摘要
根据山区公路改扩建工程的特点,结合重庆某山区公路的改扩建工程,采用FLAC3D有限元进行数值模拟,对山区改扩建公路的路基横向变形规律、路基断面形式、路基边坡稳定性进行了研究。结果表明,随着路基拓宽的逐渐增加,老路基沉降变形和新路基的沉降量随之增大,随着新老路基结合部的移动,最大沉降点也随之移动。在新老路基结合的位置,沉降值达到最大;老路基一次荷载作用后,其拓宽宽度和沉降变形联系较小,沉降变形基本不变,随拓宽宽度的增大,沉降变形随之增大。随共同作用层的增大,差异沉降随之增大。在共同作用层设置土工格栅前后,施工期路基沉降量变化较小,运行期路基沉降量变化则比较明显。当具有较大变形量时,在土工格栅设置后,变形量有较大的降低。
According to the characteristics of the highway reconstruction and expansion project in mountain area,this paper studies the lateral deformation law of subgrade,the form of subgrade and the stability of subgrade slope by FLAC3D finite element method,combining with the reconstruction and extension project of a mountain road in Chongqing.The results show that the settlement deformation of the old subgrade and the settlement of the new subgrade increase with the widening of the subgrade,and the maximum settlement point also moves with the movement of the joint between the new and old subgrade.The settlement of the new roadbed increases with the widening width of the roadbed.In the combination of the old and old subgrade,the settlement value reaches the maximum,and the widening width and settlement deformation are less associated with the old road base load,and the settlement deformation is basically unchanged.With the widening widening,the settlement deformation increases.With the increase of the interaction layer,differential settlement increases.Before and after setting up geogrids,the settlement of subgrade changes little during construction period,and the settlement of roadbed in operation period is more obvious.When the deformation is large,the deformation of the geogrid will be greatly reduced.
作者
李晓
纪伦
钟勇
LI Xiao;JI Lun;ZHONG Yong(Guangxi Urban-Rural Planning Design Institute,Nanning,Guangxi 530022,China;School of Transportation Science and Engineering,Haerbin Institute of Technology,Harbin,Heilongjiang 150090,China)
出处
《公路工程》
北大核心
2018年第6期283-287,314,共6页
Highway Engineering
关键词
FLAC3D有限元
山区
变形
新老路基
公路拓宽
FLAC3D finite element
mountain area
deformation
new and old roadbed
highway widening
