基坑支护结构上的水土压力试验及计算  

Earth and water pressures on supporting structure around a foundation pit

作　　者：宋磊[1] 温庆博[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2003年第11期1572-1575,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50274042)

摘　　要：为研究应力路径对土体强度参数的影响,进行了模拟基坑开挖的室内模型试验。通过常规三轴压缩试验和减压三轴压缩试验分别获取土样在两种不同应力路径时的强度指标,分别用于计算模型试验支护结构上的水土压力,并与模型试验结果进行分析比较。结果表明:减压三轴试验的应力路径与模型试验的应力路径基本一致;采用减压三轴强度指标计算得到的水土压力比用常规三轴强度指标得到的要小,也更接近试验结果。Model tests simulating the excavation of foundation pits were conducted to study the relationship between stress paths and strength parameters. Two sets of strength parameters for different stress paths were obtained separately from conventional triaxial compression tests and reduced triaxial compression tests. The strength parameters were used to estimate the earth and water pressures on the retaining structure of the model tests and the results compared well with the model tests. The comparisons show that the stress path in the reduced triaxial compression tests is basically the same as that in the model tests. The water and earth pressures estimated using the reduced triaxial total strength parameters are less than those found using conventional triaxial total strength parameters and in better accordance with the model tests.

关 键 词：基坑支护结构 水压力 土压力 强度指标 模型槽 

分 类 号：TU753.8[建筑科学—建筑技术科学] TU473