岩土工程学报2024，Vol.46Issue(10)：2174-2182,9.DOI:10.11779/CJGE20230850
竖向卸荷下砂土和粉质黏土力学特性试验研究
Experimental study on mechanical behavior of sand and silty clay under vertical unloading
吴楷 1陈仁朋 1孟凡衍 1胡博2
作者信息
- 1. 湖南大学地下空间先进技术研究中心,湖南 长沙 410082||湖南大学土木工程学院,湖南 长沙 410082||湖南大学建筑安全与节能教育部重点实验室,湖南 长沙 410082
- 2. 湖南大学土木工程学院,湖南 长沙 410082
- 折叠
摘要
Abstract
The ultimate unloading ratio and the critical unloading ratio are the crucial parameters for determining the depth of disturbance below excavation base.The vertical unloading tests are performed on the Fujian sand and Fuzhou silty clay,with characteristic unloading ratios determined based on the normalized resilience value.The results indicate that the unloading response of soils changes in three phases.When the loading ratio is less than the critical unloading ratio,the response of soils can be ignored.Meanwhile,as the loading ratio exceeds the ultimate unloading ratio,the normalized resilience value and lateral pressure coefficient of soils increase rapidly,and the resilience modulus and shear modulus decrease significantly.Additionally,at this point,the horizontal residual stress ratio displays an inflection point and begins to decline.Furthermore,the test methods and the judgment criteria of characteristic unloading ratios are analyzed.The statistical mean values of the characteristic unloading ratios of clay,silt and sand in the unloading tests are calculated.关键词
开挖卸荷/扰动/卸荷比/剪切波速/侧压力系数Key words
excavation unloading/disturbance/unloading ratio/shear wave velocity/lateral earth pressure coefficient分类
建筑与水利引用本文复制引用
吴楷,陈仁朋,孟凡衍,胡博..竖向卸荷下砂土和粉质黏土力学特性试验研究[J].岩土工程学报,2024,46(10):2174-2182,9.
