降雨对凝灰岩高边坡稳定性影响及防护措施分析

Analysising and Protection Measures of the Rainfall Effect on Stability of Tuff High Slope

凝灰岩遇水会软化、崩解,因此凝灰岩高边坡稳定性受降雨影响大。结合高边坡稳定性已有研究理论和广东省某高速公路改扩建项目中凝灰岩高边坡工程实例,阐述了分布于广东地区的凝灰岩工程特性,分析了受降雨影响后凝灰岩高边坡失稳的破坏机理,发现降雨是导致凝灰岩高边坡失稳破坏的主要原因,阻止雨水入渗是确保凝灰岩高边坡稳定的关键;通过对比分析工程实例中三次变更方案内容,结合各个方案实施后的结果分析了各方案特点;结合工程实例,对凝灰岩高边坡设计、阻止雨水入渗措施、采取合理防护等稳定措施进行了工程经验总结。

The tuff in water will be softening and disintegration, so the stability of high slope influenced by the rainfall. Combining the existed theory concerned the stability of high slope and making tuff high slope of Guangdong province expressway extension project as an engineering example, the engineering characteristics of tuff in the Guangdong area are expounded and the destruction mechanism of tuff high slope because of raining is analysed. Stopping the rain infiltration is found to be the key to ensure the tuff slope stability, comparing three solutions of tuff high slope in the instance. Engineering experiences of designing tuff high slope, preventing the rain infiltration and adopting the reasonable supporting measures are concluded.