| 基于局部强度折减法的边坡多滑面分析方法及应用研究 |
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| 引用本文： | 李小春,袁维,白冰,石露.基于局部强度折减法的边坡多滑面分析方法及应用研究[J].岩土力学,2014,35(3):847-854. |
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| 作者姓名： | 李小春 袁维 白冰 石露 |
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| 作者单位： | 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试验室，武汉 430071 |
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| 基金项目： | 国土资源部公益性项目(No.201211063)；中国科学院事业费专项重大重要方向性项目(No.KZCX2-YW-T12) |
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| 摘 要： | 边坡最危险滑动面的搜索方法一直是研究的热点,但边坡内部次级滑动面也可能不满足安全设计要求,因此,考虑边坡多条滑动面的分析方法亦应得到关注。在传统强度折减法中,对边坡整个区域的抗剪强度参数进行折减,此方法仅可得到一个临界滑动面和最小安全系数。提出了一种基于局部强度折减法的多滑面分析方法,即首先定义单元安全系数的概念,并且计算边坡每个单元的安全系数,然后自动搜索出单元安全系数处于不同范围内的单元集合,对各个单元集合的强度参数进行折减计算,即可得到不同安全系数对应的滑动面。通过单台阶和双台阶边坡算例验证了该方法的可行性,结果表明,随着安全系数的增大,潜在滑面的深度和潜在滑动区域亦增大。最后把该方法应用到某隧道进口仰坡的稳定性评价中,通过该方法得到的多级滑动面与现场监测数据吻合较好。
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| 关 键 词： | 多滑动面 强度折减法 边坡 稳定性分析 安全系数 |
| 收稿时间： | 2012-12-28 |
Analytic approach of slope multi-slip surfaces based on local strength reduction method and its application |
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| LI Xiao-chun,YUAN Wei,BAI Bing,SHI Lu.Analytic approach of slope multi-slip surfaces based on local strength reduction method and its application[J].Rock and Soil Mechanics,2014,35(3):847-854. |
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| Authors: | LI Xiao-chun YUAN Wei BAI Bing SHI Lu |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The approach of searching the most dangerous slip surface is always a hot area for research. However, the other secondary potential slip surfaces, which do not meet the requirement of safety, should also receive attentions. The shear strength parameters of the whole area are reduced in the conventional strength reduction method; but only the minimum safety factor and the most dangerous slip surface can be obtained through this approach. An analysis method of slope multi-slip surfaces, which is based on local strength reduction method, is proposed. Firstly, the safety factor of each element is defined and calculated; different element sets with the safety factors falling in various specific scopes are found out automatically. And then the shear strength parameters of those element sets are reduced respectively; the slip surfaces corresponding to different safety factors are located. The feasibility of this approach is verified through a slope with single step and a slope with double steps. The results show that the depth of the secondary slip surface and the slip area enlarge with the increase of the safety factor of the slope. At last, this method is applied to stability analysis of a slope located at the entrance of a tunnel; and the multi-slip surfaces acquired from the proposed method can agree well with the field data. |
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| Keywords: | multi-slip surfaces strength reduction method slope stability analysis factor of safety |
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