华中科技大学学报（自然科学版）2017，Vol.45Issue(6)：113-119,7.DOI:10.13245/j.hust.170622
地下洞室全长粘结式锚杆受力分析方法
Stress analysis method of fully grouted rock bolt in underground caverns
摘要
Abstract
Taking fully grouted rock bolt of underground caverns as research object, the load transfer mechanism of the bolt and surrounding rock was analyzed, and the basic differential equation of load transfer was deduced.The finite difference method was used to solve the equation combined with free deformation of the rock.Then the distributions for axial force and interfacial shear stress of anchorage body along the bolt length were obtained.The interfacial mechanical property of anchorage body was described by the two-line shear slip model.The stress of anchorage body was modified by constantly updating the displacement of the rock, considering transforming the excess interfacial shear stress into nodal load of the model after anchorage body slips.The pull-out test was simulated based on the bolt algorithm.The results show that the algorithm is reasonable and feasible.By analyzing the force of a characteristic bolt in a diversion tunnel, the influences of elastic modulus of the rock, interfacial shear stiffness, thickness of mortar, diameter and length of the bolt on the force of anchorage body were calculated.The results can provide theoretical basis for optimizing the layout of the bolts in underground caverns.关键词
地下洞室/全长粘结式锚杆/剪切滑移/应力分布/影响分析/锚固效果Key words
underground caverns/fully grouted rock bolt/shear slip/stress distribution/impact analysis/anchoring effect分类
建筑与水利引用本文复制引用
刘国庆,肖明,陈俊涛,周浩..地下洞室全长粘结式锚杆受力分析方法[J].华中科技大学学报（自然科学版）,2017,45(6):113-119,7.基金项目
国家重点基础研究发展计划资助项目 (2015CB057904) （2015CB057904）
国家自然科学基金资助项目 (51579191,51279136). （51579191,51279136）
