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反倾层状岩质边坡失稳的断裂力学分析
Instability mechanism of counter-tilt layered rock slope by fracture mechanics analysis
投稿时间:2018-11-21  修订日期:2019-02-20
DOI:
中文关键词:  反倾岩质边坡  断裂力学  应力强度因子  稳定性分析  悬臂梁
英文关键词:rock layered counter-tilt slopes  fracture mechanics  stress intensity factor  stability analysis  cantilever beam
基金项目:国家重点基础研究发展计划(973计划)
作者单位E-mail
王建明 中国矿业大学(北京) 939705309@qq.com 
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中文摘要:
      反倾层状岩质边坡的高危地质灾害承载体在自然界中普遍存在,为研究其失稳破坏机制,本文把反倾边坡岩层简化为一个带裂缝的悬臂梁,建立了由一组结构面控制边坡稳定性的断裂力学模型,推导了各岩层结构面等效应力强度因子和岩层及边坡稳定性判据。分析了岩层倾角、层厚、结构面长度、内摩擦角、粘聚力5个因素对边坡的稳定性影响。结果表明:①随着岩层倾角和结构面长度的增加,边坡不稳定区域在增加,坡脚处的抗滑稳定性在减小。②随着内摩擦角和粘聚力的增大,边坡不稳定区域在减小,坡脚处的抗滑稳定性在增大。③随着岩层厚度的增大,不稳定岩层的范围基本保持不变。但是岩层的抗滑稳定区域随着厚度增加逐渐向坡脚移动,厚度越大,坡脚处的抗滑稳定性越大。通过实例分析,验证了理论的合理与可行性,研究结论对工程实践具有一定指导意义。
英文摘要:
      The high risk geological hazard bearing body of 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 deduced. Secondly, the influence of 5 factors on slope stability is analyzed, including slope angle, thickness, length of structural plane, internal friction angle and cohesion. The results show that:①With 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 smaller.②With 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 greater.③With 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 be. 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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