| 灌溉作用下浅表层黄土滑坡变形破坏机理实验研究 |
| |
| 引用本文： | 王刚,孙萍,吴礼舟,石伦炎,祝恩珍.灌溉作用下浅表层黄土滑坡变形破坏机理实验研究[J].地质力学学报,2017,23(5):778-787. |
| |
| 作者姓名： | 王刚 孙萍 吴礼舟 石伦炎 祝恩珍 |
| |
| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;国土资源部新构造运动与地质灾害重点实验室, 北京 100081,中国地质科学院地质力学研究所, 北京 100081;国土资源部新构造运动与地质灾害重点实验室, 北京 100081,成都理工大学地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059,成都理工大学地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059,中国地质科学院地质力学研究所, 北京 100081;中国地质大学(北京)地球科学与资源学院, 北京 100083 |
| |
| 基金项目： | 国家自然科学基金项目（41472296，41672282）；中国地质调查项目（DD20160271） |
| |
| 摘 要： | 为有效减少泾阳地区大面积灌溉活动诱发黄土滑坡对社会和经济带来的巨大损失,开展灌溉型滑坡室内实验研究,研究坡度在灌溉条件下对黄土滑坡变形破坏过程影响,具有重大的现实意义。本次实验设计了可用于坡顶和坡面的灌溉装置,同时进行了45°斜坡和60°斜坡的两组室内灌溉模型实验,且每组斜坡内埋设体积含水率传感器、基质吸力传感器和孔隙水压力传感器三种传感器记录其内部变化。通过对两组实验过程及结果进行对比分析,进而得出灌溉条件下浅表层黄土滑坡的变形破坏规律,总结出该类滑坡的破坏模式及其诱发机理。实验结果表明,实验前期随着体积含水率不断增大,基质吸力逐渐减小至基本稳定,土体强度随之减小;实验后期上部土体饱和,斜坡产生的变形和土体排水不畅产生了超孔隙水压力,有效应力随之减小,土体强度减小至最小,导致滑坡产生。同时,坡度越大,滑坡越易发生,滑面深度和滑动距离越小。
|
| 关 键 词： | 黄土斜坡 灌溉 滑坡 物理模型实验 孔隙水压力 |
| 收稿时间： | 2016/12/11 0:00:00 |
EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE MECHANISM OF SHALLOW LOESS LANDSLIDE UNDER THE EFFECT OF IRRIGATION |
| |
| WANG Gang,SUN Ping,WU Lizhou,SHI Lunyan and ZHU Enzhen.EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE MECHANISM OF SHALLOW LOESS LANDSLIDE UNDER THE EFFECT OF IRRIGATION[J].Journal of Geomechanics,2017,23(5):778-787. |
| |
| Authors: | WANG Gang SUN Ping WU Lizhou SHI Lunyan and ZHU Enzhen |
| |
| Institution: | Institute of Geomechanics, Chinese Academy of Geological sciences, Beijing 100081, China;Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological sciences, Beijing 100081, China;Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China,State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China and Institute of Geomechanics, Chinese Academy of Geological sciences, Beijing 100081, China;Chinese Academy of Geological sciences, China University of Geosciences, Beijing 100083, China |
| |
| Abstract: | In order to effectively reduce the enormous losses to society and economy caused by shallow loess landslides triggered by irrigation in large area of Jingyang, it is of great realistic significance to carry out laboratory experimental study on irrigation-induced landslides and to study the effects of slope gradient on deformation and failure process of loess slope under irrigation condition. Irrigation rig used for slope surface and slope top irrigation was designed. In the meanwhile, two groups of indoor physical model experiments respectively with slope of 45 degrees and slope of 60 degrees were conducted, and three kinds of sensors namely volume moisture sensors, matric suction sensors and pore water pressure sensors were buried inside the slopes to record the internal changes. Based on the analysis and the comparison of the experimental procedures and results of two groups, the deformation and failure law of shallow loess landslide under irrigation condition is disclosed, and the failure mode and the triggering mechanism of this kind of landslides are summarized. The experimental results show that, at the early stage of the experiments, with the continuous increases of volume moisture, the matric suction of the loess decreased gradually and maintained stable in the end while the strength reduced accordingly at the later stage, the upper loess of the slope reached the saturation stage, excess pore water pressure was generated by the slope deformation and poor drainage of the loess, which decreased the effective stress and the strength of the loess. As a result, the strength reached the minimum, which resulted in landslides. And meanwhile, the steeper a slope is, the greater probability of landslide occurrence is, and the smaller the depth of sliding surface and sliding distance are. |
| |
| Keywords: | Loess slope irrigation landslide physical model experiment pore water pressure |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质力学学报》浏览原始摘要信息 |
| 点击此处可从《地质力学学报》下载免费的PDF全文 |
|
