重塑膨胀土膨胀特性变化规律的试验研究

Experimental Study on Variation Regularity of Swelling Properties of the Remolded Expansive Soils

对南水北调中线南阳中膨胀土重塑样进行了不同初始含水率和干密度下的膨胀力试验和有荷条件下的膨胀率试验,研究了南阳中膨胀土极限膨胀力与初始含水率和干密度、膨胀率与上覆压力之间的规律关系,并建立了能够系统考虑初始含水率和干密度耦合变化的膨胀力与允许膨胀变形关系的计算公式,对科学认识膨胀土性质、优化相关设计具有重要的理论和实践价值。

A series of swelling force tests in the condition of different initial water contents and dry densities as well as the expansion ratio tests under different vertical loads were conducted for Nanyang remolded expansive soils to investigate the variation regularity of the maximum swelling pressure and expansion ratio under different initial water contents,dry densities and vertical loads. Then,a calculation formula for the relationship between swelling force and swelling deformation was established,which could consider the variations of initial water content and dry density simultaneously. It is very significant theoretical and practical values to acknowledge properties of expansive soils and optimize certain designs scientifically.