CAJ | 학술논문

在旧路加宽改造过程中,新旧路基结合部容易产生较大的差异变形,导致路面结构的破坏,并降低路堤的稳定性。为了减小结合部的工后差异沉降,运用PLAXIS有限元软件对旧路加宽施工过程中台阶的开挖方案进行数值模拟分析,计算各种开挖方案下新旧路基的差异沉降,提出合理的施工方案。计算结果表明：卸载及加载量越大,新、旧路基在结合部的横向和竖向差异变形也越大,旧路加宽改造时优先选用方式2和方式4这两种台阶开挖方式。
재구로가관개조과정중,신구로기결합부용역산생교대적차이변형,도치로면결구적파배,병강저로제적은정성。위료감소결합부적공후차이침강,운용PLAXIS유한원연건대구로가관시공과정중태계적개알방안진행수치모의분석,계산각충개알방안하신구로기적차이침강,제출합리적시공방안。계산결과표명：사재급가재량월대,신、구로기재결합부적횡향화수향차이변형야월대,구로가관개조시우선선용방식2화방식4저량충태계개알방식。
In the course of old road reform and widen, the junction between old and new subgrade prones to large differences in deformation, which may lead to the destruction of the pavement structure and stability reducing of the embankment. In order to reduce the differential settlement of the junction after the construction process, finite element software PLAXIS was used to simulate and ana- lyze the schemes of excavation about steps during the construction process of old road widening. The different settlements between old and new embankment under all kinds of excavation schemes were calculated, and a reasonable construction scheme was proposed. The calculated results show that, with the greater of unload!ng and loading amount, the different deformations at the junction in both horizontal and vertical directions will be greater. Scheme 2 and 4 should be used in priority in the course of reforming and widening the old road.