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某变电站为新建工程,基坑拟开挖平均深度为2.7m左右,需降水至自然地坪以下3.0m处,属于放坡开挖工程。所选址地层表层为耕土,厚度不大,岩性主要以褐黄～灰黄色粉土为主,渗水性能较差;依据工程地质勘察报告提供的该土层横向渗透系数为0.1～1.0m/d,而垂直渗透系数很小,可以不予考虑。根据本工程土质特点,提出了各建(构)筑物采取降排结合的优化措施:对污水泵池基槽进行止水帷幕桩进行基坑支护;主
A substation is a new construction project. The average excavation depth of the foundation pit is about 2.7m. It needs to be lowered to 3.0m below the natural floor, which belongs to the grading and excavation works. The surface layer of the selected site is cultivated soil with small thickness. The lithology mainly consists of brownish yellowish to yellowish silty silt with poor water seepage performance. According to the engineering geological survey report, the horizontal permeability coefficient of the soil layer is 0.1-1.0m / d, while the vertical permeability coefficient is small, can not be considered. According to the characteristics of the soil of the project, the optimization measures of combining all the structures (structures) with reduction of discharge are put forward: the foundation pit supporting for the water-proof curtain pile in the base of the sewage pump;