新旧地基不同固结程度对拓宽路基差异沉降的影响  

Influence of Different Consolidation Degree of New and Old Ground on Differential Settlement in Widening Embankment

作　　者：傅珍[1] 王选仓[2] 陈星光[3] 李宏志 史建平 王磊 

机构地区：[1]长安大学材料学院,西安市710064 [2]长安大学公路学院,西安市710064 [3]广东省公路勘察规划设计院,广州市510507 [4]河南高速安新改建工程项目部,新乡市450003

出　　处：《公路》2008年第5期9-12,共4页Highway

基　　金：交通部西部交通建设科技项目,项目编号200531881213

摘　　要：为了解差异沉降对拓宽道路的影响,应用有限元程序建立了差异沉降的计算模型,从沉降和水平位移方面分析了新旧地基不同固结程度对高速公路拓宽路基的影响。结果表明,新旧地基的固结程度差异会影响沉降曲线的形状,尤其对差异沉降的影响较大。当新路基下地基压缩模量不变,改变老路基下地基压缩模量,最大差异沉降从8.89 cm减小至5.35 cm。但当老路基下地基压缩模量提高到15 M Pa以后,沉降的减小程度减弱。当旧路基下地基压缩模量不变,改变新路基下地基压缩模量,最大差异沉降从7.92 cm减小至3.23 cm。当新路基下地基压缩模量提高到10 M Pa时,沉降的减小最为明显,20 M Pa以后减小趋势变弱。In order to know the differential settlement of the widening embankment, the influence of different consolidation degree of new and old ground on differential settlement in widening embankment is analyzed with the finite element analysis. The result shows that the consolidation degree of the new and old ground will affect settlement curve, especially to the differential settlement. When the ground compression modulus under the new embankment is invariable, changing the ground compression modulus under the old embankment, the biggest differential settlement reduces from 8.89 cm to 5.35 cm. When the ground compression modulus of the old roadbed enhances to 15 MPa, the reducing degree of the settlement is weaken. While when the ground compression modulus under old embankment is invariable ,changing the ground compression modulus under the new embankment, the biggest differential settlement reduces from 7.92 cm to 3.23 cm. When the ground compression modulus of new embankment enhances to 10 MPa, the settlement will reduce evidently, and the reducing degree of the settlement is weaken when 20 MPa.

关 键 词：道路工程 新旧地基 固结程度 差异沉降 拓宽路基 

分 类 号：U418.8[交通运输工程—道路与铁道工程]