摘要
采用饱和-非饱和渗流有限元计算理论,建立一维、二维模型,对不同降雨强度、土质类型、表面吸力以及边坡坡度下的边坡降雨入渗深度和饱和区变化规律进行研究。研究结果表明:对于同种土质而言,初始表面吸力越小,降雨入渗深度越大,降雨入渗深度从大至小对应的土质依次为粉土、砂土和黏土;在降雨过程中,黏土在降雨入渗深度范围内均为饱和区域,而粉土则先在入渗深度范围内出现饱和区,随后饱和区域消散,砂土首先在降雨入渗范围内形成饱和区,随后饱和区下移形成悬挂式饱和区;边坡坡度越大,边坡底部的降雨入渗深度越大,粉土边坡受坡度影响更明显;在降雨作用下,当初始表面吸力为100 k Pa时,砂土边坡表面生成饱和区,随后饱和区扩大并下移;而当初始表面吸力为10 kPa时,降雨会导致粉土边坡地下水位上升。
1-D and a 2-D models were established to analyze the variation of rainfall infiltration depth and saturation zone of slope with different rainfall conditions,soil types,surface matric suctions and slope ratios based on the finite element calculation theory of saturated-unsaturated seepage.The results show that soil with smaller initial surface suction has greater rainfall infiltration depth,and silt,sand and clay follow the large-to-small order in the rainfall infiltration depth.During rainfall process,the clay is saturated in the rainfall infiltration area,while silt is saturated in the infiltration area at first and then the saturation zone dissipates.As for sand,the saturation zone forms in the rainfall infiltration area 453 firstly,then it moves down and forms a suspended saturation zone.The greater slope ratio leads to greater rainfall infiltration depth in the middle and bottom of slope,and the influence of the slope ratio on the silty slope is more obvious.Under the action of rainfall,the saturation zone forms on the surface of sandy slope and then it expands and moves down.The silt slope with small initial surface suction will directly lead to the increase of groundwater level under rainfall.
作者
刘杰
曾铃
付宏渊
史振宁
张永杰
LIU Jie;ZENG Ling;FU Hongyuan;SHI Zhenning;ZHANG Yongjie(Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road&Traffic Safety of Ministry of Education,Changsha University of Science&Technology,Changsha 410114,China;School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第2期452-459,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51838001
51878070
51578079
51678074)
湖南省教育厅优秀青年基金资助项目(17B013
15B103)
湖南省研究生科研创新项目(CX2018B528)
长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj170404)~~
关键词
土质边坡
降雨入渗
入渗深度
饱和区
soil slope
rainfall infiltration
infiltration depth
saturation zone
