满堂支架施工对邻近高铁桥墩位移影响探究

The influence exploration of full support construction to the displacement of adjacent high-speed rail pier

为探究满堂支架施工过程中对既有高铁桥墩的影响,通过开展现场支架预加载试验测试了高铁桥墩邻近土体的沉降、深层水平位移、孔隙水压力等受力特性,并分析了其位移变化。结果表明:分级加载后,地表沉降出现平缓期、增长期和稳定期三个阶段;土体先产生远离施工区域的水平位移,随后位移量降低;满堂支架施工过程中孔隙水压力持续缓慢上升。施工荷载主要引起桥墩发生横桥向水平位移,整体产生靠近施工区域的轻微转角。

In order to explore the influence of full support construction on the existing high-speed railway pier,the settlement,deep horizontal displacement,pore water pressure and other mechanical characteristics of the adjacent soil mass of the high-speed railway pier were tested through the field support preloading test,and the displacement change was analyzed.The results show that:after the stage loading,the surface settlement appears three stages:flat and slow period,growth period and stability period,the soil first produces horizontal displacement far away from the construction area,and then the displacement decreases,the pore water pressure continues to rise slowly during the construction of full support.The construction load mainly causes the horizontal displacement of the bridge pier in the transverse direction,and the slight angle close to the construction area as a whole.