中粗砂改良膨胀土力学特性试验研究

Mechanical properties test of expansive soil improved by medium-coarse sand

为了研究中粗砂对膨胀土力学性能的影响,采用不同掺砂量和不同初始含水率交叉实验方案,进行了三轴试验、无侧限抗压试验。试验结果表明:随着掺砂量的增加,主应力差以及无侧限抗压强度呈现先增大后减小的趋势,在最佳掺砂量10%时达到最大值;随着含水率的增加,主应力差以及无侧限抗压强度呈现先增大后减小的趋势,在最佳含水率达到峰值。

In order to study the effect of medium coarse sand on the mechanical properties of expansive soil,Cross testing schemes with different sand content and different initial water content were adopted.Triaxial compression test and unconfined compressive strength test were carried out.The results show that with the increase of sand content,the principal stress difference and unconfined compressive strength show that the first increases and then decreases,reaching the maximum when the optimal sand content is 10%.With the increase of water content,the principal stress difference and unconfined compressive strength show that the first increases and then decreases,reaching the maximum at the optimal water rate.