施和建议。
Through the design of the subgrade and the overhead section of Jiaozhou-Jiamusi under the shield tunnel in a certain city, the displacement and deformation of the upper railway subgrade and bridge pile structure caused by shield construction are predicted by means of numerical simulation. According to the pre-judgment value and Optimize design. Comparing the results of numerical simulation and the requirements of protection, it can be seen that under the interval passing through the viaduct section of Jiaoji Railway, the settlement of ground surface and the displacement of pile foundation meet the requirements of 15mm settlement protection. The construction of the shield section ahead of the subgrade overburden meets the requirements of railway deformation, And for the shield construction put forward reasonable construction measures and recommendations.