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投稿时间：2022-01-27 修订日期：2022-07-26
投稿时间：2022-01-27 修订日期：2022-07-26
中文摘要: 土体的静止侧压力系数K0是其重要的力学参数之一，合理地确定土体的K0系数对土工结构应力变形的准确计算有重要的理论意义与实用价值。然而，准确测量土体的K0系数并不容易，对粗颗粒土则更加困难。目前，能研究粗颗粒土K0的试验仪器极少，对K0系数的研究成果相应地也很少，而关于粗颗粒土在不同初始孔隙比下K0系数的变化规律的研究几乎空白。为研究粗颗粒土的静止侧压力系数在不同初始孔隙比下的变化规律，研制了一种新型K0试验仪。该仪器既能用于测定粗颗粒土的K0系数，也可用于一般黏土或砂土K0的测定，且可用于高应力条件下。对某级配粗粒料进行了不同初始孔隙比状态下的K0压缩试验。试验粗颗粒土的母岩为似斑花岗岩，颗粒粒径范围<20 mm。试样高度为8 cm，直径为10 cm，初始孔隙比为0.3、0.4、0.5、0.6，试验最大竖向压力为3.7 MPa。结果表明：当对试验粗粒料在K0状态下加载时，侧向应力与竖向应力之间呈现较好的线性关系，K0为常数。初始孔隙比为0.3、0.4、0.5、0.6时，K0的范围为0.30～0.45，孔隙比对K0系数的影响显著；粗粒料的静止侧压力系数随着初始孔隙比的增加而增加，且两者之间近似呈直线关系；不同初始孔隙比条件下，试样的体积应变与平均正应力（或竖向应力）之间可用幂函数拟合；提出能够反映不同初始孔隙比的粗粒料K0条件下的应力应变关系经验公式。
Abstract:The coefficient of earth pressure at rest, K0, of soil is one of its important mechanical parameters, and it is of important theoretical significance and practical value to accurately determine the coefficient K0. However, it is difficult to measure this coefficient, and much more difficult for coarse-grained soils. There are few apparatuses that can be used for studying K0 of coarse-grained soils so far, and there is almost no research on the variation law of K0 of coarse-grained soils under different initial void ratios. To investigate the variation law of the at-rest earth pressure coefficient of coarse-grained soil under different initial void ratios, a new type of apparatus K0 for the test was developed. This apparatus can be used to determine the K0 of coarse-grained soil, as well as clay or sand, and can work under high-stress conditions. Several K0 tests were carried out on coarse-grained soil with different initial void ratios using this new apparatus. The parent rock of the tested coarse-grained soil was a porphyritic granite, and the particle size was less than 20 mm. The sample was 8 cm in height and 10 cm in diameter with initial void ratios of 0.3, 0.4, 0.5 and 0.6. The maximum vertical pressure was 3.7 MPa. The test results showed that when the soil was loaded under the K0 state, there was a good linear relationship between lateral stress and vertical stress, and thus K0 could be taken as a constant. With the initial void ratios of 0.3, 0.4, 0.5 and 0.6, the K0 ranged roughly from 0.30 to 0.45, and the effect of the void ratio on the K0 coefficient was evident. The at-rest earth pressure coefficient of the coarse-grained soil increased with the increase of the initial void ratio, and there was an approximately linear relationship between the two parameters. A power function could be fitted between the volumetric strain and the average normal stress (or vertical stress) of the samples under different initial void ratio conditions, and an empirical formula that could reflect the stress-strain relationship of coarse-grained soil under K0 conditions with different initial void ratios was proposed.
keywords: coefficient of at-rest earth pressure coarse-grained soil initial void ratio volumetric strain average normal stress
文章编号：202200082 中图分类号：TU43 文献标志码：
基金项目:长江水科学研究联合基金重点支持项目（U2040221）；河海大学大型仪器设备共享基金（GX202205B；GX202204B）
| 作者 | 单位 | |
| 朱俊高 | 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098 | zhujungao@hhu.edu.cn |
| 蒯青青 | 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098 | qqqKuai@163.com |
| 王思睿 | 镇江电力设计院, 江苏 镇江 212000 | |
| 褚福永 | 丽水学院, 浙江 丽水 323000 |
作者简介:第一作者：朱俊高(1964-),男,教授,博士.研究方向:土石坝.E-mail:zhujungao@hhu.edu.cn;通信作者：蒯青青,E-mail:qqqKuai@163.com
引用文本：
朱俊高,蒯青青,王思睿,褚福永.粗粒料静止侧压力系数及其变形特性试验[J].工程科学与技术,2023,55(4):162-168.
ZHU Jungao,KUAI Qingqing,WANG Sirui,CHU Fuyong.Experiment of Coefficient of Earth Pressure At-rest of Coarse-Grained Soil and Its Deformation Behavior[J].Advanced Engineering Sciences,2023,55(4):162-168.
引用文本：
朱俊高,蒯青青,王思睿,褚福永.粗粒料静止侧压力系数及其变形特性试验[J].工程科学与技术,2023,55(4):162-168.
ZHU Jungao,KUAI Qingqing,WANG Sirui,CHU Fuyong.Experiment of Coefficient of Earth Pressure At-rest of Coarse-Grained Soil and Its Deformation Behavior[J].Advanced Engineering Sciences,2023,55(4):162-168.