| 重庆市洪崖洞危岩发育机理 |
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| 引用本文： | 李明,陈洪凯,叶四桥.重庆市洪崖洞危岩发育机理[J].中国地质灾害与防治学报,2008,19(2):1-6. |
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| 作者姓名： | 李明 陈洪凯 叶四桥 |
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| 作者单位： | 1. 重庆交通大学,岩土工程研究所,重庆,400074;西南交通大学,土木工程学院,四川,成都,610031
2. 重庆交通大学,岩土工程研究所,重庆,400074 |
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| 基金项目： | 国家自然科学基金，重庆市自然科学基金，西部交通建设科技项目 |
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| 摘 要： | 危岩是山丘地区常见的地质灾害，严重威胁着人民的生命及财产安全。但是，其在发育过程中具有明显的链式规律，包括宏观链及微观链。根据这一原理，以重庆市整治、开发的重点工程——洪崖洞危岩为例，对危岩发育的链式机理进行了探讨，将危岩体划分为群体及单体两类，分析了影响危岩形成的主要因素与过程。运用材料力学和断裂力学方法，初步得到洪崖洞危岩体的天然稳定时间约为661年。基于平面应变假定，采用有限元数值模拟软件对洪崖洞危岩的发育过程进行计算。在链式发育过程中，危岩体的形成主要是由于岩腔形成过程中危岩体顶部受拉，形成卸荷带裂缝，进而促进了危岩体发生以受拉破坏为主的崩塌，实际与理论计算的结果基本吻合，为危岩治理提供了可靠的理论依据。
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| 关 键 词： | 洪崖洞危岩 链式机理 发育机理 数值模拟 重庆市 |
Failure mechanism of Hongyadong dangerous rockmess,Chongqing City |
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| LI Ming,CHEN Hong-kai,YE Si-qiao.Failure mechanism of Hongyadong dangerous rockmess,Chongqing City[J].The Chinese Journal of Geological Hazard and Control,2008,19(2):1-6. |
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| Authors: | LI Ming CHEN Hong-kai YE Si-qiao |
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| Institution: | LIMing , CHEN Hong-kai , YE Si-qiao ( Instisute of Geotechnical Engineer, Chongqing Jiaotong University, Chongqing 400074, China ; School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China) |
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| Abstract: | Dangerous rockmass is common geological disasters, and a serious threat to people＇s life and property safety,＂ it has obvious chain laws, including macro and micro chain levels. According to this principle, the key projects- Hongyadong dangerous rockmass in Chongqing is exampled to discuss the development of dangerous rockmass chain mechanism. The paper divides dangerous rockmass into groups mid monomer, analyses the impact of dangerous rockmass formation of the main factors and processes, concludes that the natural stability of the dangerous rockmass is about 661 years through material mechanics and fracture mechanics method. Based on the assumption of plane strain, using the finite element numerical simulation software, it simulates tie Hongyadong＇s developing procession. In the chain developing process, the reason of dangerous rockmass in the formation is mainly the tension in the top of cavity formation of dangerous rockmass, which induces unloading cracks zone, thereby promotes a tension damage collapse in dangerous rockmass. The result which is consistent with the practical and theoretical calculations, provides a reliable theoretical basis for the treatment of dangerous rockmass. |
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| Keywords: | Hongyadong dangerous rockmass chain mechanics developing mechanics numerical simulation ChongqingCity |
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