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上海市正在施工的徐家汇地下铁道车站,其地基属饱和含水的软弱淤泥质粘土和粉质粘土层,基坑开挖采用地下连续墙为围护结构。基坑挖深16.7m、坑宽23m,纵向延长600余m,为条形深大基坑。坑外附近在浅地表以下约2m处埋设有各种地下管线,外侧为路面,稍远有民用建筑物群。过去这方面的工程实践经验不多,因而,要求对深基坑的土体稳定性、墙后地表土体沉降,以及墙体在开挖过程中的走动与支撑杆的内力等作分析,按弹塑性土体采用非线性有限元法进行计算,供本工程设计预测与改进以及今后类似上程设计与施工参考。为此,所编制的地下墙设计程序—DWDP-I,可供有关设计、施工单位参考采用。文后并将计算成果与已进行的工程施工监控量测所得的相应数据作了对比探讨。
Shanghai Xujiahui subway station under construction, the ground is saturated with water and soft silty clay and silty clay layer, the use of underground diaphragm wall excavation dug excavation structure. Pit excavation depth of 16.7m, pit width of 23m, extending more than 600 meters in length, for the strip deep pit. Near the pit, a variety of underground pipelines are buried at about 2m below the shallow ground surface, with the outer side being the pavement and a little further away from the civil buildings. Therefore, it is required to analyze the stability of deep foundation pit soil, the settlement of ground surface soil behind the wall, as well as the movement of the wall during excavation and the internal force of the support rod. According to The elasto-plastic soil is calculated by nonlinear finite element method for the prediction and improvement of the project design and future similar design and construction reference. To this end, the preparation of the underground wall design process-DWDP-I, available for design and construction unit for reference. After the text and the calculation results have been carried out with the project construction monitoring measurements obtained from the corresponding data were discussed.