砂性土填料抗剪强度指标的试验研究

Experimental study on shear strength indexes of sandy filling

压实度及含水率是影响砂性土填料抗剪强度指标的重要因素。以厦蓉高速漳州段砂性土填料为研究对象,通过击实试验和18组正交设计的直剪试验,对不同含水率及压实度下砂性土填料的抗剪强度指标进行研究。击实试验结果表明,砂性土填料的最大干密度为1.88g/cm3,最优含水率为10.2%。直剪试验结果表明:砂性土填料的内摩擦角随压实度的增大呈近似线性增长,但与含水率无明显相关;砂性土填料的黏聚力随压实度的增大呈近似线性增长,同时随含水率的增大先增大后减小,在最佳含水率附近达到最大值。

The compactness and the moisture content are two important factors affecting the shear strength indexes of sandy filling.Based on the high embankment project in Xiarong Expressway, the shear strength indexes of sandy filling with different compactness and water content are carefully studied through direct shearing tests.The compaction tests show that the maximum dry density and the optimal water content are 1.88g/cm 3 and 10.2%, respectively.The direct shearing tests show that the friction angle increases linearly with the compactness but has little relation with the water content.The cohesion also increases linearly with the compactness.On the other hand, the cohesion increases and then decreases with the water content, and reaches its maximum at the optimal water content.