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介绍了新型的预制装配式盖板涵施工工法,通过选取两个典型断面开展了现场试验,研究了预制装配式盖板涵台背及涵顶土压力的分布规律和土压力随填土荷载的增长规律.对涵洞盖板和侧墙的位移进行了测试,分析了盖板和侧墙构件的挠曲变形规律,并将测试所得的土压力和构件变形结果与数值模拟结果进行了对比.结果表明,预制装配式涵洞侧墙和盖板的挠度均较小,涵周土压力分布和变化规律均呈现明显的非线性,与现行《公路桥涵设计通用规范》中线性土压力理论存在较大的差异.盖板上垂直土压力中间较小,两侧支撑处较大,近似呈“U”形分布.侧墙水平土压力近似呈“3”形分布,最大土压力位于台帽与涵墙搭接处.所得结果为预制装配式涵洞构件的设计计算及搭接强度的确定提供了依据.
A new type of prefabricated cover culvert construction method is introduced. Field tests are carried out by selecting two typical cross sections. The distribution of pressure on the back and culverts of the prefabricated cover plate culverts and the relationship between earth pressure and the filling load The displacement of the culvert cover and the side wall were tested and the deflection and deformation rules of the cover and the side wall were analyzed.The results of earth pressure and component deformation were compared with the numerical simulation results.Results The results show that the deflections of the prefabricated culvert sidewall and the cover are small, and the distribution and variation of earth pressure on the culvert show obvious nonlinearity, which is quite different from the linear soil pressure theory in the current “Code for Design of Highway Bridges and Culverts” Difference.The vertical earth pressure on the cover is small in the middle and larger on both sides of the cover, approximately in the form of “” “U ” distribution.The horizontal earth pressure at the side wall is approximately “3 ” shape distribution, And the culvert wall overlap.The obtained results provide the basis for the design calculation of the prefabricated culvert member and the determination of the lap strength.