强降雨条件下基岩型层状边坡入渗模型及稳定性研究

doi:10.16285/j.rsm.2016.11.015

›› 2016, Vol. 37 ›› Issue (11): 3156-3164.doi: 10.16285/j.rsm.2016.11.015

强降雨条件下基岩型层状边坡入渗模型及稳定性研究

覃小华^{1, 2}，刘东升³，宋强辉^{1, 2}，王旭^{1, 2}，吴润泽^{1, 2}，辛建平^{1, 2}

1.后勤工程学院军事土木工程系，重庆 401311；2.后勤工程学院岩土力学与地质环境保护重庆市重点实验室，重庆 401311； 3.重庆市地质矿产勘查开发局，重庆 400071

收稿日期:2016-04-19 出版日期:2016-11-11 发布日期:2018-06-09
通讯作者: 刘东升，男，1962年生，博士，博导，总工程师，主要从事边坡工程可靠度分析和地质环境风险评估研究。E-mail：dshliu@vip.sina.com E-mail:673124692@qq.com
作者简介:覃小华，男，1988年生，博士研究生，主要从事非饱和土及边坡工程分析方面的研究工作。
基金资助:
国家自然科学基金资助项目（No. 51408603）；重庆市基础与前沿研究一般项目（No. cstc2013jcyjA00010, No. cstc2014jcyjA30014）

Infiltration model of bedrock laminar slope under heavy rainfall and its stability analysis

QIN Xiao-hua^{1, 2}, LIU Dong-sheng³, SONG Qiang-hui^{1, 2}, WANG Xu^{1, 2}, WU Run-ze^{1, 2}, XIN Jian-ping^{1, 2}

1. Department of Civil Engineering, Logistical Engineering University, Chongqing 401311, China; 2. Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Logistical Engineering University, Chongqing 401311, China; 3. Chongqing Bureau of Geology and Minerals Exploration, Chongqing 400071, China

Received:2016-04-19 Online:2016-11-11 Published:2018-06-09
Supported by:
This work was supported by the National Natural Science Foundation of China (51408603) and Chongqing Research Program of Basic Research and Frontier Technology(cstc2013jcyjA00010 and cstc2014jcyjA30014).

摘要/Abstract

摘要： 强降雨作用下基岩型层状边坡易发生失稳破坏，给人们生命财产造成重大损失。为探索基岩型层状边坡的降雨入渗过程，以Green-Ampt入渗模型为基础，考虑了边坡几何特征及饱和带渗流作用，得到了边坡不同入渗阶段入渗率和湿润峰深度的计算式，建立了适用于基岩型层状边坡的降雨入渗计算模型；在分析基岩型层状边坡稳定性时，考虑了饱和带的渗流作用，联合降雨入渗模型与极限平衡法，分析了基岩面与湿润峰面稳定性的变化规律，得到了计算基岩型层状边坡安全系数的解析表达式；结果表明，该模型的计算与试验结果具有一致性。利用该计算模型与传统计算方法对张家湾滑坡进行了强度为30 mm/h的降雨入渗与稳定性分析，得到了不同计算方法下张家湾滑坡湿润峰深度及安全系数随降雨历时增加而发生的变化规律，结果表明该计算模型在分析基岩型层状边坡稳定性时优于传统分析方法。

关键词: 强降雨, 层状边坡, 降雨入渗, 湿润峰, 稳定性, 安全系数

Abstract: The failure of bedrock laminar slope mostly happens due to heavy rainfall; and it causes huge losses to people’s lives and property. To explore the process of rainfall infiltration into bedrock laminar slope under heavy rainfall, a new rainfall infiltration model for this slope is built and then a formula of calculating infiltration rate and wetting front depth about slope is obtained for different stages based on Green-Ampt infiltration model. The geometric characteristics of slope and the seepage of saturation zone are considered in this new model. Based on the rainfall infiltration model and limit equilibrium method, an analytical expression of safety factor is developed for bedrock laminar slope under different rainfall durations by considering the seepage of saturation zone. The expression is used to analyze the variation of the surface of bedrock and the surface of wetting front. It is shown that the calculated results have a high consistency with that of slope model test. Moreover, the proposed procedure and the traditional method are employed to analyze the process of rainfall infiltration and the regularity of stability of Zhangjiawan landslide under the rainfall intensity of 30 mm/h. The variations of wetting front depth and safety factors with the increase of rainfall duration are obtained. The results show that, the proposed procedure is superior to traditional method in analyzing the stability of bedrock laminar slope.

Key words: heavy rainfall, laminar slope, rainfall infiltration, wetting front, stability, safety factor

中图分类号:

TU 411

覃小华，刘东升，宋强辉，王旭，吴润泽，辛建平, . 强降雨条件下基岩型层状边坡入渗模型及稳定性研究[J]. , 2016, 37(11): 3156-3164.

QIN Xiao-hua, LIU Dong-sheng, SONG Qiang-hui, WANG Xu, , . Infiltration model of bedrock laminar slope under heavy rainfall and its stability analysis[J]. , 2016, 37(11): 3156-3164.

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强降雨条件下基岩型层状边坡入渗模型及稳定性研究

Infiltration model of bedrock laminar slope under heavy rainfall and its stability analysis

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