为研究不同干密度下非饱和红土抗剪强度指标随含水率、基质吸力的变化特性，本文通过GEO-Experts压力板仪试验和一系列不同体积含水率下的直剪试验，探讨了基质吸力在不同干密度下对江西非饱和红土抗剪强度指标的影响。研究表明：干密度越大其抗剪强度指标越大，表观黏聚力和表观内摩擦角在一定基质吸力（400kPa）范围内随基质吸力的增大而增大，其中在低基质吸力区表观黏聚力和表观内摩擦角增幅较大，在高基质吸力区表观黏聚力和表观内摩擦角增幅较小；在同一基质吸力下干密度大的土样非饱和土抗剪强度指标也较大，同时在基质吸力较低时为一常数，当超过一定基质吸力值后就会随着基质吸力的增加而减小。
Abstract
In order to study the variation characteristics of shear strength parameters of unsaturated laterite with water content and matric suction under different dry density. In this paper, the influence of matric suction on shear strength parameters of unsaturated laterite in Jiangxi under different dry densities is studied by means of GEO-Experts pressure plate tests and a series of direct shear tests with different water content. The results show that the greater the dry density is, the greater the shear strength parameters are. The apparent cohesion and internal friction angle in a certain matric suction range (400kPa) increased with the increase of the matric suction. The apparent cohesion and apparent internal friction angle increased in the low matric suction area, and the increase is smaller in the high matric suction area. Under the same matric suction, the larger the dry density of soil samples, the shear strength parameters of unsaturated laterite are also larger. is a constant when the matric suction is low. When the value of the matric suction is more than a certain value, decreases with the increase of the matric suction.
关键词
非饱和红土 /
土－水特征曲线 /
抗剪强度指标 /
干密度
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Key words
unsaturated laterite /
SWCC /
parameters of shear strength /
dry density
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基金
国家自然科学基金(51268046);
江西省自然科学基金资助项目(20151BAB203037);
江西科技师范大学校级重点课题(ky2012zz01)。
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