西南山区柱状危岩体基座压裂溃屈断裂力学解析

doi:10.13722/j.cnki.jrme.2021.0828

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摘要通过断裂力学解析，提出西南山区柱状危岩体压裂溃屈型破坏机制及稳定性分析方法。结合柱状危岩体的发育特征，合理概化出上部完整岩体与底部多裂纹结构体组合而成的地质力学模型。引入岩体断裂力学，分析底部多裂纹结构体的裂隙起裂及扩展特性，进而建立基座控制柱状危岩体稳定性的分析方法。研究表明，在自重荷载作用下，基座岩体的裂纹呈翼裂纹形式扩展，据此，可将多裂纹间的岩桥破坏分为平行裂纹间岩桥拉张破坏与共线裂纹间岩桥剪切破坏。分析得出，基座岩体裂隙是否起裂及裂纹扩展的程度，是评价柱状危岩体稳定性的主要依据。最后以重庆箭穿洞、甑子岩两处危岩体为例，对此类地质灾害的危险性做出合理的评价。

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	赵志男1
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	李滨1
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	贺凯3
	殷跃平1
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	高杨1
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关键词 ：岩石力学, 危岩体, 压裂溃屈, 岩体断裂, 岩桥贯通, 裂纹起裂, 翼裂纹扩展

Abstract：Based on the analysis of fracture mechanics，the fracturing collapse mechanism and stability analysis method of columnar dangerous rock mass(CDRM) in southwest mountainous area are proposed in this study. Combined with the development characteristics of columnar dangerous rock mass，we generalize the geomechanical model composed of the upper intact rock mass and the bottom multi-crack structure in reason. And we also introduce rock fracture mechanics to analyze the cracks initiation and propagation characteristics in multi-crack structure，and then establish an analysis method of base controlling the stability of CDRM. This study shows that：under the self weight load，the form of crack propagation in base is wing crack. Accordingly，we can divide the failure of rock bridge into tensile failure between parallel cracks and shear failure between collinear cracks. Through the analysis，the cracks initiation and propagation degree are the main basises for evaluating the stability of CDRM. Taking Jianchuandong and Zengziyan dangerous rock mass both in Chongqing as examples，this study reasonably evaluates the risk of such geological disasters.

Key words： rock mechanics dangerous rock mass fracturing collapse down rock mass fracture rock bridge connection crack initiation wing crack propagation

引用本文:

赵志男1，2，3，李滨1，3，贺凯3，殷跃平1，3，高杨1，3. 西南山区柱状危岩体基座压裂溃屈断裂力学解析[J]. 岩石力学与工程学报, 2022, 41(S2): 3132-3140.
ZHAO Zhinan1，2，3，LI Bin1，3，HE Kai3，YIN Yueping1，3，GAO Yang1，3. Fracture mechanical analysis of collapse down of columnar dangerous rock base in southwest mountainous area . , 2022, 41(S2): 3132-3140.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0828 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3132

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