桂东南花岗岩残坡积土边坡破坏特征与防治对策

桂东南花岗岩残坡积土边坡雨季频繁失稳破坏,严重威胁着当地居民的生命财产与工程安全,制约区域经济社会的发展。为了探明该类边坡的破坏特征,采用现场调研与统计分析相结合的方法,分析了花岗岩残坡积土边坡的破坏模型与特征,探讨边坡稳定性的主要影响因素,在此基础上提出针对性的防治对策。研究结果表明:桂东南花岗岩残坡积土边坡的破坏类型分别是滑坡、崩塌、坡面泥石流、复合型,边坡稳定性的主控因素包括残坡积土的力学性质、结构面、人工切坡与降雨。防治设计宜分别针对自然边坡与人工边坡来开展,对于已经破坏的自然边坡和人工边坡,防治重点是对裸露的滑床进行及时防护;对于正处于变形阶段的人工边坡,防治宜根据坡体结构、边坡稳定性、潜在的破坏类型与特征来采取针对性措施。

Failure Characteristics and Prevention Measures of Granite Residual Soil Slope in the Southeast of Guangxi Province, China

The failures of granite residual soil slopes in the southeast of Guangxi Province are characterized with the frequent occurrence in rainy season, thus posing the great threats to the local residents of life, property and engineering safety, meanwhile, hindering the regional economic development. In order to understand the failure characteristics of granite residual soil slope, field surveys and statistical analysis were used to analyze the failure types, features, and the major influencing factors of slope stability. Then the corresponding prevention measures were given in this paper. Results show that four failure types of granite residual soil slopes are summarized as landslide, collapse, slope mudslides and composite failure. The main control factors of slope stability include mechanical properties, structure plane, artificial slope cutting and rainfall. Based on the nature slope and artificial slope, prevention and control design should be carried out. The prevention measure for destroyed nature and artificial slope focuses on the protection on the bare sliding bed. For preventing the unstable artificial slope, structure of slope, slope stability, potential failure types and characteristics of slope should be taken into account.