基于吉林省路况的新型预制装配式箱涵结构的力学性能

Mechanical properties of new prefabricated box culvert structure based on road conditions in Jilin Province

四构件组合式预制装配式箱涵是一种新型涵体结构,其在分层填压过程中的受力变形特性尚不明确。本文依托铁科高速公路松原至通榆段新建高速公路建设项目,对此新型涵体结构进行了现场试验,分析了各分层填压施工过程中的结构受力变形特性,建立了涵-土结构有限元模型,将理论与实测结果进行对比,以验证模型的正确性,并拓展分析了土体弹模、填土高度对新型涵体结构力学性能的影响规律。研究表明:随着分层填压高度的不断增加,上顶板持续下凹,左、右侧墙持续外凸,且在回填过程中选择弹性模量大的回填土体,对涵体结构受力变形性能有积极影响,尤其在高填土的结构回填中,提升幅度更为明显;车辆活载对涵体受力变形的影响随着填土高度的增加而逐渐减小。

The combined prefabricated box culvert with four members is a new type of culvert structure.Based on the construction project of the new expressway between Songyuan and Tongyu section of Tieke expressway in Jilin Province,the field test of the new culvert structure is carried out,and the stress and deformation characteristics of the structure during the construction of different layers are analyzed.The finite element model of culvert-soil structure is established.The theoretical and measured results are compared to verify the correctness of the model.The results show that with the continuous increase of the layered filling height,the upper roof continuously recedes and the left and right side walls continuously protrude,and the selection of backfill soil with large elastic modulus in the backfilling process has a positive impact on the stress and deformation performance of the box culvert.The influence of vehicle live load on bearing deformation of culvert decreases with the increase in the filling height.