粉煤灰改良硫酸盐渍土强度特性试验研究

Experimental study on strength properties of sulphate saline soil improved by fly ash

为解决西北内陆干旱地区硫酸盐渍土强度低、工程应用性差的问题,通过人工配制不同配比的粉煤灰改良硫酸盐渍土,进行不固结不排水条件下的室内三轴剪切试验,对粉煤灰改良硫酸盐渍土的抗剪强度特性进行了研究.结果表明:在试验掺量范围内,黏聚力c随着硫酸盐含量的增加先减小后增大,而内摩擦角φ变化不显著;在试验掺量范围内,在硫酸盐渍土中掺入粉煤灰可以提高其强度,且粉煤灰掺量越大,强度越高.该研究可为硫酸盐渍土地区工程建设提供借鉴和参考.

Aiming at solving the problem of lower shear strength and the poor engineering application for sulphate saline soil in northwest inland arid area. The shear strength properties of sulphate saline soil improved by different contents of fly ash were studied under unconsolidation and undrained triaxial shear test. The results show that the cohesion c decreases firstly and then increases with the increasing content of sulphate, while the friction angle φ changes slightly in the range of test content. And within the range of test content, the strength of sulphate saline soil is improved by adding fly ash and the strength is heightened when the increasing of fly ash. The research can provide references to construction in sulphate saline soil area.