含水率及应力对原状黄土静止侧压力系数的影响

doi:10.13722/j.cnki.jrme.2016.0012

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摘要

天然土层静止侧压力系数的确定是岩土工程中一个十分重要的问题。用可以测量侧向应力的K₀固结仪对不同含水率Q₃原状黄土进行侧限压缩试验，分析加载卸载路径、竖向应力及含水率对侧向应力及静止侧压力系数的影响，基于试验结果提出加载时静止土压力系数K₀与竖向应力及含水率关系的表达式。研究结果表明，原状黄土的静止土压力系数值不是常数，且不能用Jaky公式进行预测，而是与竖向应力、含水率及加卸载条件密切相关；加载时K₀随竖向应力的增大而增大且趋于稳定值，卸载时静止土压力系数K_0OC随竖向应力的减小而增大，且可能大于1；加载及卸载时静止土压力系数皆随含水率的增大而增大；含水率及竖向应力相同时，卸载时K_0OC值比加载时K₀值大。加载时不同含水率原状黄土的K₀与竖向应力关系皆可以用双曲线模式描述，用此模式可以较好地预测K₀值；卸载时K_0OC与超固结比间呈幂函数关系，但幂指数不等于前人的建议值。

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	陈存礼1
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	贾亚军1
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	张登飞1
	孙亚榕1
	李丰莲1

关键词 ：土力学, 原状黄土, 侧限压缩试验, 含水率, 应力, 静止侧压力系数

Abstract：

The determination of coefficient of lateral pressure at rest in a natural soil deposit is a problem of considerable significance in geotechnical engineering. One-dimensional confining compression tests were carried out on specimens of Q₃undisturbed loess with different water contents using an instrument oedometer to measure lateral stress. The influences of vertical stress and water content as well as loading and unloading paths on the lateral stress and coefficient of lateral pressure at rest were analyzed. The expression was presented to describe the relationship between the coefficient of lateral pressure at rest K₀under loading path and vertical stress as well as water content based on test results. The results showed that the coefficient of lateral pressure at rest was not always a constant and could be not calculated with Jaky¢s formula for undisturbed loess. Whereas，it was dependent on applied vertical stress and water content as well as loading and unloading paths. K₀under loading path first increased and then leveled off to a relatively constant with increasing vertical stress. The coefficient of lateral pressure at rest K_0OCunder unloading path increased considerably with decreasing vertical stress，usually in excess of unity. Under both loading and unloading paths，the coefficient of lateral pressure at rest increased with increasing water content. For the same water content and vertical stress，the coefficient of lateral pressure at rest was larger under unloading than loading path. The relationships between K₀ and vertical stress could be described with the hyperbolic expression under loading path for undisturbed loess with different water contents. The results had confirmed that reliable predictions of K₀ could be made using the proposed expression. There was a good power-law relationship between K_0OC and over-consolidation ratio under unloading path，and the value of the power-law exponent was not equal to that proposed by predecessor.

Key words： soil mechanics undisturbed loess confining compression test water content stress coefficient of lateral pressure at rest

引用本文:

陈存礼1，2，贾亚军1，金娟3，张登飞1，孙亚榕1，李丰莲1. 含水率及应力对原状黄土静止侧压力系数的影响[J]. 岩石力学与工程学报, 2017, 36(S1): 3535-3542.
CHEN Cunli1，2，JIA Yajun1，JIN Juan3，ZHANG Dengfei1，SUN Yarong1，LI Fenglian1. Influences of water content and stress on coefficient of lateral pressure at rest of undisturbed loess. , 2017, 36(S1): 3535-3542.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0012 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS1/3535

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