基于力学响应分析的道路改扩建反开挖施工新旧路面搭接位置选择研究
Research on the Selection of Overlapping Position of New and Old Pavement in Reverse Excavation Construction of Road Reconstruction and Expansion Based on Mechanical Response Analysis

我国经济正进入工业化、信息化和跳跃式发展阶段，经济的快速发展，需要方便、快捷、安全的交通服务。随着经济的不断发展，越来越多早期建成的双向4车道高速公路由于通行能力不足、服务水平低下、安全事故频发等原因，已经不能满足日益增长的交通需求，急需进行切实可行的改造升级或扩容建设。相对于改建公路而言，加宽旧路路基能充分利用原有路基，缩短建设工期，减少建设用地。本文采用有限元分析软件PLAXIS对济青改扩建反开挖施工中两种新旧路面搭接方案进行对比，研究不同工况下搭接方案的路表弯沉、沥青层底拉应变和路基顶压应变等指标，分析不同新旧路面搭接方案的整体性能，研究结果表明两种工况具有相近的整体性能，但工况二需要加强竖向搭接界面处连接强度。
China’s economy is entering the stage of industrialization, informatization and leaping development. The rapid development of the economy requires convenient, fast and safe transportation services. With the continuous economic development, more and more two-way 4-lane expressways built early due to insufficient capacity, low service levels, frequent safety accidents, etc., have been unable to meet the increasing traffic demand and urgently need practical transformation and upgrading or expansion of construction. Compared with rebuilding roads, widening the old roadbed can make full use of the original roadbed, shorten the construction period, and reduce the construction land. In this paper, the finite element analysis software PLAXIS is used to compare the two new and old pavement overlapping schemes in the reverse excavation construction of the reconstruction and expansion of Jiqing, and to study the road surface deflection, the tensile strain of the asphalt layer and the top pressure of the subgrade under different working conditions. Analyze the overall performance of different new and old pavement overlapping schemes with indicators such as strain. The research results show that the two working conditions have similar overall performance, but the second working condition needs to strengthen the connection strength at the vertical lap interface.