应用数学和力学2024，Vol.45Issue(3)：273-286,14.DOI:10.21656/1000-0887.440146
考虑不同破坏形式下隧道锚承载力及破坏阶段研究
Study on Bearing Capacities and Failure Stages of Tunnel-Type Anchorage Considering Different Failure Modes
摘要
Abstract
The existing studies mostly take the occurrence of plastic zones or stress peak point transfer on the contact surface of anchor rock as the criterion for the limit state.However,due to different engineering geolog-ical conditions,there are significant differences in the fracture surface alignments of tunnel anchors,and the ul-timate bearing capacity of the tunnel-type anchorage(TTA)cannot be accurately derived.To further explore the working process of the TTA under pull-out loading,the power exponential form was used to characterize the shape of the inverse cone damage rupture surface,based on Mindlin's stress solution and the peak shear stress control theory.The interface failure stress distribution was obtained,the equations for the bearing capac-ities under 2 damage forms were given.Five domestic TTA suspension bridges were taken for example and veri-fication in both damage forms,and the effects of different parameters on the TTA load-bearing capacity were analyzed.The results show that,the main source for the bearing capacity is the cohesive force on the fracture surface,which is more than 50%of the total.The bearing capacity increases linearly with the length and the co-hesion force,and grows with the inclination angle at a slowing rate.The bearing capacity would first increase and then decrease with the inclination angle under the interface failure form.These derived results are basically in agreement with those previous experimental and numerical results.The analysis of the proposed analytical displacement curves indicates that,the working process of the TTA has 3 visible stages,and the final failure mode is a combination of the interfacial failure and the inverse cone failure.关键词
桥梁工程/隧道式锚碇/极限承载能力/Mindlin应力解/解析法Key words
bridge engineering/tunnel-type anchorage/ultimate bearing capacity/Mindlin's stress solution/analytical method分类
交通运输引用本文复制引用
杨国俊,吕明航,唐光武,田骐玮,杜永峰..考虑不同破坏形式下隧道锚承载力及破坏阶段研究[J].应用数学和力学,2024,45(3):273-286,14.基金项目
国家自然科学基金(51808274 （）
52168042) （）
甘肃省科技计划(22JR5RA250) （22JR5RA250）
中国博士后科学基金(2019M653897XB) （2019M653897XB）
