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土石混合材料广泛应用在土石坝、堤防、路基等工程中,而这些土工结构的边坡稳定性是工程上关注的问题。在非饱和土石混合料的边坡稳定分析时,需要知道边坡的负孔隙水压分布。现场直接测试吸力(气压为零时吸力是负孔隙水压的绝对值)成本高、精度有限。因此在研究土石混合料的初始吸力特性基础上,估算初始吸力分布不失一种可行方法。本文对不同初始物理状态下土石混合材的击实试样进行初始吸力测试,分析了土石混合料的物理状态与初始吸力的关系。试验结果表明:土样的饱和度比含水率与初始吸力有更显著的关系;在饱和度相同的情况下,土样的干密度较大的土样有较大的初始吸力;土样的初始吸力随着净压力的增大而减小;在干密度、饱和度相近的情况下,土石比越大初始吸力越大;相同的击实能量下,土石比大的试样干密度小。
Earth-rock mixed materials are widely used in earth-rock dam, embankment, roadbed and other projects, and the slope stability of these geotechnical structures is an engineering concern. In the slope stability analysis of unsaturated soil-rock mixture, it is necessary to know the negative pore-water pressure distribution of the slope. Direct test of the site suction (zero pressure when the suction is the absolute value of negative pore water pressure) high cost, accuracy is limited. Therefore, based on the study of the initial suction characteristics of soil-stone mixture, it is feasible to estimate the initial suction distribution. In this paper, the initial suction test was performed on the compacted samples of rock-soil mixture under different initial physical conditions, and the relationship between the physical state of the rock-soil mixture and the initial suction was analyzed. The results show that the saturation of soil sample is more significant than the initial water content and the initial suction force. Under the same saturation condition, soil sample with larger dry density has larger initial suction force. The suction decreases with the increase of net pressure. In the case of similar dry density and saturation, the larger the initial suction is, the larger the ratio of soil to rock is.