摘要
以分布在广梧高速公路沿线的高液限土和红黏土为试样,通过常规直接剪切试验,测定不同含水状态下高液限土和红黏土的抗剪强度,对比分析含水率对两者抗剪强度的影响.结果表明,高液限土和红黏土的抗剪强度均与初始含水率有明显的相关关系,初始含水率越大,抗剪强度越小;随着含水率的增大,高液限土黏聚力与含水率成指数函数关系形式减小,其内摩擦角则先小幅减小,后急剧减小;随着含水率的增大,红黏土粘聚力变化具有显著的分段性,在某一含水率区段内下降较明显,当含水率接近饱和含水率时,则趋于稳定;红黏土的内摩擦角随着含水率的增加先保持稳定,后急剧减小;土颗粒间胶结物质的不同是导致高液限土和红黏土水敏感性不同的主要原因.
The shear strengths of high liquid limit soil and red clay taken from the Guang-Wu Expressway were measured by direct shear test, and the influences of water contents on shear strengths of the high liquid limit soil and red clay were analyzed. The results indicate that there are negative relationships between the shear strengths and initial water contents of the high liquid limit soil and red clay. With the increase of water content, the cohe-sion of high liquid limit soil and its water content decreases in exponential form while its internal friction angle firstly decreases by small margin and then sharply declines. Similarly, with the increase of water content, the co- hesion of red clay decreases in segments. When the water content approaches saturation moisture content, the co-hesion of red clay is stable. The internal friction angle of red clay remains stable at the beginning and then sharply declines with the water content increasing. High liquid limit soil and red clay have different water sensitivities mainly because of the difference in their cementing materials of soil particles.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2013年第1期78-83,共6页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(51079052)
广东省交通科技资助项目(2009-03-005)~~
关键词
岩土工程
高液限土
红黏土
水敏感性
抗剪强度
直剪试验
含水率
geotechnical engineering
high liquid limit soil
red clay
water sensitivity
shear strength
directshear test
water content
