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以广珠准高速铁路软土路堤试验沉降测试结果为例,对软土地基处理中的坡脚外边桩沉降、地表横纵向差异沉降、侧向位移引起的沉降等问题进行了分析,并提出了沉降计算中地基压缩土层厚度的确定方法。对大变形的深厚软土地基,在沉降和稳定计算中应考虑沉降引起的路堤填筑荷载的增加值;对铁路路堤,可不考虑不同地基处理方法引起的竣工后差异沉降;在进行沉降计算时,宜针对地基的不同位置,分别采用应力法和应变法确定地基土体压缩层的厚度。
Taking the test results of soft soil embankment test of Guangzhou-Zhuhai high-speed railway as an example, this paper analyzes the settlement of side piles outside the foot of slope in soft soil foundation treatment, the differential settlement of the horizontal and vertical directions on the ground surface and the settlement caused by lateral displacement, Method of Determining the Thickness of Subgrade Compaction in Settlement Calculation. For large deformation of deep soft soil foundation, the added value of embankment filling load caused by settlement should be considered in the settlement and stability calculation. For railway embankment, differential settlement due to different ground treatment methods can not be taken into consideration. When settlement calculation is carried out , Should be based on the different locations of the foundation, respectively, using stress and strain method to determine the thickness of the soil layer compression layer.