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通过对典型粗颗粒盐渍土场地角砾土进行现场直接剪切试验,研究了粗颗粒盐渍土的强度特性及参数取值。试验结果表明:粗颗粒盐渍土强度参数由黏聚力和内摩擦角组成,盐分的胶结对黏聚力的影响比较明显,颗粒的组成则对内摩擦角影响较大。同时,对于角砾类粗颗粒盐渍土,当存在盐胶结作用时,建议黏聚力值在45~80k Pa、内摩擦角在34~38°之间选取;当角砾类盐渍土结构松散时,建议黏聚力值在9~15k Pa、内摩擦角可在33~38°之间取值。该研究成果可直接为粗颗粒盐渍土地区的工程设计提供借鉴。
Through the field direct shearing tests on typical coarse-grained saline soil, the strength characteristics and parameter values of coarse-grained saline soil are studied. The results show that the strength parameters of coarse-grained saline soil are composed of cohesion and internal friction angle, and the effect of salt cementation on cohesion is obvious. The composition of particles has a great influence on internal friction angle. At the same time, for coarse grained saline soil, when the salt cementation exists, the proposed cohesion value is 45 ~ 80k Pa and the internal friction angle is 34 ~ 38 °. When the gravel saline soil structure Loose, the proposed cohesion value 9 ~ 15kPa, internal friction angle can be between 33 ~ 38 ° value. The research results can directly provide reference for engineering design of coarse-grained saline soil area.