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| Fracture mechanical analysis of collapse down of columnar dangerous rock base in southwest mountainous area
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| ZHAO Zhinan1，2，3，LI Bin1，3，HE Kai3，YIN Yueping1，3，GAO Yang1，3 |
| (1. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China；2. School of Geological Engineering and Geomatics，Chang?an University，Xi?an，Shaanxi 710054，China；3. Key Laboratory of Active Tectonics and
Geological Safety，Ministry of Natural Resources，Beijing 100081，China) |
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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.
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2022, Vol. 41 
