厚层基材植物防护在红色粉砂岩边坡的应用

Application of Plant Protection of Thick-layer Backing in Red Siltstone Slope

为岩质边坡应用植物防护提供理论依据和应用经验,结合湖北荆宜高速公路红色粉砂岩路堑边坡采用厚层基材植物防护的科研实例,采用Mont-Carlo随机模拟、室内外试验等方法,在对红色粉砂岩岩性、稳定性进行分析的基础上,研究了红色粉砂岩边坡采用厚层基材植物护坡的可行性、厚层基材植物护坡的动态机制、护坡植物选择和基材层的设计。结果表明:正常工况下红色粉砂岩边坡较稳定,但在降雨条件下冲蚀严重,稳定性降低;研究区雨水充分,岩体内部微裂隙发育,导水性强,能够提供植物生长的养分和水分,为厚层基材植物护坡提供了良好的环境;护坡过程的第3阶段为植物护坡正常、理想的工作阶段,厚层基材植物护坡能达到功能、环境和视觉的统一效应,植物的选择及基材的设计是关键;实践证明,在红色粉砂岩边坡应用厚层基材植物防护是可行的,可以大规模推广。

In order to provide theoretical basis and experiences of application about plants protection in rock slopes, in combination with the project of the application of plant cut slope protection of thick-layer backing in red sihstone slope of Jingmeng-Yichang expressway in Hubei Province, by applying Mont-Carlo simulation and tests of indoor and outdoor, the feasibility and dynamic mechanism of the plant slope protection of thick-layer backing, the selection of plant kinds and design of slope protection material were discussed based on analysis of the lithology and stability of the rock slope. The results show that （1） the slope is stable under normal condition, but there is severe slope erosion and landslide which result in stability reduction under rainfall condition; （2） there is sufficient rainfall in the study area, and there are small cracks growth in rock mass, and the red siltstone has strong absorbing water to provide nutrients and moisture for plant growth, so these provide a good environment for plant slope protection of thick-layer backing; （3） the third stage is ordinary and ideal work stage in protection process, and reaches uniform effect of function, environment and sight, the selection of plant kinds and the design of slope protection material are essential; Plant slope protection of thick-layer backing deserves to be popularized because practice has proved that it is applicable to apply the technology in red siltstone.