含软弱夹层边坡破坏过程及其影响因素分析
Analysis of Failure Process and Its Influencing Factors of Slope with Soft Interlayer
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摘要: 为研究软弱夹层及边坡自身特征对边坡破坏过程的影响,基于拉张破坏原理,以内蒙古某露天煤矿南帮边坡为背景,建立拉张破坏有限元模型,研究了边坡在不同夹层埋深、夹层倾角、夹层厚度、边坡倾角4种工况下坡体内裂纹扩展过程和第一主应力演变过程。结果表明:随着夹层倾角、夹层厚度、边坡倾角增大,边坡内裂纹更容易与软弱夹层贯通;随着夹层埋深增大,边坡表土层虽更易发生破裂,但裂纹的扩展程度与夹层埋深呈现相反的规律。Abstract: In order to study the influence of weak intercalated layer and its own characteristics on the stability of slope, the process of crack growth and the first principal stress evolution of the slope in the south slope of an open pit coal mine in Inner Mongolia under 4 conditions of different interlayer buried depth, dip angle of interlayer, thickness of the interlayer and the dip angle of the slope is studied by using tensile failure finite element model based on the theory of tensile failure. The results show that the cracks in the slope are more likely to link with the weak interlayer with the increase of dip angle of interlayer, the thickness of interlayer and the slope angle. Although the slope surface layer is more likely to break with the increase of the depth of interlayer, but the crack growth degree and interlayer depth present opposite law.
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Keywords:
- weak intercalated layer /
- crackle /
- major principal stress /
- numerical simulation /
- slope failure
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