摘要
提出以破冰率Rbreak作为桥面冰层破坏的定量评价指标,根据强度理论及能量法计算确定了高弹性桥面冰层破坏形式及破冰率大小,通过在冰层底部不同方向植入初始裂纹,采用断裂力学方法计算了裂纹扩展特征,首次提出了基于断裂力学方法的破冰率修正系数,得到主要结论:采用橡胶颗粒沥青混合料高弹桥面铺装层可实现桥面冰层破坏,且冰层破坏形式为受压破坏;由断裂力学方法计算得到的冰层底部裂纹扩展方式为滑开型开裂;提出以滑开型开裂对受压型破坏的破冰率修正系数为1.81.
The ice-broken rate Rbreak is proposed as quantitative ice broken evaluation index of bridge pave- ment; failure mode and Rbreak value of high elastic bridge pavement is calculated according to strength theory and energy method. After initial crack was implanted along different directions at the bottom of ice layer, crack propagation characteristics are calculated and modification {actor for Rbreak is proposed according to mechanics of fracture for the first time. Main conclusions are drawn as follows. It can achieve ice-broken by using rubber particles asphalt mixture high elastic bridge pavement, the ice fallure form is compression failure. Propagation form of crack at the bottom of ice layer is sliding open type according to mechanics of fracture. The modification factor for Rbreak of sliding open cracking to compression type failure is 1.81.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2013年第2期199-203,256,共6页
Engineering Journal of Wuhan University
关键词
高弹桥面铺装
破冰技术
断裂力学
破冰率
修正系数
high-elastic bridge pavement
ice-broken technologies
mechanics of fracture
ice-broken rate
modification factor
