植被混凝土边坡泥沙侵蚀室内试验研究  

Laboratory Test Study on Sediment Erosion of Vegetation Concrete Slope

作　　者：李灿 周海清 赵尚毅 王庆鑫 彭岳 LI Can;ZHOU Haiqing;ZHAO Shangyi;WANG Qingxin;PENG Yue(Army Logistics University,Chongqing Key Laboratory of Geomechanics&Geoenvironment Protection,Chongqing 401311,China;Chongqing University of Science and Technology,Chongqing 401311,China;China Construction Tunnel Co.,Ltd.,Chongqing 401147,China)

机构地区：[1]陆军勤务学院军事设施系岩土力学与地质环境保护重庆市重点实验室,重庆401331 [2]重庆科技学院,重庆401311 [3]中建隧道建设有限公司,重庆401147

出　　处：《兵器装备工程学报》2019年第8期231-236,共6页Journal of Ordnance Equipment Engineering

基　　金：国家自然科学基金项目(51408603);重庆市基础研究与前沿探索项目(CSTC2018JCYJAX0373);重庆市自然科学基金项目(cstc2017shmsA0581);重庆市国土资源和房屋管理局科技计划项目(KJ-2017019);中建股份科技研发项目(CSCEC-2017-Z-24)

摘　　要：开展了边坡模型室内冲刷试验,进行包括1∶0.75、1∶1和1∶1.25等3个不同边坡坡率,1.9、2.4和2.9 L/min等3个不同降雨强度共计9组,在降雨历时60 min下进行室内冲刷模拟试验;统计了每组试验的泥沙侵蚀量,分析了坡面在雨水冲刷作用下的侵蚀过程、探讨了泥沙侵蚀量与降雨历时、降雨强度和坡率的关系。试验结果表明:植被混凝土边坡坡面侵蚀主要停留在层状面蚀阶段,局部区域存在细沟侵蚀;泥沙侵蚀累计量在降雨初期增加速度快,用表达式y=a+b ln(x+c)很好反应泥沙侵蚀累积量与降雨历时的关系;泥沙侵蚀量随着降雨强度和坡率的增加而增加,呈线性关系,临界坡度大于53°。通过以试验结果,能够为工程作出一定的理论指导,同时发现植被混凝土边坡在施工初期具备良好的抗雨水冲刷能力,是优秀的边坡生态防护技术手段。This paper carried out the indoor scouring test of the slope model.Three different slope rates including 1∶0.75,1∶1 and 1∶1.25,and three different rainfall intensities,such as 1.9,2.4 and 2.9 L/min,were performed in 9 groups.The indoor scouring simulation test was carried out under rainfall for 60 min;the amount of sediment erosion in each group of experiments was calculated;the erosion process of slope surface under the action of rain erosion was analyzed;the relationship between sediment erosion and rainfall duration,rainfall intensity and slope rate was discussed.The test results show that the slope erosion of vegetation concrete slope mainly stays in the layered surface erosion stage,and there is rill erosion in the local area;the cumulative amount of sediment erosion increases rapidly in the early stage of rainfall,and the relationship between sediment accumulation and rainfall duration can be well reflected by the expression y=a+b ln(x+c);the amount of sediment erosion increases with the increase of rainfall intensity and slope rate,and the overall increase is linear.The critical slope is greater than 53°.Through the test results,we can make some theoretical guidance for the project,and at the same time find that the vegetation concrete slope has good anti-rain erosion ability in the initial stage of construction,and it is an excellent technical protection technology for slope ecological protection.

关 键 词：植被混凝土 坡面侵蚀 泥沙侵蚀量 模型试验 

分 类 号：TU42[建筑科学—岩土工程]