胶结土无侧限抗压强度试验研究

Experimental study on unconfined compressive strength of cemented soil

现今在水利工程上通过掺入胶凝材料来消除粉质黏土的时效性,改善粉质黏土的性能,以便更好地用于实际工程中。本文通过单掺、双掺及三掺胶凝材料(水泥、石灰、粉煤灰)对粉质黏土进行改性,并分别养护7 d、14 d、28 d后进行无侧限抗压试验,分析了粉质黏土改性后的无侧限抗压强度的变化规律。试验结果表明:(1)改性后的粉质黏土无侧限抗压强度随胶凝材料的掺量增多而增大;(2)改性后的粉质黏土无侧限抗压强度随养护龄期的增长而增大,但增大趋势随养护龄期的增长而减小;(3)掺入3%水泥、1.5%石灰和1.5%粉煤灰是改性粉质黏土的最佳配制方法。本文试验方法和试验结果可为今后粉质黏土的改性起一定的借鉴作用。

At present,in water conservancy projects,the time-effectivenesst of silty clay is eliminated by adding cementing materials,and the properties of silty clay are improved,so as to be better used in practical projects.In this paper,silty clay was modified by single,double and three-admixture cementite materials(cement,lime and fly ash),and unconfined compression tests were carried out after curing for 7 d,14 d and 28 d respectively to analyze the variation rule of unconfined compressive strength of the modified silty clay.The results show that:(1)the unconfined compressive strength of the modified silty clay increases with the increase of the amount of cementing material;(2)the unconfined compressive strength of the modified silty clay increases with the increase of the curing pried,but the growth trend decreases with the increase of the curing pried;(3)adding 3%cement,1.5%lime and 1.5%fly ash is the best preparation method for modifying silty clay.The test methods and results in this paper can be used for reference in the modification of silty clay in the future.