粗颗粒盐渍土力学参数的现场直剪试验研究

Study on the field shearing test of coarse grained saline soil

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。

The coarse saline soil strength characteristics and parameter value were studied by field shearing test at a typical coarse saline soil site. The test results show that the cohesion of coarse saline soil is affected by salt cementation obviously; the friction angle is mainly influenced by the particle distribution; the cohesion value is generally from 45 k Pa to 80 k Pa,while the friction angle is between 34°and 38° when the salt cemented; the cohesion value is generally within 9 k Pa to 15 k Pa,and the friction angle is between 33° and 38° when the gravelly saline soil is loose. The research results could be referred by the engineering design of coarse grained saline soil.