天津地铁改造中车站箱体位移控制研究

在天津市地铁一号线既有线路改造中，必须解决将原车站进行延伸改造所涉及的开挖与支护问题。由于土质软弱，需采取注浆来减少因深开挖和回填土所引起的车站箱体位移与沉降以及控制地下水渗透。因车站地处交通要道下，附近交通拥挤，使得改造工作难度较大。对控制箱体在开挖过程中的位移、改造完成并回填土后的沉降以及减少开挖改造对交通的影响的方法进行了研究，并给出了一些建议。

Control of station box displacement due to reconstruction of Tianjin Metro system

The excavation and pit support are the problems that must be solved during reconstruction and extension of the subway stations of existing line built in 1974,which was part of line No.1 of Tianjin Metro system. Because of soft ground, pre-grouting is needed to reduce the displacement and settlement of the station box due to deep excavation and back filling, and also to control ground water ingress. These stations are right under the main streets and the heavy traffic in the streets makes the work very difficult. The possible construction operations to control station box and ground displacement and minimizing the effect due to reconstruction on the traffic are researched; some suggestions are given .