摘要
桩承式加筋路堤与路堤填土加筋技术联合应用于黄土地区路桥过渡段,减小路桥过渡段差异沉降和桥头跳车现象。通过现场试验对桩承式加筋路堤中心轴和路肩对应位置处格栅上、下表面桩顶和桩间土土压力、桩间格栅变形以及加筋路堤各断面格栅上、下表面土压力和格栅变形进行监测分析,研究结果表明:桩承式加筋路堤通过土拱效应和张拉膜效应将路堤荷载向桩顶转移,从而可有效减小桩间土荷载;桩承式加筋路堤中心轴处路堤荷载转移主要以土拱效应为主,以张拉膜效应为辅,而路肩处格栅张拉膜效应较显著,路堤荷载传递由土拱效应和张拉膜效应共同完成,格栅在路肩处发挥作用效果大于路堤中心轴处;路堤加筋技术在桥台附近减载作用明显,随着距桥台距离的增加,减载作用逐渐减弱。
The geogrid-reinforced and pile-supported （GRPS） embankment and the geogrid-reinforced filling technique are employed to treat the bridge approach in loess area so as to reduce the differential settlement and alleviate the bump at the end of the bridge approach. Moreover, the earth pressure on the surfaces above and below the geogrid along the central axis and shoulder of the embankment are measured as well as deformation of the geogrid. The results show that the load on the soil between piles can be reduced effectively due to the soil arching and tensioned membrane effects. In the central axis of the embankment, most of the load is transferred by the soil arching and the tensioned membrane effects, but the tensioned membrane effect is not obvious. At the road shoulders, the tensioned membrane effect increases efficiently and the load is transferred by the soil arching effect together with the tensioned membrane effect. The effect of load transfer is significant at the bridge approach and decreases gradually with the increase of distance from bridge abutment.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第2期355-362,共8页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50978112)
教育部留学回国人员科研启动基金项目(20091341)
华中科技大学研究生科技创新基金项目(HF-08-01-2011-240)
关键词
桩承式加筋路堤
路桥过渡段
现场试验
土拱效应
张拉膜效应
geogrid-reinforced and pile-supported embankment
bridge approach
field experiment
soil arching effect
tensioned membrane effect
