›› 2018, Vol. 39 ›› Issue (11): 4109-4116.doi: 10.16285/j.rsm.2017.0295

• 基础理论与实验研究 • 上一篇    下一篇

基于应变软化的多阶边坡稳定分析

邓 琴1,汤 华1,王东英1, 2,秦雨樵1, 2,吴振君1   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2.中国科学院大学,北京 100049
  • 收稿日期:2017-02-23 出版日期:2018-11-10 发布日期:2018-11-15
  • 作者简介:邓琴,女,1983年生,博士,助理研究员,主要从事工程岩体稳定性分析方面的研究工作
  • 基金资助:
    国家自然科学基金(No. 51608518, No. 41202226);云南省交通运输厅科技项目(云交科教[2016]163号一(三));陆地交通气象灾害防治技术国家工程实验室开放基金(No. NELBP201601)

Bench-shape slope stability analysis based on strain softening model

DENG Qin1, TANG Hua1, WANG Dong-ying1, 2, QIN Yu-qiao1, 2, WU Zhen-jun1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-02-23 Online:2018-11-10 Published:2018-11-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51608518), the Science and Technology Projects of the Transportation Department of Yunnan Province([2016]163 1(3)), and the Fund for National Engineering Laboratory for Surface Transportation Weather Impacts Prevention (NELBP201601).

摘要: 多阶边坡除了最危险滑面需要关注,每级台阶的潜在滑面及其他不满足规范要求的滑面亦需要得到重视。以双台阶边坡和复杂多台阶边坡为例,基于应变软化理论,利用FLAC3D软件分析边坡的剪应变发展规律,根据剪应变的集中带获取边坡的多个潜在滑面。分析滑面的剪入、剪出和滑面中部点的强度参数变化规律,并结合矢量和法分析滑面在应变软化过程中安全系数的演化规律。研究结果表明:采用该方法可获取边坡的最危险滑面及次级滑动面;随着软化的发展,滑面上点的强度参数从峰值强度逐渐降低至残余强度,然而演化的速度不同;随着应变软化过程的发展,所有滑面的安全系数均逐渐降低,最后趋于一个定值。

关键词: 多级边坡, 应变软化, 矢量和法

Abstract: In addition to the critical slip surface, the potential slip surface of each step and other slip surfaces which do not meet the specification requirements of bench-shape slope also need to be considered. Based on strain softening theory, the development of shear strain in bench-shape slope is simulated by FLAC3D, and the multi-slip surfaces have been obtained. Meanwhile, the strength parameters and evolution of safety factor of slip surface in strain softening process have been analyzed by using vector sum method. Examples of double-step slope and complex multi-step slope show that: the critical and secondary slip surfaces can be obtained; the strength parameters in the slip surfaces gradually change from peak strength to residual strength as the strain softening progresses. However, the speed is different. With the development of strain softening process, the safety factor of all slip surfaces reduces gradually, and finally tends to a constant value.

Key words: bench-shape slope, strain softening model, vector sum method

中图分类号: 

  • TU 457

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