巴东组红层软岩缓倾顺层边坡破坏机制分析

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摘要在对边坡岩体进行一系列工程地质特性试验研究的基础上，以该类边坡最常见的平面滑动模式建立潜在滑动面上不同位置的稳定性系数表达式，结合实例计算分析边坡开挖对其稳定性的影响，并对潜在滑动面软弱夹层的剪切流变过程进行分析。分析结果表明，巴东组红层软岩缓倾顺层边坡的破坏是从坡脚开挖开始到潜在滑动面，由等速蠕变到加速滑动的渐进过程，期间伴随着坡脚岩体的崩解、节理裂隙的扩展延伸和地表水沿裂隙下渗软化潜在滑动面等因素的共同促进作用。在掌握该类边坡破坏机制的基础上，对其加固方式和施工组织提出相关建议，研究成果对同类型边坡的设计和施工具有重要的参考意义。

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关键词 ：边坡工程, 红层软岩, 缓倾顺层边坡, 渐进破坏, 软弱夹层

Abstract：Based on series of experiment researches on the engineering geological properties of Badong red beds，the formulae of stability coefficient on different positions of potential sliding surface are established by the mode of plane sliding which is most commonly used for this kind of slope. Combining with the calculation of the examples，the analysis of influence of excavation on slope stability is conducted and the shear rheological process of weak intercalation on the potential sliding surface is analyzed. The research results show that the failure of Badong red bed soft rock gently inclined bedding slope begins at the excavation of slope foot，and intends to potential sliding surface. The process starts from constant rate creep，gradually to accelerated sliding，which comes with the interaction of many factors，such as disintegration of rock mass，crack growth and water infiltration softening the potential sliding surface. On the basis of grasping the failure mechanism of this kind of slope，the related recommendations on the reinforcement means and construction managements are proposed and the research results have significant referenced values for the similar slope.

Key words： slope engineering red bed soft rock gently inclined bedding slope progressive failure weak intercalation

收稿日期: 2009-06-01

引用本文:

卢海峰，陈从新，袁从华，于洪丹，沈强. 巴东组红层软岩缓倾顺层边坡破坏机制分析[J]. 岩石力学与工程学报, 2010, 29(S2): 3569-3577.
LU Haifeng，CHEN Congxin，YUAN Conghua，YU Hongdan，SHEN Qiang. ANALYSIS OF FAILURE MECHANISM OF BADONG RED BED SOFT ROCK GENTLY INCLINED BEDDING SLOPE. , 2010, 29(S2): 3569-3577.

链接本文:

http://www.rockmech.org/CN/Y2010/V29/IS2/3569

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