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上海深古河道地层特性及对地铁车站基坑影响
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Abstract:
长江口在第四纪晚更新世末期形成的“深古河道”内沉积了厚度较大的以饱和黏性土为主的沉积物，对地铁工程有重要的影响。本文以上海轨道交通18号线建设为背景，结合各车站的地层结构特征，划分了四类地层单元，结合现场实测资料，分析了古河道地层对地铁车站基坑变形的影响。统计分析了典型深古河道地层(⑤3粉质粘土)的基本物理力学特性，并通过静力触探法给出了不排水抗剪强度随深度的变化规律。
The “deep paleochannel” formed in the late Pleistocene of the Quaternary at the mouth of the Yangtze River deposited thick saturated clay, which had a significant impact on subway projects. In this paper, taking the construction of Shanghai Metro Line 18 as the background, considering the geological structure characteristics of each station, four types of geological units were proposed. Based on on-site measurements, the influence of paleochannel strata on the deformation of subway station excavation was analyzed. The basic physical and mechanical properties of typical paleochannel strata (⑤3 silty clay) were statistically analyzed, and the variation of undrained shear strength with depth was obtained by cone penetration method.
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