降雨条件下折线型滑面的大型滑坡稳定性离心模型试验

潘皇宋; 李天斌; 仵拨云; 任 洋; 宋 涛

doi:10.11779/CJGE201604014

降雨条件下折线型滑面的大型滑坡稳定性离心模型试验 English Version

1.成都理工大学地质灾害防治与地质坏境保护国家重点实验室,四川成都610059;
2.陕西省地质环境监测总站,陕西西安710064

基金项目: 地质灾害防治与地质环境保护国家重点实验室团队重点课

详细信息

作者简介:
潘皇宋(1988- ),男,贵州黔东南人,硕士研究生,从事地质灾害与岩体工程研究。E-mail: gz_phs@163.com。

中图分类号: TU41
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出版历程
- 修回日期: 2015-03-12
- 发布日期: 2016-04-24

Centrifugal model tests on large-scale landslide with broken-line slip surface under rainfall

1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;
2. The Geological Environmental Monitoring Station of Shaanxi Province, Xi'an 710064, China

摘要

摘要: 以大型土工离心机为技术依托,采用离心模型试验,研究开挖和降雨对滑面为折线型的大型滑坡变形破坏和稳定性的影响。试验中采用变形标志点、颗粒图像测速技术（PIV）和可承受高离心力的传感器,在获取坡体土压力、孔隙水压力和位移矢量场的基础上,综合分析开挖和降雨诱发大型滑坡变形破坏的特征及失稳模式。试验结果表明,在滑面形态变化大的部位开挖卸荷容易引起折线型滑面大型滑坡的局部复活; 受开挖卸荷和降雨影响,滑坡后缘的开挖斜坡位移最大且最先失稳; 受降雨的影响,滑坡前部位移较大,坡体表面变形破坏严重,开挖斜坡下部发育一条次级滑裂面,滑坡后缘和开挖平台前沿滑面坡度突变处各形成一条潜在主滑裂面。离心模型试验显示折线型滑面的滑坡受开挖和降雨的影响可表现出分级分块滑动的变形破坏特征。稳定性分析表明,降雨使折线型滑面的大型滑坡不同滑段稳定性系数不同程度降低,滑坡后缘、开挖斜坡和滑坡前缘处于不稳定状态。
- 大型滑坡 /
- 稳定性 /
- 降雨 /
- 离心试验 /
- 颗粒图像测速技术
Abstract: Based on the technical support of the large geotechnical centrifuge, centrifugal model tests are performed to study the effects of rainfall and excavation on the deformation and stability of large-scale landslide with broken-line slip surface. The marking points, the particle image velocimetry technology and the sensors which can withstand high centrifugal force are applied during the tests. The earth pressure, pore water pressure and displacement vector field are obtained to make a comprehensive analysis on the characteristics of deformation and failure and the instability modes of large-scale landslide induced by rainfall. The test results show: (1) The unloading by excavation in the slope with large change of slip shape is easy to cause the local landslide in large-scale landslide with broken-line slip; (2) Under the rainfall and excavation, failure in the excavation slope is the earliest, and it has the maximum displacement; (3) Affected by the rainfall, large displacement occurs at the toe of slope and serious failure occurs on surface. A secondary slip surface occurs under the excavation slope, and two main slip surfaces located on the head of the slope and the down edge of the excavation area with change of the angle of the slip surface. The centrifugal mode tests indicate that the characteristics of deformation and failures of large-scale landslide with broken-line slip surface exhibit slide in different grades and blocks under the influence of excavation and rainfall. The stability analysis shows that the rainfall reduces the factor of safety of large-scale landslide, and the head of slope, excavation slope and slope toe are instable.
- large-scale landslide /
- stability /
- rainfall /
- centrifuge test /
- particle image velocimetry

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参考文献(22)

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[22]	LING H I, WU M H, LESHCHINSKY D, et al. Centrifuge modeling of slope instability[J]. J Geotechnical Geoenvironmental Engineering, 2009, 135(6): 758-767. 《岩土工程学报》征订启事 23 《岩土工程学报》创办于1979年,是我国水利、土木、力学、建筑、水电、振动等六个全国性学会联合主办的学术性科技期刊。由南京水利科学研究院承办,国内外公开发行。主要刊登土力学、岩石力学领域中能代表当今先进理论和实践水平的科学研究和工程实践成果等。报道新理论、新技术、新仪器、新材料的研究和应用。欢迎国家自然科学基金项目及其他重要项目的研究成果向本刊投稿,倡导和鼓励有实践经验的作者撰稿,并优先刊用这些稿件。主要栏目有黄文熙讲座、综述、论文、短文、工程实录、焦点论坛、讨论和简讯等。 24 本刊被《中文核心期刊要目总览》连续多年确认为核心期刊,并在建筑类核心期刊中位于前列;本刊被科技部“中国科技论文统计源期刊”（中国科技核心期刊）及“中国科技论文与引文数据库”收录;本刊被中国科学院“中国科学引文数据库”收录;本刊被“中国知网”全文收录及“中国学术期刊综合评价数据库”收录;本刊被“工程索引Ei Compendex数据库”和“日本科学技术振兴机构数据库JST”等国际数据库收录。本刊网址（www.cgejournal.com）全文发布本刊所有刊载文章。 25 本刊读者对象为土木建筑、水利电力、交通运输、矿山冶金、工程地质等领域中从事岩土工程及相关专业的科研人员、设计人员、施工人员、监理人员和大专院校师生。 26 本刊为月刊,A4开,双栏排版,192页,每月中旬出版,每期定价25元,全年300元。 27 本刊国际标准刊号ISSN 1000-4548,国内统一刊号CN 32-1124/TU,国内发行代号28-62,国外发行代号MO 0520。 28 欢迎广大读者在全国各地邮局订购,也可在编辑部订购（不另收邮费）。编辑部订购地址：南京虎踞关34号《岩土工程学报》编辑部;邮编：210024;联系电话：025-85829534,85829543,85829553,85829556;传真：025-85829555;E-mail: ge@nhri.cn。 29 （本刊编辑部）

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