利用扁铲试验成果外推粉细砂层深部承载力参数

Extrapolation of the Parameter of Bearing Capacity in Deep Fine Sand Layer with Flat Dilatometer Test Result

如何确定粉细砂层深部的力学参数,是水利枢纽设计过程中的一个重要课题,提出了一种新的研究思路,即在现场进行一定深度范围内的承载力试验,研究河床覆盖层原位承载力参数随深度的变化规律;再采用扁铲试验确定其试验参数随深度的变化规律;通过相关分析建立了两种数据之间的相关关系,利用该关系式由扁铲侧胀测试成果外推粉细砂层深部的地基承载力参数;结果表明是一种切实可行的方法。

It is an important project how to determine the mechanical parameter of deep fine sand layer during the hydro-junction design. A new research thought has been put forward. The rule of in-situ bearing capacity parameter of riverbed overlays has been studied through in-situ bearing capacity test within a range of certain depth, and the rule of test parameter along depth has been ascertained with flat dilatometer test. The relationship between data of in-situ bearing capacity test and data of flat dilatometer test has been founded through correlation analysis. Then according to the relationship the parameter of bearing capacity of foundation has been extrapolated by flat dilatometer test result. It is indicated that the method discussed above is practical and useful.