土工基础

›› 2013, Vol. 27 ›› Issue (2): 118-121.

• 工程实录 • 上一篇    下一篇

降雨作用下碎石土滑坡变形演化过程及孕灾模式研究

 程江涛,蔡 清,陈星星   

  1. （中冶集团武汉勘察研究院有限公司,武汉 430080）
  • 收稿日期:2013-03-29 出版日期:2013-04-20 发布日期:2013-04-26
  • 作者简介:程江涛(1983-)，男，博士，工程师，研究方向为岩土体稳定性评价与利用及数值模拟技术。

Development of Gravelly Soil Landslides Induced by Rainfalls

CHENG Jiangtao, CAI Qing， Chen Xingxing
   

  1. (Wuhan Surveying Geotechnical Research Institute Co, Ltd., MCC, Wuhan 430080)
  • Received:2013-03-29 Online:2013-04-20 Published:2013-04-26

摘要： 在总结碎石土滑坡地质模型的基础上，采用有限元数值方法研究不同降雨强度下碎石土滑坡的变形演化过程，并对降雨过程中及降雨后期1～7 d的应力应变情况进行分析，得出典型碎石土滑坡的变形破坏过程及其孕灾模式。研究表明，降雨过程中，滑坡中前部以水平剪切变形为主，中后部以沉降拉剪变形为主；碎石土滑坡在降雨作用下的孕灾模式可划分为三个阶段：后缘拉裂孕灾阶段、中部破裂扩展孕灾阶段、滑面贯穿孕灾阶段。

关键词: 降雨作用, 滑坡, 变形, 孕灾模式

Abstract: This paper presents the analysis results of the Shihuixi landslide under the heavy rainfall in Tongren Prefecture. The rainfall intensity is assumed to be 50mm/day and the duration is one day. The deformations of this gravelly soil slope during the precipitation and one to seven days after the rain are simulated by software SIGMA/W. Based on the analysis and the field observations, the precipitation induced geohazard model of this Shihuixi Landslide in gravelly soils is established. The result indicates that the large longitudinal deformations are occurred at the middle of the sliding body and larger transitional displacements are observed at the rearmiddle portion of the sliding body. There are three stages in this rainfall induced landslide: Tension stage at the rear; progressive of the failure in the middle portion stage and the development of failure surface stage.

Key words: Precipitation； Landslides, Deformations； Geohazard Model