CAJ | 학술논문

爆破、地震或列车振动等动荷载作用下,边坡锚固系统易产生锚筋松弛、夹具损伤、注浆体拉裂及界面粘结失效等情况,影响其预应力赋存状态、加固效果和耐久性.基于动荷栽作用类型和锚固系统动力响应特征分析,提出了动栽下不同地层内的锚固段合理结构设计方案和锚筋抗拉安全系数及锁定荷栽的建议.动载下自由段(外锚固段)宜设计为全粘结型或增设多级反锚装置,形成岩土自锁锚固,以控制预应力损失和防止锚头或自由段破断造成突发性灾害;在水泥基灌浆体中掺入铜纤维或树脂纤维,可改善锚固体抗裂性能,提高其抗疲劳和抗冲击能力;建议优先采用防腐性能卓越的填充型环氧涂层钢绞线,以提高锚固体在动栽破裂时的耐久性.
폭파、지진혹열차진동등동하재작용하,변파묘고계통역산생묘근송이、협구손상、주장체랍렬급계면점결실효등정황,영향기예응력부존상태、가고효과화내구성.기우동하재작용류형화묘고계통동력향응특정분석,제출료동재하불동지층내적묘고단합리결구설계방안화묘근항랍안전계수급쇄정하재적건의.동재하자유단(외묘고단)의설계위전점결형혹증설다급반묘장치,형성암토자쇄묘고,이공제예응력손실화방지묘두혹자유단파단조성돌발성재해;재수니기관장체중참입동섬유혹수지섬유,가개선묘고체항렬성능,제고기항피로화항충격능력;건의우선채용방부성능탁월적전충형배양도층강교선,이제고묘고체재동재파렬시적내구성.
Under dynamic loads(such as blast,earthquake and train vibration),some adverse effects are produced on the slope anchor system including anchor bar relaxations,fixture damage,grout ripping and interface debonding,which can influence the occurrence of prestress,the reinforced impact and the durability of slope anchor system.Therefore based on the dynamic loads types and analysis on characteristics of dynamic response,the reasonable structure design of inner-anchoring section within different stratum under dynamic loads is given.Safety factor of anchor bar and loads locking way are also presented in this paper.Under dynamic loads,the free section should be designed to be full grouted or added additional multistage reverse anchoring set,so that the auto-lock anchorage comes into being in order to control the prestressing loss and prevent the anchorage(or free section)from rupture or avoid unexpected calamities.By adding steel fibre(or resins fibre)into cement grouting material,the cracking,fatigue and punching resistance capability of bolt-grouting body can be improved.And it is suggested that the epoxy coating steel strand cables of filled type should be adopted preferentially because of their good anti-corrosion performance.It can improve the durability of bolt-grouting body under dynamic loads.