搭板加筋路基处理路桥过渡段差异沉降研究

Study on Treatment for Differential Settlement of Bridge-subgrade Transition Section with Slab and Reinforced Subgrade

针对路桥过渡段因路基与桥台沉降差较大而产生的桥头跳车现象,文中利用FLAC3D软件建立了桥头结构与搭板加筋路基的分析模型,对比分析搭板长度与土工格栅层数、模量对路桥过渡段差异沉降的影响,结果表明,搭板可以有效避免路桥连接处的错台现象,但易引起二次跳车现象的发生;搭板加筋路基可以有效减小路桥过渡段差异沉降,避免二次跳车现象的发生,提高行车舒适度;布置土工格栅的效果主要体现在路基与地基交界处;格栅模量的增加可以减小道路沉降。

Aiming at the problem of bumping at bridge head caused by the large settlement difference between subgrade and abutment in the transition section of highway and bridge,the analysis model of bridge head structure and reinforced subgrade with approach slab is established by FLAC3D software.The influence of approach slab length,number of geogrid layers and modulus on differential settlement of the transition section of highway and bridge is compared and analyzed.The results show that the approach slab can effectively avoid the phenomenon of staggered abutment at the connection of highway and bridge,but it is easy to cause the occurrence of the second jump phenomenon;the differential settlement of the bridge-subgrade transition section can be effectively reduced by slab and reinforced subgrade,avoiding the second jump phenomenon and improving the driving comfort;the effect of the geogrid arrangement is mainly reflected at the junction of the subgrade and the foundation;the increase of the geogrid modulus can reduce the road settlement.