土工基础 ›› 2020, Vol. 34 ›› Issue (4): 418-422.

• 工程实录 • 上一篇    下一篇

降雨对南京方山边坡稳定性的影响分析

刘海波,许宝田,王 波   

  1. (南京大学地球科学与工程学院,南京 210023)
  • 收稿日期:2019-10-12 修回日期:2019-10-17 出版日期:2020-08-20 发布日期:2020-08-15
  • 作者简介:刘海波(1990-),男,硕士研究生,研究方向为城市环境岩土工程。
  • 基金资助:
    江苏省地质矿产局科技项目(2017-KY-01)资助项目

Analysis of the Influence of Precipitation on the Stability of Fangshan Slope in Nanjing

LIU Haibo, XU Baotian, WANG Bo   

  1. (School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023)
  • Received:2019-10-12 Revised:2019-10-17 Online:2020-08-20 Published:2020-08-15

摘要: 以方山彩蝶谷滑坡为例,研究降雨对南京方山边坡稳定性的影响。基于滑坡体的工程地质特征,确定彩蝶谷滑坡是典型的降雨型滑坡。结合南京地区实际降雨情况,选取历史降雨数据,运用二维有限元(slide)软件分析不同降雨条件对边坡稳定性的影响。彩蝶谷边坡稳定性与降雨密切相关,降雨是诱发其滑动的主要因素,降雨入渗致使坡体含水量逐渐增加,使非饱和带产生暂态饱和,暂态饱和区逐渐向下延伸,孔隙水压力不断增大,导致有效应力降低,坡体抗剪强度下降;边坡稳定性对降雨强度十分敏感,降雨强度越大,稳定性下降越快。该研究可为类似边坡工程的治理和监测预警提供参考。

关键词: 方山滑坡, 降雨, Slide, 边坡稳定性

Abstract: This paper presents a case history examining the effect of precipitation on the stability of slopes in Nanjing at Fangshan Caidiegu Landslide. By analyzing the engineering and geological characteristics of the landslide, it is concluded that this landslide is a typical rainfall-induced landslide. Based on the actual precipitation conditions in Nanjing, the influence of the different precipitation conditions on the slope stability is analyzed by using a twodimensional finite element software based on the historical precipitation data. The results show that the stability of the Caidiegu slope is closely related to the precipitation which is the main factor inducing sliding. The infiltration of the rainwater results in a gradual increase of the moisture content in the slope. Then, the previously unsaturated zone becomes transiently saturated, and progressively extends downward from the surface. Therefore, the pore water pressure is continuously increased, resulting in a decrease in effective stress and the shear strength of the soils; the slope stability is very sensitive to the rainfall intensity, and the greater the rainfall intensity, the faster the stability declines.

Key words: Fangshan Landslide, Precipitation, Slide, Slope Stability

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