高架桥跨既有下穿隧道桥墩基础分析

Pier foundation analysis of viaduct crossing the existing tunnel

以沿既有双向6车道下穿隧道中心线重合布置高架桥设计为例,通过交通流量分析和方案比较后,将高架桥墩基础置于既有下穿隧道中心底部以下土体上,并对其内应力及地基土附加应力进行了联合计算,计算结果满足现行规范要求,该解决方案为以后类似工程提供了可行的参考。

This article prefers a plan of the viaduct alongside the center line of existing tunnel with 6 two-way lanes. Based on the analysis of the traffic flow and the layout comparison, the pier foundation set on the center lane of the existing tunnel is utilized. On the basis of conjoint analysis including the internal stress in both the tunnel frame and the pier foundation, as well as the subsidiary stress of foundation soil, this article provides a reference for a solution meeting the requirements of the codes of those similar projects.