基床系数是文克尔地基模型的关键参数,其基准值是采用原位载荷试验测得。采用室内试验快速准确测定基准基床系数值的相关研究较少。介绍笔者设计的基准基床系数室内测试仪及相应的试验原理;基于变形模量的等量关系、土体在均布荷载作用下变形与时间的变化规律,采用“终点沉降法”推导出室内试验的基床系数计算公式;介绍了室内测试仪的测试步骤和计算方法。经室内测试试验与原位试验对比,验证结果表明,该室内测试方法和测试结果具有效性与可靠性,能在室内准确测定各类细粒土在原位状态下的基准基床系数值,可以作为一种基准基床系数室内通用测试方法。

Subgrade reaction coefficient (SRC) is a key parameter of Winkler foundation model. The benchmark value of SRC is mostly measured by in-situ loading test, and is rarely by indoor testing. In this paper, an apparatus for SRC test is presented and the corresponding testing principles are introduced. The SRC calculation formula is given based on the terminal settlement control method, the equivalent relation of deformation modulus, and the relationship between deformation and time under uniformly distributed load. Moreover, the test steps and calculation method are also introduced. Through comparison between indoor laboratory test and in-situ test, this method has been verified by experiment on fine grained soil valid and reliable. It could be used as a universal indoor testing method for SRC.