入渗对冰碛物滑坡的稳定性影响分析
文献类型：学位论文
| 作者 | 黄金辉 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院研究生院 |
| 授予地点 | 北京 |
| 导师 | 程尊兰 |
| 关键词 | 入渗 冰碛物 冰碛物滑坡 稳定性分析 水文响应 稳定性系数 |
| 其他题名 | Influence of Infiltration on the stability of Moraine slopes |
| 学位专业 | 岩土工程 |
| 中文摘要 | |
| 英文摘要 | Infiltration trigged by rainfall， rising river or snowmelt of glacier causes moraine slopes in middle and high latitudes of mountains to fail， which results in grave loss of life and property. Research on the influence of infiltration on moraine slopes helps scientifically establish a landslide warning system and methods of disaster prevention and mitigation. Based on the study of previous frameworks， experiments and numerical analysis on moraine slopes in Tibet， this paper gets the following conclusions. （1） Tills usually exhibit a multimodal grading curve， and fine particles like clay makes sand， gravels or stones dense. Triggering conditions like rainfall， snowmelt， etc render the ground moraines loose and develop open structure， then infiltration rate increases. （2） Indeed， infiltration is a progress of soil water movement. Driven by gravity and suction， phreatic line moves forward and water content redistributes along with infiltration. Water content decreases nonlinearly with the increase of depth at the same time， while water content is concerned with infiltration rate and hydraulic conductivity of upper soil. With the infiltration， redistributions of water content produces local transient saturation zone where suction reduces to 0. The theoretical analysis which corresponds to tracer test indicates water inside the slope migrates to toe. （3） Reduction of soil suction caused by water redistribution brings about the changes of shear strength. Experiments reveal cohesion of tills lowers in exponential model with water content， and decay more quickly when water content is between 0% and 10%. In general， friction angle of moraines shows a declining trend with water content， but has no obvious relationships. （4） Slope stability analysis with hydraulic response trigged by infiltration on moraine slope show that factor of safety decreases along with infiltration， factor of safety of local transient saturation zone becomes 0.916， and finally slope fails. Use of in conjunction with unsaturated soil shear strength put forward by Frelund and theoretical framework by Iverson， failure criterion Fs（Z，t） containing suction is derived. |
| 语种 | 中文 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/8009]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 推荐引用方式 GB/T 7714 | 黄金辉. 入渗对冰碛物滑坡的稳定性影响分析[D]. 北京. 中国科学院研究生院. 2014. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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