乌溪江大桥拱座基础加固

Foundation Reinforcement of Arch Seat for Wuxijiang Bridge

乌溪江大桥主桥为260m的上承式钢管混凝土拱桥,3号拱座位于陡坡上,基岩为中风化花岗岩,节理发育,对基础边坡稳定产生不利影响。通过有限元强度折减法从理论上探讨采用锚筋桩加固拱座基础方案的可行性。研究结果表明:采用锚筋桩加固后能大幅度提高边坡的整体稳定安全系数。为确保工程安全,实际施工中采用了锚筋桩与基底压浆、锚索组合形式对拱座基础进行加固处理。实践表明,加固效果明显,可为类似桥梁基础加固提供参考。

Wuxijiang River Bridge is a concrete-filled steel tubular deck arch bridge with a main span of 260meters.Its arch seat at No.3 is located on a steep slope,where the bedrock is the weathered granite with masses of joints,and is very harmful to the stability of whole foundation slope.The feasibility of reinforcing the arch seat foundation by anchor pile is theoretically discussed through the finite element strength reduction method.The research result shows that the whole stability and safety coefficients of slope can be greatly improved after the reinforcement of anchor pile.In order to ensure the safety of the project,the combining form of anchor pile,base grouting and anchor cable is used in the practical construction to reinforce and treat the foundation of arch seat.The practice shows that the reinforcement effect is obvious,and can be referred for the reinforcement of the similar bridge foundations.