Process of rainfall infiltration of residual slope considering the effect on initial seepage field(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年05期
- Page:
- 39-48
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Process of rainfall infiltration of residual slope considering the effect on initial seepage field
- Author(s):
- HE Zhong-ming; QIU Xiang; BIAN Han-bing; ZENG Ling
- 1. Key Laboratory of Special Environment Road Engineering of Hunan Province， Changsha University of Science & Technology, Changsha 410004, Hunan, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, Hunan, China; 3. Laboratory for the Study of Microstructures and Materials Mechanics, University of Lorraine, Metz 57070, Lorraine, France
- Keywords:
- road engineering; transient saturated zone; initial seepage field; rainfall infiltration; pore water pressure; water content
- PACS:
- U417.2
- DOI:
- -
- Abstract:
- In order to study the influence of initial seepage field distribution on rainfall infiltration of residual slope. Based on the theory of saturated unsaturated seepage, and adopting by finite element numerical simulation method which can simultaneously consider saturated seepage and unsaturated seepage, the infiltration process of slope under the influence of four initial seepage fields is simulated, respectively. The results show that during rainfall, infiltration zone pore water pressure, the response time of moisture content, and time to reach transient saturated zone is inversely proportional to the distance from the slope, while the length of the transient saturated zone and the rate of increase are proportional to the intensity of the rainfall. After the rain, transient saturated zone pore water pressure and the time required for the dissipation of water content are proportional to the intensity of rainfall. Pore water pressure and water content between infiltration affected zone and transient saturated zone increase firstly and then decrease slowly. Water pressure and water rates remain unchanged outside the infiltration effect zone. Rain will cause the increase of pore water pressure and moisture content of in side slope, and its increase magnitude is directly proportional to rainfall intensity. Under the same condition of rainfall intensity, the greater the initial matric suction, the more difficult the rainwater infiltration. Under the same maximum initial matric suction and the different distribution of initial seepage field, the rain is harder infiltrating to the slope whose initial seepage field is horizontal contour distribution. During rainfall, the appeared time, depth and area is proportional to rainfall intensity. After the rain, depth and area of transient saturated zone gradually dissipate. Pore water pressure, water content and distribution of transient saturated zone of slope are closely related to rainfall intensity, the maximum matrix suction of initial seepage field and the distribution form. The prerequisite for infiltration process of slope rainfall is to select an appropriate initial seepage field.
Last Update: 2017-10-16