地铁设计中基床系数的解决方案

基床系数是地铁设计计算的重要参数.基于地铁设计的荷载特点,按照地铁勘察规范规定的测试方法,分析已有基床系数的研究成果和取值现状,应用土力学原理,对地铁设计中使用的基床系数做了必要的推定,推导并给出黏性土和砂石类土基床系数以压缩模量为已知参数的计算公式;通过计算验证,证明按此计算公式得到的基床系数计算值与规范给出的经验值基本一致,从而解决了基床系数的取值问题.

On the Coefficient of Subgrade Reaction in Metro Design

The coefficient of subgrade reaction k is an important parameter in metro design. According to the test method stipulated by the Subway Exploration Norm, the author analyzed the research results and the current values of coefficient of subgrade reaction in metro design, applying soil mechanics principles, deduced and put forward calculation formulas for the coefficients of subgrade reaction on cohesive soils and sandy soils with Es the modulus of compressibility as the known value. Through computation identification, it was proved that the values of the coefficients of subgrade reaction calculated by the formulas proposed by the author were in good coincidence with those empirical values given by the Norm.