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。
A stress calculation model is established based on stress transfer mechanism of the anchoring interface be- tween 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 dis- tribution 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 bo｜t at the crane beam is analyzed and the ration- ality of computational method is appropriately proved.
出处
《水电能源科学》
北大核心
2015年第6期126-130,共5页
Water Resources and Power
基金
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)
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
underground caverns
fully grouted rock blot
anchoring interface
stress transfer mechanism
stress characteristics
