关键词: 新建管线, 地铁车站, 主动竖向反应, Pasternak地基模型, 差异沉降

Abstract: In order to control the differential settlement of new-constructed pipelines overpassing subway station at a short distance,a deformation calculation model was built based on the Pasternak-type two-parameter model and the three polyline elastic-plastic load transfer model. The finite difference method was used to solve this problem. A case was used to analyze vertical displacement and bending moment of pipeline. The influences of parameters were discussed. The results show that at a certain distance from the station edge line, vertical response of pipeline tends to be stable, and taking two times of the station width as the impact length can meet the practical requirements, that it is advisable to use materials with larger elastic modulus in the underlying soil, that for the pipeline of the impact section, improving pipeline stiffness is helpful to control differential settlement, and grouting reinforcement underlying soil can obviously reduce the differential settlement, and that when the engineering grouting length is 0.5 L, the area between area of 0.5-0.75 L and 1.75-2 L away from the subway station edge should be reinforced.

Key words: new-constructed pipeline, subway station, active vertical response, Pasternak foundation model, differential settlement