西安黄土基床系数变化规律及其测试方法的相关性分析  

Reaction coefficient of subgrade on Xi'an loess and correlation analysis of methods of measurement

作　　者：于永堂[1,2] 唐浩 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]机械工业勘察设计研究院有限公司陕西省特殊土工程性质与处理技术重点实验室,陕西西安710043

出　　处：《岩石力学与工程学报》2017年第10期2563-2571,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：陕西省科技统筹创新工程计划项目(2016KTZDSF04–05–01)~~

摘　　要：为确立西安黄土基床系数的取值范围和经验公式,根据西安地铁采用K_(30)平板载荷试验测得的基床系数资料,归纳西安黄土基床系数的范围及其随深度的变化规律,对比分析K_(30)平板载荷试验、旁压试验、标贯试验及室内固结试验的基床系数测试结果,探讨K_(30)平板载荷试验与其他试验方法间的相关关系。结果表明:在新黄土、古土壤及老黄土地层中基床系数随深度增加总体呈增大趋势,在黄土状土地层中基床系数随深度增加变化规律不明显;西安黄土的水平基床系数K_x以小于垂直基床系数K_v为主,K_x/K_v比值呈现正态分布,且约占试验数据总数81%的K_x/K_v比值分布在0.5~1.0范围;由K_(30)平板载荷试验测得的基床系数与旁压模量、标贯击数均近似呈线性关系,与压缩模量及压缩系数近似呈二元幂函数关系。这些结果可供西安地区隧道、基坑工程的勘察设计参考使用。The ranges of coefficient of subgrade reaction in different soil layers and the relationships of coefficient of subgrade reaction with depth are analysed based on the measurement with K30 plate load test in Xi￠an Metro. The measured coefficients of subgrade reaction from the K30 plate load test,the pressure-meter test,the standard penetration test,and the laboratory consolidation test are compared and analyzed with the method of regression analysis. The results show that the coefficients of subgrade reaction of the new loess layer,the old loess layer and the paleosol layer increase with depth,but the variation regularity is not obvious in the loess-like soil layer. The horizontal coefficient of reactionKx is mostly smaller than the vertical coefficient of subgrade reactionKv. In general,the ratio Kx/Kv exhibits a normal distribution. The values ofKx/Kv of nearly 81% of the total test data are distributed in the range 0.5–1.0. The measured coefficients of subgrade reaction vary linearly with the pressure-meter modulus and the SPT counts. The measured coefficients of subgrade reaction have approximately the quadratic relationships with the modulus of compressibility and the coefficient of compressibility.

关 键 词：土力学 黄土 基床系数 K30平板载荷试验 标贯试验 旁压试验 室内固结试验 

分 类 号：TU43[建筑科学—岩土工程]