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以衡阳非饱和花岗岩残积土为例,研究非饱和花岗岩残积土强度特性。采用滤纸法测定了花岗岩残积土的土水特征曲线,并进行了固结不排水剪切试验,分析了含水量及初始基质吸力对非饱和花岗岩残积土强度的影响。试验表明,在试验研究的含水量范围内,非饱和花岗岩残积土的吸力随着含水量的增大而减小,但含水量对初始基质吸力的影响较小;内摩擦角随含水量增加而线性减小,黏聚力随含水量增加呈二次曲线规律变化,而初始基质吸力对内摩擦角和黏聚力的影响呈非线性。
Taking Hengyang unsaturated granite residual soil as an example, the strength characteristics of unsaturated granite residual soil are studied. The soil-water characteristic curve of granite residual soil was determined by filter paper method, and the consolidation undrained shear test was carried out. The influence of water content and initial substrate suction on the strength of unsaturated granite residual soil was analyzed. The experimental results show that the suction of unsaturated granite residual soil decreases with the increase of water content within the range of the experimental water content, but the influence of water content on the initial substrate suction is small. The internal friction angle increases with the increase of water content Linear decrease, cohesion with the increase of water content showed a quadratic curve changes, and the initial substrate suction on the internal friction angle and cohesion was nonlinear.