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采用GDS循环三轴试验、压汞分析,同时辅以电镜扫描,对上海地区地铁行车荷载作用下的饱和软黏土微观性状进行定量分析研究,获得了一系列定性、定量化的结果。研究成果表明在地铁运营相当长的一段时间内,隧道侧壁和底部地层都会存在结构单元之间的压密过程,而由于隧道底部承受来自地铁的荷载较大,压密趋势有所缓和,单元之间的错动将会是变形的主要因素。
The GDS cyclic triaxial test and mercury intrusion were used to analyze the microscopic characters of saturated soft clay under the driving load of subway in Shanghai, and a series of qualitative and quantitative results were obtained. The research results show that during the subway operation for a long period of time, there will be a compaction process between the structural units on the sidewalls and the bottom of the tunnel. However, due to the large load from the subway at the bottom of the tunnel, the compacting tendency is eased. The shift between the deformation will be the main factor.