CAJ | 학술논문

都(江堰)-汶(川)公路是进出5?12汶川地震极重灾区的生命通道，横跨岷江两岸的彻底关大桥桥墩在5?12汶川地震中被左岸崩落的滚石击中而倒塌，经过恢复重建，新建彻底关大桥于2009年5月12日建成通车。2009年7月25日凌晨4：40左右，岷江右岸高位危岩发生大面积崩塌，巨石再次将彻底关大桥砸毁。经调查，岷江两岸山体存在多处危岩，极有可能再次发生滚石砸毁大桥的灾难性事件。为此，研发一种新型桥墩抗滚石冲击垫层结构，采用非线性有限元对桥墩受滚石撞击过程进行数值模拟研究，考虑滚石撞击过程中材料非线性、几何非线性和接触非线性以及桥墩中的横向箍筋和纵向钢筋的影响，结果表明所采用的垫层防护装置能够有效地缓冲滚石的冲击，大幅度提高桥墩抗滚石冲击的能力，按此思路设计的桥墩防护结构已经竣工3 a，运行效果良好。
도(강언)-문(천)공로시진출5?12문천지진겁중재구적생명통도，횡과민강량안적철저관대교교돈재5?12문천지진중피좌안붕락적곤석격중이도탑，경과회복중건，신건철저관대교우2009년5월12일건성통차。2009년7월25일릉신4：40좌우，민강우안고위위암발생대면적붕탑，거석재차장철저관대교잡훼。경조사，민강량안산체존재다처위암，겁유가능재차발생곤석잡훼대교적재난성사건。위차，연발일충신형교돈항곤석충격점층결구，채용비선성유한원대교돈수곤석당격과정진행수치모의연구，고필곤석당격과정중재료비선성、궤하비선성화접촉비선성이급교돈중적횡향고근화종향강근적영향，결과표명소채용적점층방호장치능구유효지완충곤석적충격，대폭도제고교돈항곤석충격적능력，안차사로설계적교돈방호결구이경준공3 a，운행효과량호。
Dujiangyan-Whenchuan road is the life line engineering of disaster areas hit by the 5?12 Whenchuan earthquake. Chediguan bridge on the road which stretches across the both sides of Mingjiang River collapsed due to rockfalls during the earthquake. After reconstruction,the new Chediguan bridge was open to traffic on May 12, 2009. July 25,2009,at 4:40 or so,a large area collapse on the Mingjiang River bank high unstable rock occurred, rockfalls smashed the Chediguan bridge again. After investigation, there are many rocks existing in the mountains of both sides of Minjiang River,which will likely trigger the catastrophic events of rockfalls smashed the bridge. On this basis,the development of a new cushion structure of rockfalls impact piers is executed,using nonlinear finite elemnet method,considering the effects of nonlinear material properties,nonlinear geometry,nonlinear contacts and rebars during the processes. The results show that,the cushion structures could effectively buffer the impact of the rockfalls,the ability of rockfalls impact piers could be improved,and up to now,the consequences are very well.