新溆高速公路两江特大桥桩基受力与变形分析

新化至溆浦高速公路是位于我国西部山区。在这些地区修建高速公路时,往往会遇到一些特殊问题,如两江特大桥陡坡段桥梁桩基安全性问题。与平地上普通的桥梁桩基相比,位于陡坡上的桥梁桩基受力与变形更为复杂,现行的设计计算方法亦不能满足工程实际的需要。通过借助有限差分法,考虑边坡荷载对基桩的影响,对两江特大桥左幅19#墩桥梁桩基的受力与变形进行分析计算。计算发现,桩身最大弯矩和最大剪力作用位置基本位于强风化层和中风化层的分界面附近;考虑边坡荷载作用,计算得到的桩顶水平位移不满足变形要求,且桩身内力较大,必须对边坡进行相应的防护加固设计。

Stress and Deformation Analysis of Liangjiang Grand Bridge Pile Foundation in Xinxu Highway

Xinhua to Xupu’s highway is located in the western mountain area.Some special problem often encountered during construction process,for example,the safety problems of pile foundation set in high and steep slope belongs to Liangjiang grand bridge.The stress and deformation of bridge pile foundation in high and steep slope is more complicated compared to normal pile set in ground.The current design method can’t meet the needs of the practical engineering.This paper analyzed the stress and deformation of 19# pile foundation in Liangjiang grand bridge by using finite difference method considering the influence of slope load.The results show that the Horizontal displacement of the pile head did not meet the requirements of deformation considering the slope load and because of the large pile internal force,a slope protective reinforcement design must be carried out.