膨胀土堑坡雨水入渗速率的影响因素与相关性分析  

Effects and correlation analysis of infiltration velocity of expansive soil cut slope

作　　者：李雄威[1,2] 孔令伟[1] 郭爱国[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]常州工学院土木建筑工程学院,常州213002

出　　处：《岩土力学》2009年第5期1291-1296,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.10872210);中国科学院知识创新工程重要方向项目(No.kzcx2-yw-150);交通部西部交通建设科技项目(No.200631878530)

摘　　要：从土体初始含水率和降雨强度2个影响因素出发,通过现场试验分析了膨胀土堑坡雨水入渗速率的变化特性。试验结果表明,对于膨胀土堑坡,一定雨强连续的降雨才能使水分持续有效的入渗;土体含水率的变化主要取决于降雨的历时,而不是降雨强度。雨水入渗过程中,随着土体初始含水率的降低,坡面侵蚀程度有所降低。降雨强度较小时,雨水对坡面侵蚀不大;随着降雨强度的增加,坡面侵蚀逐渐加剧,但侵蚀程度逐渐收敛。植被的存在会改善土体的渗透性,同时也将大大降低雨水对坡面的侵蚀。From the viewpoints of considering the two effects of initial water content and rainfall intensity, infiltration velocity characteristics of expansive soil cut slope is studied through the field test. The results show that the water can infiltrate effectively only under the condition of successive rainfall in a certain intensity. The water content variety of slope is controlled by the successive time of rainfall, but not the intensity. The erosion amount is decreased with the reduction of water content. When the rainfall intensity is small, the rainfall makes little erosion on the slope surface. The erosion amount increases with the enhancement of rainfall intensity, but the value is gradually convergent. When the slope is covered by vegetation, the permeability is strengthened, but the erosion scale is lightened greatly.

关 键 词：膨胀土堑坡 裂隙 雨水入渗 侵蚀 

分 类 号：TU411[建筑科学—岩土工程]