为了探究动态非等比例双强度折减法在边坡稳定性应用的可行性,基于ABAQUS软件,根据三维边坡渐进破坏的过程和强度参数在边坡中发挥作用程度的不同,通过动态非等比例的双强度折减法理论,将Mohr-Coulomb强度准则中的黏聚力c和内摩擦角φ转换为Drucker-Prager强度准则中的屈服强度σ与内摩擦角β;并利用最短路径理论确定边坡的综合稳定性系数,评价边坡的稳定性。结果表明:基于D-P强度准则的动态非等比例的双强度折减法能够更合理地反映三维边坡的渐进破坏过程及其强度参数的发挥程度;所得到的边坡稳定性系数与以M-C准则计算得到的结果非常接近,且得到的边坡稳定性系数、边坡的位移均小于传统强度折减法的模拟结果,具有更高的安全储备。该方法收敛快速,在三维边坡的稳定性计算中有一定的应用价值。
Abstract
The aim of this research is to investigate the feasibility of non-proportional dynamic double strength reduction method in slope stability analysis. According to the 3-D progressive failure process and strength parameters of slope in ABAQUS software, the cohesion c and internal friction angle φ in Mohr-Coulomb strength criterion are converted into yield strength σ and internal friction angle β in Drucker-Prager strength criterion, and then the comprehensive stability coefficient of slope is determined through the shortest path to evaluate the slope stability. Results suggest that the non-proportional dynamic double strength reduction method based on Drucker-Prager criterion could reflect the progressive failure process and the roles of strength parameters; the slope stability coefficient obtained by Drucker-Prager criterion is highly close to that calculated by the M-C strength criterion, and the slope stability coefficient and displacement are both smaller than those of traditional strength reduction results with higher safety reserve.
关键词
双强度折减 /
非等比例 /
D-P强度准则 /
ABAQUS /
稳定性分析
Key words
double strength reduction /
non-proportional /
D-P strength criterion /
ABAQUS /
stability analysis
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参考文献
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基金
国家自然科学基金面上项目(41172281);国家科技部973项目(2011CB710604)
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