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中南大学学报(自然科学版)

Journal of Central South University

第40卷    第2期    总第186期    2009年4月

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文章编号:1672−7207(2009)02−0498−06
考虑坡顶超载情况下的边坡剪胀效应分析
蒋青青1,陈占锋1,赖伟明2,林  杭1

(1. 中南大学 资源与安全工程学院,湖南 长沙,410083;
2. 中南大学 土木建筑学院,湖南 长沙,410075
)

摘 要: 为了研究剪胀角ψ对边坡稳定性的影响,利用FLAC3D软件建立均质边坡模型,分析不同工况下ψ与安全系数F和滑动面之间的关系。研究结果表明:无坡顶超载p时,随着ψ的增大,F表现出先增大后减小的二次抛物线样式,滑动面上缘与坡顶的距离越来越小;随着内摩擦角 的增大,由关联与非关联流动法则得到的安全系数的差值 同样符合二次抛物线规律;有坡顶超载p时,随着p的增大,由非关联流动法则得到的F逐渐减小;内摩擦角 增大引起ψF的影响不断滞后;p越大,滑动面越陡,上缘越靠近坡顶。

 

关键字: 边坡;超载;强度折减;剪胀角;稳定性

Dilation effect of slope under over-loading on top of its surface
Jiang Qing-qing1, CHEN Zhan-feng1, LAI Wei-ming2, LIN Hang1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. School of Civil and Architectural Engineering, Central South University, Changsha 410075, China

Abstract: In order to study the effect of dilation angle ψ to the stability of slope, a numerical model was founded in plane strain mode by FLAC3D software for homogeneous soil slope. The safety factor and slip plane were obtained for different dilation angles, and the relationships among dilation angle, safety factor and slip plane were analyzed in different situations. The results show that in the situation with over-load p on the upper surface of slope, with the increase of dilation angle, relationship between safety factor and dilation angle presents the discipline like parabola curve, first increases and then decreases, and the distance between upper vertex and top of slope becomes smaller; difference  between the safety factor of associated flow and non-associated flow presents the discipline like parabola curve with the increase of friction angle. In the situation with over-load p on the upper surface of slope, with the increase of p, F from non-associated flow reduces gradually, and the effect of dilation angle on the safety factor is lagged with the increase of friction angle . Slip plane becomes steeper with the upper vertex coming closer to the top of slope.

 

Key words: slope; over-loading; strength reduction; dilation angle; stability

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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