雅康路五里沟右线大桥抗泥石流冲击性能研究

A Study of the Anti-Debris-Flow Performance of the Right-Sided Bridge at Wuligou of the Ya′an-Kangding Highway

泥石流对桥墩的冲击破坏一直以来都是工程领域十分关注的问题,但目前关于泥石流浆液以及石块对结构物持续动荷载冲击的研究还不够深入,设计环节也较少涉及桥梁的抗泥石流冲击问题。鉴于此,以雅康路五里沟右线大桥为例,分析了泥石流在爆发过程中的冲击荷载形式及其计算方法,并通过数值模拟分析了桥墩在泥石流浆液和石块联合冲击作用下的受力状态以及桥墩的水平位移波动规律,最后结合计算过程中出现的问题提出了相应的预防措施,对类似工程具有较强的参考意义。

The damage of debrisflow to bridge piers is always a problem that attracts much attention of people in the engineering field. However, the present study of the damage of the continuous live loads of the mud and rocks of debris flow to structures is far from enough, and the design of bridges also seldom takes account of the problem of the debris-flow-impact resistance of bridges when they are designed. In view of the above-mentioned cause, the shock loading forms and calculation method of debris flow in the process of its explosion,with the Wuligou Bridge of the Yaran-Kangding Highway as a practical example,are analyzed in the paper,upon the basis of which the patterns of the stress states and the law of the hor- izontal displacement of the pier under the joint action of slurry and stones are numerically simulated, with corresponding protec- tive measures presented to solve the problems discussed in the paper. The paper may serve as a very useful reference for other similar projects.