多雨气候条件下膨胀土路堑边坡处治技术研究

为解决海南多雨气候条件下膨胀土路堑边坡破坏的问题，以海口至屯昌高速公路膨胀土路段为依托，分别开展了现场边坡破坏调查、室内试验、计算分析、方案设计及实体工程修筑。根据边坡破坏特征将海屯高速公路膨胀土路堑边坡分为三种类型，对发生滑坡和滑坍的边坡，提出了土工格栅加筋+综合防排水+坡面绿化的柔性加固方案，对发生坡面冲刷水毁的边坡，提出了坡面三维植草+平台渗沟+坡顶封闭的柔性防护方案，并通过渗流和边坡稳定性计算以及工程应用，分析了两种膨胀土路堑边坡处治技术的有效性和实用性。

Study on Treatment Technology for Expansive Soil Cut Slopes under Rainy Climate Condition

In order to solve the failure of expansive soil cut slopes under rainy climate condition, taking the expansive soil section of Haikou-Tunchang Highway as an example, field investigation on slope failure, laboratory tests, computation analysis, treatment design and construction of physical works were carried out. According to the characteristics of slope failure, the expansive soil cut slopes along the Highway were classified into three types and, in relation to the slopes where landslide and collapse arose, a flexible reinforcement technology which combined geogrid reinforcement, comprehensive waterproof and drainage, and greening was proposed; in relation to the slope where surface erosion and water damage arose, a flexible protection technology which combined three-dimension vegetative net, platform blind ditch and slope top blocked was proposed. Moreover, seepage analysis, calculation of slope stability and engineering practice were carried out to analyze the practicality and effectiveness of these two treatment technology.