【摘要】 膨胀土的抗剪强度受水与气候影响较大。在膨胀土边坡表面一定深度范围内，遭遇强降雨时抗剪强度降低，极易发生表层溜塌和浅层破坏。本文以合肥地区膨胀土为研究对象，通过室内三轴试验，开展膨胀土在不同防护浸润条件下的强度特性研究。结果表明:采用表面刷浆保护后试样的抗剪强度下降幅度较小;在雨水浸润后，表层膨胀土的抗剪强度显著降低，边坡稳定安全系数也会大幅减小;而在进行喷浆护坡或换土处理后，膨胀土边坡稳定性得到大幅提高，采用喷浆护坡、换土法等表面防护能有效地提高膨胀土边坡稳定性。更多还原

【Abstract】 The shear strength of expansive soil is greatly affected by water and climate. Within a certain depth of the surface of the expansive soil slope,the shear strength decreases when the slope is subjected to heavy rainfall,and the surface slip and shallow failure are easy to occur. In this paper,the indoor three-axis test is carried out to observe the strength characteristics of expansive soil in Hefei area under different protective and infiltration conditions. It was found that the decrease of shear strength of the specimen with surface brush protection is small; the stability analysis of expansive soil slope shows that after the infiltration of rainwater,the shear strength of the surface expansive soil is significantly reduced,and the safety factor of the slope stability is also greatly reduced; however,the stability of expansive soil slopes has been greatly enhanced after the shotcrete or soil replacement,the stability of expansive soil slope can be effectively improved by using the surface protection methods such as shotcrete slope protection and soil replacement.更多还原