基于滑体渗透性与库水变动的滑坡稳定性变化规律研究

›› 2011, Vol. 32 ›› Issue (9): 2798-2802.

基于滑体渗透性与库水变动的滑坡稳定性变化规律研究

宋琨¹，晏鄂川^{1, 2}，朱大鹏¹，赵庆远¹

1. 中国地质大学（武汉）工程学院，武汉 430074；2. 教育部长江三峡库区地质灾害研究中心，武汉 430074

收稿日期:2010-04-01 出版日期:2011-09-10 发布日期:2011-09-13
作者简介:宋琨，男，1983年生，博士研究生，主要研究方向为岩土体稳定性评价与防治
基金资助:
国家重点基础研究发展计划(973)项目(No. 2011CB710605)；三峡库区三期地质灾害防治监测预警工程项目(No. SXJC-3ZH1D1_合[2009]003)

Base on permeability of landslide and reservoir water change to research variational regularity of landslide stability

SONG Kun¹，YAN E-chuan^{1, 2}，ZHU Da-peng¹，ZHAO Qing-yuan¹

1. Faculty of Engineering，China University of Geosciences, Wuhan 430074, China; 2. Three Gorges Research Center for Geo-hazard, Ministry of Education, Wuhan 430074, China

Received:2010-04-01 Online:2011-09-10 Published:2011-09-13

摘要/Abstract

摘要： 在三峡工程试运行期间，库区滑坡因地质结构和渗透性的不同，其变形情况存在明显差异，因此，除研究滑坡地质结构外，还应加强不同渗透性滑坡在库水变动下的稳定性响应规律研究。以三峡水库库首区黄荆树滑坡实例为计算模型，分析库水位在175～145 m间以0.5～2.0 m/d变化时4种不同渗透性滑坡的渗流场特征；再以库水影响系数? 和稳定性变化率为评价指标，研究在滑体渗透性和库水变动条件下的滑坡稳定性变化规律。研究表明，当库水影响系数? 在-0.107～-0.322时，稳定性变化率? 最大，且随? 减小滑坡稳定性增加率? 减小；当? 在-0.644～-769.231时，随? 减小稳定性增加率? 变化不明显；当? 在576.923～769.231时，库水位上升时滑坡稳定性降低较少；当? 在0.107～384.615时，影响系数? 与稳定性变化率? 的相关性不明显。其结果对于库区滑坡的监测预警有较强的应用价值

关键词: 水位变化, 渗透性, 水库滑坡, 库水影响系数, 稳定性变化率

Abstract: During the trial operation of the Three Gorges Project, there are remarkable differences between the deformation of landslides due to different geological conditions and permeabilities. Therefore, besides the geological structure, more attention should be paid to study the regularity of stability variation of different permeability landslides under the condition of reservoir level change. Taking the Huangjingshu landslide at the head area of the Three Gorges as the computation model, the seepage field of 4 landslides with different permeabilities are studied as the water level changes at a steady speed from 0.5 m/d to 2.0 m/d. As the evaluation index, reservoir water influence coefficient, the ratio of water level change speed to permeability coefficient, and stability change ratio is proposed. And the regularity of stability variation is obtained under the condition of permeability and water level change. The results show that when the reservoir water influence coefficient ? changes from -0.107 to -0.322, the stability change ratio ? is the largest; and the ? decreases as ? reduces. When ? changes from-0.644 to -769.231, the ? almost unchanged as ? decreased. When ? changes from 576.923 to 769.231, the reservoir filling had less effect on the landslide stability. When α changes from 0.107 to 384.615, the correlation of ? and ? is not obvious. It has some values for the landslide monitoring and warning in the Three Gorges reservoir area

Key words: reservoir level change, permeability, reservoir landslide, reservoir water influence coefficient, rate of stability change

中图分类号:

P 642

宋琨，晏鄂川，朱大鹏，赵庆远. 基于滑体渗透性与库水变动的滑坡稳定性变化规律研究[J]. , 2011, 32(9): 2798-2802.

SONG Kun ，YAN E-chuan ，ZHU Da-peng ，ZHAO Qing-yuan. Base on permeability of landslide and reservoir water change to research variational regularity of landslide stability[J]. , 2011, 32(9): 2798-2802.

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