柳林江大桥南段旧路处治及工后沉降预测  

Treatment of Old Road in the Southern Section of Liulinjiang Bridge and Its Remaining Settlement Forecast

作　　者：赵冰[1] 侯佳琳[1] 宋毅[1,2] 何贤锋 卢毅[4] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410114 [2]烟台三维岩土工程技术有限公司,山东烟台264002 [3]长沙市交通局,长沙410004 [4]长沙理工大学人事处,长沙410114

出　　处：《地下空间与工程学报》2011年第6期1246-1250,1257,共6页Chinese Journal of Underground Space and Engineering

基　　金：交通部应用基础研究项目(2009-319-825-100);湖南省自然科学基金资助项目(09JJ6080)

摘　　要：根据现场勘察成果,柳林江大桥南段公路旧路拓宽工程的软土工程力学性质差,且分布广泛,厚度较大。道路回填时,随着时间及上部荷载的增长,不均匀沉降会加剧。为了保证工程安全和施工进度,需对路基处治做出优化及并预测工后沉降。本文对柳林江大桥南段公路软土旧路拓宽所采用的反压护道处治方案做出数值模拟和优化,应用Flac二次开发得到的广义Bingham体流变本构模型预测路基的工后沉降。结果表明,广义Bingham体模型能够很好地模拟柳林江软土的早期流变过程,能准确反映其软土路基的早期流变特性。According to the site survey results,the mechanical properties of soft soil at the old road of the Liulinjiang bridge are poor,the soil is widespread and thick.With time and the upper load growth,the uneven settlement will increase while backfilling the road.To ensure public safety and construction progress,it＇s necessary to optimize the measures of subgrade treatment and predict the remaining settlement.The back berms which was used to widen the old road of the Liulinjiang bridge（southern section）was simulated and optimized with FLAC5.0 code.The generalized Bingham rheological constitutive model was secondary developed in FLAC5.0 code and the remaining settlement was obtained by this constitutive model.The results show that the generalized Bingham body model can simulate the Liulinjiang early rheological process of soft soil,and accurately reflect the early rheological properties of the soft soil subgrade.

关 键 词：软土流变 反压护道 FLAC二次开发 工后沉降 广义Bingham 

分 类 号：TU478[建筑科学—结构工程]