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| Instability mechanism of counter-tilt layered rock slope by fracture mechanics analysis |
| Received:November 21, 2018 Revised:February 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20181121003 |
| KeyWord:rock layered counter-tilt slopes fracture mechanics stress intensity factor stability analysis cantilever beam |
| Author | Institution |
| 王建明 |
中国矿业大学北京力学与建筑工程学院, 北京 |
| 陈忠辉 |
中国矿业大学北京力学与建筑工程学院, 北京 |
| 张凌凡 |
中国矿业大学北京力学与建筑工程学院, 北京 |
| 周子涵 |
中国矿业大学北京力学与建筑工程学院, 北京 |
| 秦凡 |
中国矿业大学北京力学与建筑工程学院, 北京 |
| 陈红杰 |
中国矿业大学北京力学与建筑工程学院, 北京 |
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| Abstract: |
| The high risk geological hazard bearing body of an anti-dip layered rock slope exists universally in nature,in order to study the mechanism of instability and failure,in this paper,the anti-dip slope rock is simplified to a cantilever beam with cracks,a fracture mechanics model of slope stability controlled by a set of structural planes is established.A method of the equivalent stress intensity factors for rock blocks and the relevant stability criteria are derived.Secondly,the influences of 5 factors on slope stability are analyzed,which are slope angle,thickness,length of structural plane,internal friction angle and cohesion.The results show that:① With the increase of the dip angle and the length of the structural plane,the unstable area of the slope increases,and the stability of the slope at the foot is lower.② With the increase of internal friction angle and cohesion,the unstable area of the slope decreases,and the stability of the slope at the foot is higher.③ With the increase of rock thickness,the scope of unstable rock strata is basically unchanged.However,as the thickness of the rock increases,the anti-sliding stability of the strata will gradually move to the slope toe.The greater the thickness of the rock layer is,the greater the stability of the slope will have.Finally,the rationality and feasibility of the theory are verified through case studies.The research results have certain guiding significance for engineering practice. |
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