水泥改性膨胀土在侵蚀环境下的干湿循环效应研究

Effect of Dry Wet Cycle on Cement Modified Expansive Soil under Erosion Environment

为了研究水泥改性膨胀土在复杂环境条件下的稳定性及耐久性,设计了室内模拟试验,探讨了纯净水、不同浓度及不同种类的化学溶液在干湿循环作用下对水泥改性膨胀土的侵蚀效应。从初始至破坏状态,记录了试样的宏观裂隙开展过程及体积的变化情况,对比分析了相应的荷载位移曲线及峰值强度,得到了水泥改性膨胀土在不同侵蚀环境下的力学特性随干湿循环次数的变化规律,并对相应的作用机理进行了分析。试验结果表明,侵蚀环境的干湿循环作用对水泥改性膨胀土的力学特性有明显的影响,且随着侵蚀溶液的浓度和干湿循环次数的递增而变得愈加显著。

In order to study the cement modification of expansive soil stability and durability in a complex environment, the indoor simulation experiment design of pure water, different concentration and different kinds of chemical solution under cyclic drying and wetting of cement modified expansive soil erosion effect. From the initial to the failure state, recorded the changes in the development of process and volume of macro fracture sample, comparative analysis of the load displacement curve and the peak intensity of the obtained mechanical properties of expansive soil under different erosion conditions changes with the cycle number of cement, and the relevant mechanism is analyzed. The results show that the wetting and drying cycle of the corrosion environment has obvious influence on the mechanical properties of the modified expansive soil.