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文摘
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对三维简化的Janbu法进行了扩展,使得离散后在同一行上的各条块在水平横向的安全系数相等以及在同一列上的条块在水平纵向的安全系数相等,得到不同行(列)的安全系数,最后通过各条块底滑面的几何特性与受力分析给出其独立的安全系数以及各条块潜在的滑动方向.该方法拓展了传统极限平衡方法只给出坡体总体安全系数的思路,可对坡体局部稳定性和潜在滑动方向进行判定.该方法可适用于任意形状的滑面,还可分析包括考虑孔隙水压力、地质体分层、上覆载荷以及地震力等其他形式的外载. |
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其他语种文摘
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Two-dimensional Janbu's generalized procedure of slices is one of the rigorous methods for slope stability analysis. However, twice iterations must be carried out and the convergency problem may often be encountered in the computational process. Hence, a simplified Janbu's method is developed in which the interslice shear forces are assumed to be zero and only once iteration is needed. Generally, the result obtained by simplified Janbu's method is very close to that given by complete Janbu's method, therefore the former is adopted in a number of commercial programs. It is natural to extend the 2D method to conduct 3D slope stability analysis. Compared with two-dimensional slope stability analysis, it is more difficult to conduct three-dimensional analysis, for the geometric shape of the sliding body may be asymmetric and the slope may also possess complicated slip surface, irregular boundaries, and multiple geological layers. The method proposed in this paper extends the simplified Janbu's method for three-dimensional slope stability analysis. By setting the safety factors to be equal for discretized blocks on the same row/column and combining the geometric feature of the bottom slip surface, the local safety factor and potential sliding direction for each block can be obtained. This method extends traditional limit-equilibrium method in which only the total safety factor for a slope is given, thus it may be used to evaluate local stability and sliding direction for a slope. This proposed method may be applied to various types of potential slip surfaces, complicated geological boundaries and stratifications, water pressure, and earthquake loading. |
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来源
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岩石力学与工程学报
,2004,23(17):2876-2881 【核心库】
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关键词
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岩土力学
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三维边坡分析
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稳定性分析
;
极限平衡
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地址
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中国科学院力学研究所, 北京, 100080
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6915 |
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学科
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建筑科学 |
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基金
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国家自然科学基金
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国家973计划
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:1685072
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