| 某地下洞室全长粘结式锚杆受力特性分析 |
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| 引用本文： | 谢冰冰,肖明,邓建.某地下洞室全长粘结式锚杆受力特性分析[J].水电能源科学,2015,33(6):126-130. |
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| 作者姓名： | 谢冰冰 肖明 邓建 |
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| 作者单位： | 武汉大学 a. 水资源与水电工程科学国家重点实验室; b. 水工岩石力学教育部重点实验室， 湖北 武汉 430072 |
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| 基金项目： | 国家自然科学基金项目（51279136，91215301)；教育部博士点基金项目(20130141110015)；国家自然科学青年基金项目（51209164） |
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| 摘 要： | 为研究全长粘结锚杆锚固界面应力传递机理,建立了锚固界面应力计算模型,基于锚固界面弹性状态下锚固体与围岩协调变形假定,构建了锚杆内力与围岩位移之间的数学模型,利用有限元弹塑性数值模拟推导了沿杆长方向锚杆轴力与剪力的分布函数,并考虑接触面的损伤劣化,引入损伤变量,建立了损伤状态下锚杆应力修正与锚固支护效应力学模型。对某水电站地下厂房开挖过程中吊车梁锚杆受力特性的分析结果表明,本文方法合理、有效。
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| 关 键 词： | 地下洞室 全长粘结式锚杆 锚固界面 传力机理 受力特性 |
Stress Characteristics Analysis of Fully Grouted Rock Bolt of Underground Caverns |
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| Abstract: | A stress calculation model is established based on stress transfer mechanism of the anchoring interface between rock bolt and surrounding rock. According to hypothesis that the deformation of rock bolt is compatible with that of surrounding rock whereas the interface is elastic, a mathematical model is set up to describe the relationship between the stress of rock bolt and the deformation of surrounding rock. Based on elastic plastic finite element simulation, the distribution functions of rock bolt shear stress and axial stress are obtained. Taking deterioration of interface into account, a damage variable is put forward to revise the stress of rock bolt and to build a model of anchoring effects. On the basis of excavation of underground caverns, the stress characteristics of the rock bolt at the crane beam is analyzed and the rationality of computational method is appropriately proved. |
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| Keywords: | underground caverns fully grouted rock blot anchoring interface stress transfer mechanism stress characteristics |
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