大气影响带对膨胀土边坡稳定的影响及对策

以南水北调中线南阳某段膨胀土渠坡工程为依托,针对大气影响带深度对膨胀土边坡的影响及应对措施,采用GTS-NX岩土有限元数值计算软件建立有限元模型并进行边坡抗滑稳定分析。结果表明,当大气影响急剧层深度大于1.0 m后,边坡安全系数明显下降,当深度到达2.0 m,边坡接近极限平衡状态,水泥改性土换填厚度宜取2.0 m。

Impact from atmospheric influence zone on stability of expansive soil slope and its countermeasures

Based on the project of the expansive soil channel slope of a section of Nanyang within the Mid-Route of the South-to-North Water Transfer Project, a finite element model is established with the GTS-NX geotechnical numerical calculation software, and then the anti-slide stability of the slope is analyzed in allusion to the impact from the depth of the atmospheric influence zone on the expansive soil slope. The result shows that if the sharp layer depth of atmospheric influence is over 1.0 m, the safety factor of the slope is obviously decreased, while if the depth reaches 2.0 m, the slope approaches a limit equilibrium state, for which the thickness of 2.0 m is appropriate to be taken for the replacement with the cement-modified soil.