粉砂土掺量对膨胀土膨胀与力学特性的影响

以河南省新乡地区某处膨胀土为研究对象,利用当地广泛分布的粉砂土对其进行改良,通过室内实验,研究不同粉砂土掺量对改良土膨胀特性及力学特性的影响.实验结果表明:随着粉砂土掺量的增加,无荷载和有荷载膨胀率在粉砂土掺量小于30％时快速下降,大于30％时缓慢下降;膨胀力随粉砂土掺量增加呈先缓慢下降后加速下降再缓慢下降的趋势;改良...

Study on the Influence of the Amount of Silty Sand on the Expansion and Mechanical Properties of Expansive Soil

Study on expansive soil somewhere in Xinxiang area of Henan Province, the expansive soil was improved by using the widely distributed silt soil. Through laboratory experiments, the effects of different silt content on the expansion characteristics and the mechanical properties were studied. Experimental results show that: With the increase of the amount of silty sand, the no-load expansion ratio and the load expansion ratio decrease rapidly when the amount of silt is less than 30%, and decrease slowly when it exceeds 30%. The expansion force decreases slowly with the increase of silt content, then accelerates and then decreases slowly. The improved soil cohesion reaches the maximum when the amount of silt is 10%, and then decreases rapidly with the increase of the amount of silt. The internal friction angle increases linearly with the increase of the amount of silt. When the amount of silt is 20%, the unconfined compressive strength increases to the maximum, and then the amount of silt increases gradually decreases, and the rate of decrease is slower and then slower. Different content of silty sand has great influence on the expansion and mechanical properties of expansive soil, which can significantly improve the performance of expansive soil.