西安黄土基床系数变化规律及其测试方法的相关性分析

doi:10.13722/j.cnki.jrme.2017.0578

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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以小于垂直基床系数为主，比值呈现正态分布，且约占试验数据总数81%的比值分布在0.5～1.0范围；由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。

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	于永堂1
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关键词 ：土力学, 黄土, 基床系数, 平板载荷试验, 标贯试验, 旁压试验, 室内固结试验

Abstract：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 plate load test in Xi?an Metro. The measured coefficients of subgrade reaction from the 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 reaction is mostly smaller than the vertical coefficient of subgrade reaction . In general，the ratio exhibits a normal distribution. The values of 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.

Key words： soil mechanics loess coefficient of subgrade reaction plate load test standard penetration test pressuremeter test laboratory consolidation test

引用本文:

于永堂1，2，唐浩2. 西安黄土基床系数变化规律及其测试方法的相关性分析[J]. 岩石力学与工程学报, 2017, 36(10): 2563-2571.
YU Yongtang1，2，TANG Hao2. Reaction coefficient of subgrade on Xi?an loess and correlation analysis of methods of measurement. , 2017, 36(10): 2563-2571.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0578 或 http://www.rockmech.org/CN/Y2017/V36/I10/2563

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