西安黄土基床系数变化规律及其测试方法的相关性分析

发布时间：2018-01-09 10:33

本文关键词：西安黄土基床系数变化规律及其测试方法的相关性分析　出处：《岩石力学与工程学报》2017年10期 　论文类型：期刊论文

【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。
[Abstract]:In order to establish the value range and empirical formula of the coefficient of Xi'an loess base bed, the data of the coefficient of the base bed measured by the plate load test of Xi'an subway is adopted. The range of base bed coefficient of Xi'an loess and its variation law with depth are summarized, and the results of bed coefficient test for plate load test, pressure-pressure test, standard penetration test and consolidation test in laboratory are compared and analyzed. The correlation between the plate load test and other test methods is discussed. The results show that in the new loess, paleosol and the old loess layer, the coefficient of the base bed increases with the increase of depth. In the loess soil layer, the change of the coefficient of the base bed is not obvious with the increase of the depth. In Xi'an loess, the horizontal base bed coefficient K _ s _ x is smaller than the vertical base bed coefficient K _ T _ v, and the ratio of K _ s _ x / K _ v is normal distribution. And the ratio of Ks x / KV to the total number of experimental data 81% is in the range of 0. 5 ~ 1. 0; The coefficient of the bed measured by the plate load test is approximately linear to the modulus of the pressure-pressure and the number of the standard perforations. These results can be used as reference for the investigation and design of tunnel and foundation pit in Xi'an area.
【作者单位】：西安建筑科技大学土木工程学院;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;
【基金】：陕西省科技统筹创新工程计划项目(2016KTZDSF04 05 01)~~
【分类号】：TU444
【正文快照】： 基床系数是地基土在外力作用下产生单位变形时所需的应力,也称为弹性抗力系数或地基反力系数[1]。基床系数是隧道、基坑设计的重要参数,其取值大小、分布形式直接影响地基土压力、结构位移及内力的求解,对工程的经济性和安全性均有直接影响[2-3]。关于基床系数的测定,K.Terzag

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