| 题名 | 降雨作用下地震扰土体滑坡形成机理 |
| 作者 | 裴来政 |
| 学位类别 | 博士 |
| 答辩日期 | 2011-05-20 |
| 授予单位 | 中国科学院研究生院 |
| 授予地点 | 北京 |
| 导师 | 崔鹏 |
| 关键词 | 汶川地震 降雨滑坡 模型试验 人工降雨 数值模拟 |
| 其他题名 | Research on the Landslide Mechanism of Damaged Soil Triggered by Rainfall After Wenchuan Earthquake |
| 学位专业 | 岩土工程 |
| 中文摘要 | 本文以汶川地震灾区震后降雨滑坡为研究对象，在对灾区震后降雨滑坡进行现场调查基础上，分析震前震后滑坡发育条件差异、震后降雨滑坡的类型和活动特征；通过人工降雨的滑坡模拟实验，分析震后松散土体降雨作用下滑动过程以及降雨入渗作用下土体内部含水量和孔隙水压力的变化；通过数值模拟方法，分析震后在降雨条件下裂隙的存在对边坡降雨入渗和边坡稳定性的影响；通过对震后北川魏家沟源头滑坡位移监测，分析目前魏家沟源头滑坡的滑动特点及震后降雨与滑坡位移的关系。本文取得的主要成果如下： （1）通过地震灾区的现场调查，阐述了汶川地震中地表破坏情况。针对汶川地震震后滑坡明显比震前活跃的特点，分析了汶川地震震后滑坡发育条件与地震前的差异。（2）在对震后地震灾区降雨滑坡调查的基础上，分析了震后降雨滑坡的类型和活动特征，对于震后的两类典型坡体——表层震松坡体和震裂坡体，初步分析其在降雨作用下形成滑坡的过程。（3）通过人工降雨的模拟实验，分析震后松散土体降雨作用滑坡形过程和机理。 （4）通过基于Geo-Slope中的SEEP/W模块中进行降雨作用对裂隙边坡稳定性影响的数值模拟。 （5）通过对震后北川魏家沟源头滑坡的位移监测表明，目前魏家沟滑坡体的滑动位移量主要体现在滑坡体的上部表层10m内，特别是表层5m内的位移量较大。通过分析位移与降雨量的关系表明，降雨直接加速了滑动，特别是加剧了滑坡体中上部表层10m的位移。 |
| 英文摘要 | Rainfall-induced landslides after the Wenchuan earthquake generally seriously endanger and prevent the restoration and reconstruction of the extremely quake-hit areas. It is very crucial to discover the characteristics of rainfall-induced landslides and research on mechanism of rainfall-induced landslides in hit-areas after the Wenchuan Earthquake. Through the field investigation of rainfall-induced landslides, artificial rainfall landslide model test of the loose earth , numerical analysis of stability of crack slopes and displacement monitoring of the weijiagou landslide ,the author studied the mechanism of landslides under the action of rainfall. This main achievements were as follows: (1) Through field investigation in the earthquake areas, the destruction surface conditions induced by wenchuan earthquake was described. Because the landslide was more active than before the wenchuan earthquake, different development conditions of landslide was analyzed between after the Wenchuan earthquake and before the earthquake. (2) Based on the investigation of rainfall-induced landslides after the Wenchuan earthquake,the types and active characteristic of rainfall-induced landslides were anslysised.Aimed at two typical landslides-surface shaked lossen earth slope and crack slope,the process of landslide under the actionof rainfall was narrated. (3) Through the model test under the artificial simulated rainfall, the process and mechanism of landslide were analysised. (4) Used the SEEP / W module in the software Geo-Slope- to analysis the stability of crack slope. (5) Displacement monitoring of weijiarou landslie showed that the sliding speed in the upper surface of 10m is more quickly ,especially in the upper surface of 5m.By analyzing the relationship between displacement and rainfall, It was condluded that rainfall directly accelerate the slide of weijiagou landslide., particularly in the upper surface of 10m . |
| 语种 | 中文 |
| 公开日期 | 2013-02-02 |
| 内容类型 | 学位论文 |
| 源URL | [http://192.168.143.20:8080/handle/131551/4878]  |
| 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 | 裴来政. 降雨作用下地震扰土体滑坡形成机理[D]. 北京. 中国科学院研究生院. 2011. |
| 个性服务 |
| 查看访问统计 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论