拓宽路基加筋处治适应性分析及优化设计  

Adaptive analysis and optimization design of the reinforcement for widened roads

作　　者：翁效林[1,2] 谢永利[1] 王玮[3] 张留俊[2] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]中交第一公路勘察设计研究院有限公司,陕西西安710068 [3]河南交通职业技术学院,河南郑州450005

出　　处：《广西大学学报（自然科学版）》2011年第4期622-628,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：教育部中央高校基本科研业务费专项资金(CHD2009JC117)

摘　　要：为研究拓宽路基拼接带加筋处治效果及相关设计参数,借助有限元分析软件和大比尺模型试验,针对不同路基填方厚度和不同软基厚度分别展开了加筋处治适应性分析,比较了新老路基拼接带加筋和不加筋两种工况下拓宽路面结构在地基差异沉降和路面加载双重作用下的应变变化,得出了拓宽路基加筋处治适应性分析结果,并开展了加筋处治有限元设计优化分析,得出了拓宽路基加筋处治的合理埋设位置、埋设层数的设计参数。有限元分析表明:拓宽路基荷载下软土地基层厚度超过4 m时,单纯靠加筋处治缓解新旧路基差异沉降效果非常有限,难以彻底解决其所带来的路基路面病害;在地表和路基底部铺设两层土工格栅能够满足经济性和有效性双重要求,筋材在新旧路基拼接带不宜全幅铺设。大比尺模型试验研究结果表明:加筋材料可增大路基的整体回弹模量,减小路基的不均匀变形,起到减小荷载传递的作用,从而使路面结构在荷载作用下的应力应变分布趋于均一,可有效地阻止和延缓路面结构的破坏。Adaptive analysis by the finite element method and large scale model test on the reinforcement of subgrade splice of widened roads concerning various filling height and soft foundation thickness is presented.Comparison was made between reinforced and unreinforced subgrades to obtain the change of strain on the pavement structure that is caused by load and differential settlement.The results indicate that the application of geosynthetics can only obtain limited effect on reducing differential settlement,especially for high fills.Similar phenomena were observed when the thickness of soft foundation goes greater than 4 m.On top of that,a finite element optimization design was made regarding the reinforcement of subgrade splice.The effect of reinforcement was evaluated and compared against major design parameters including embedding location,amount of layers,and scope of application to determine the optimal design.

关 键 词：拓宽路基 加筋 适应性分析 优化设计 

分 类 号：U414.1[交通运输工程—道路与铁道工程]