›› 2016, Vol. 37 ›› Issue (S2): 25-34.doi: 10.16285/j.rsm.2016.S2.003

• 基础理论与实验研究 • 上一篇    下一篇

强降雨条件下具有张裂缝边坡临界滑动场

蒋泽锋1, 2,朱大勇1, 2   

  1. 1. 合肥工业大学 土木与水利工程学院,安徽 合肥 230009; 2. 合肥工业大学 安徽省土木工程与材料省级重点实验室,安徽 合肥 230009
  • 收稿日期:2016-03-17 出版日期:2016-11-11 发布日期:2018-06-09
  • 作者简介:蒋泽锋,男,1986年生,博士研究生,主要从事岩土力学与工程方面的研究工作。
  • 基金资助:
    教育部优先发展课题(No.2013JYYF0661);水利部公益项目(No.201401063);国家自然科学基金(No.51179043)。

Critical slip field of slope with tension crack under intensive rainfall

JIANG Ze-feng1, 2, ZHU Da-yong1, 2   

  1. 1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Anhui, Hefei 230009 China; 2. Anhui Key Laboratory of Civil Engineering and Materials, Hefei University of Technology, Anhui, Hefei 230009, China
  • Received:2016-03-17 Online:2016-11-11 Published:2018-06-09
  • Supported by:
    This work was supported by priority development project of Ministry of Education(2013JYYF0661), Ministry of Water Resources Public Welfare Profession Special Scientific Research Foundation of China(201401063), and the National Natural Science Foundation of China(51179043).

摘要: 降雨持时较长且雨强较大时,雨水的入渗不仅会增大孔隙水压力,且易使张裂缝充水形成静水压力,对边坡稳定不利。结合降雨条件下饱和-非饱和渗流分析,考虑降雨过程中的瞬态孔隙水压力场与瞬态强度场,并同时考虑张裂缝充水时的静水压力,对边坡临界滑动场法进行改进,提出降雨条件下具有张裂缝边坡临界滑动场数值模拟方法,且对其进行了验证。将该方法用于一个典型均质黏土边坡算例,结果表明,(1)文中方法可考虑张裂缝具体位置、深度及其充水状态下对边坡稳定性的影响,并能搜索出任意形状危险滑面,计算结果合理可靠;(2)降雨条件下张裂缝中静水压力对边坡稳定性及滑面形状有较大影响;(3)降雨条件下张裂缝位置对边坡稳定有较大影响,距坡肩越近,张裂缝对边坡稳定性影响越大;(4)张裂缝处在最不利位置且充水时存在一个最不利深度。

关键词: 边坡临界滑动场, 边坡稳定性, 张裂缝, 强降雨, 非饱和渗流分析

Abstract: Pore water pressure and water table in the tension crack will increase gradually under the long duration rainfall with high intensity and it will be adverse to the slope stability. In combination with transient unsaturated seepage calculation, an improved numerical procedure for critical slip field of slope with tension crack under intensive rainfall is proposed. In this procedure, transient pore water pressure field, the location of crack and hydrostatic pressure in crack can be taken into account, put forward under the condition of rainfall has a crack slope critical sliding field numerical simulation method, and its are verified. This procedure has been applied to the stability analysis of a typical clay slope. The results show that: (1) The method can search for any shape of the dangerous slip surfaces under the condition of considering the location of tension crack and hydrostatic pressure in crack; and the safety factor is reliable. (2) Hydrostatic pressure in crack has great influence on slope stability and searching for the sliding surface. (3) Crack location has great influence on slope stability under rainfall; and the closer to the slope shoulder the location of tension crack is, the more unstable the slope is. (4) There is a most disadvantageous depth of tension crack when tension crack is located at the most disadvantageous position.

Key words: critical slip field, slope stability, tension crack, intensive rainfall, unsaturated seepage analysis

中图分类号: 

  • TU 473
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