固结试验法求取基床系数的运用

武汉市轨道交通二号线一期工程勘察，主要应用固结试验法对各类土层进行基床系数测试。针对参数取值中遇到的实际问题，通过分析固结法试验与其它试验方法和地区经验给出的基床系数之间的关系，结合原位荷载板试验的尺寸效应修正经验和原理，对固结试验法的基床系数进行尺寸效应修正，并考虑两种试验方法中土样尺寸和受力状态的不同及其相关性进行下沉量放大系数修正。在确定了基床系数的取值后，分别通过固结试验法原理和弹性理论法进一步推导出基床系数与压缩模量间的关系，进而可以通过验证两者的匹配性，使基床系数的取值更加合理，也更加科学地运用于地铁隧道设计中。

Consolidation Tests for Coefficient of Subgrade Reaction

It used the method of consolidation experiments to test coefficient of subgrade reaction of diffierent soils in Phase I project of Line II Wuhan racking engineering. According to the practical problems in parameter value, some size modification was made by analyzing the interrelation between consolidation tests method and other methods, regional experience and original load panel size modification practice. Discussion were also made on the difference of soil sizes and being stressed within the two methods. On the basis of the parameter value of coefficient of subgrade reaction, the interrelation between subgrade reaction coefficient and compression modulus , amount was deduced and their matching ability was verified.