肯尼亚蒙巴萨地区膨胀土特性试验与边坡防护研究

Research on Characteristics of Expansive Soil and Slope Protection in M ombasa,Kenya

本文通过室内膨胀率试验和剪切试验,探究了肯尼亚蒙巴萨地区重塑膨胀土的膨胀特性和抗剪强度特性,分析了初始含水率、初始干密度及干湿循环效应对其特性的影响,并提出针对该地区膨胀土边坡防护工程的相关建议。研究表明:(1)随膨胀土初始干密度的增加,膨胀率呈线性关系增大,黏聚力呈指数关系增大;(2)随膨胀土初始含水率的增加,膨胀率呈分段线性关系降低,黏聚力和内摩擦角呈线性关系降低;(3)干湿循环效应使得土体黏聚力出现大幅度的衰减。

In this paper,the expansion characteristics and shear strength characteristics of remolded expansive soil in Mombasa,Kenya were investigated through laboratory expansion rate test and shear test,and the influences of initial moisture content,initial dry density and dry-wet cycle effect on its characteristics were analyzed,and some suggestions were put forward for slope protection engineering of expansive soil in this area.The results show as follows:(1)with the increase of initial dry density of expansive soil,the expansion rate increases linearly,while the cohesion increases exponentially.(2)With the increase of initial moisture content of expansive soil,the expansion rate decreases in piecewise linear relationship,while the cohesion and internal friction angle decrease in linear relationship.(3)The dry-wet cycle effect makes the cohesive force of the soil mass decrease greatly.