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简要论述了非饱和膨胀土的工程特性,对膨胀土边坡的失稳机理进行了初步探析。结合工程实例,在室内试验和现场勘查的情况下,利用岩土工程数值分析软件ANSYS和FLAC,引入膨胀土膨胀力的作用,分析了高速公路膨胀土路堤边坡出现的路面开裂和边坡失稳问题,同时指出雨水对膨胀土边坡稳定性影响很大,特别是在路面出现较长纵向裂缝的情况下。分析结果表明,用ANSYS和FLAC软件都可以自动模拟出边坡失稳的滑移面,但FLAC的模拟结果较ANSYS更与现场情况相吻合。最后指出,该路段的膨胀土边坡处于不稳定状态,需要进行边坡加固治理。
The engineering characteristics of unsaturated expansive soil are briefly discussed, and the instability mechanism of expansive soil slope is preliminarily analyzed. Combined with the engineering example, the effect of expansive force of expansive soil was introduced by using the numerical analysis software ANSYS and FLAC in the laboratory test and site investigation, and the pavement cracking and slope loss of expansive soil embankment slope were analyzed At the same time, it is pointed out that rainwater has a great influence on the stability of expansive soil slopes, especially in the case of long longitudinal cracks in pavement. The analysis results show that the slip surface of slope is simulated automatically by ANSYS and FLAC software, but the simulation results of FLAC are more in line with the situation of ANSYS. Finally, it is pointed out that the expansive soil slope in this section is in an unstable state and needs to be treated by slope reinforcement.