装配式盖板涵土压力和变形的现场试验研究

发布时间：2019-06-01 11:32

【摘要】：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.
[Abstract]:This paper introduces a new construction method of prefabricated cover plate culvert. By selecting two typical sections to carry out field tests, the distribution law of earth pressure on the back and top of prefabricated cover plate culvert and the increasing law of earth pressure with filling load are studied. The displacement of culvert cover plate and side wall is measured, the deflection deformation law of cover plate and side wall member is analyzed, and the measured earth pressure and member deformation results are compared with the numerical simulation results. The results show that the deflection of the side wall and cover plate of prefabricated culvert is small, and the distribution and variation of earth pressure around culvert are obviously nonlinear, which is quite different from the linear earth pressure theory in the current General Code for Design of Highway Bridges and culverts. The vertical earth pressure on the cover plate is small in the middle and the support on both sides is larger, which is approximately "U" shaped distribution. The horizontal earth pressure of the side wall is approximately "3" shape distribution, and the maximum earth pressure is located at the joint of the cap and the culvert wall. The results provide a basis for the design and calculation of prefabricated culvert members and the determination of lap strength.
【作者单位】：山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室;湖北工业大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(51208187) 教育部重点项目(2010133) 黄土地区公路建设与养护技术交通行业重点实验室开放课题(KLTLR-Y12-11)
【分类号】：TU43

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