高填方涵洞受力特性现场测试及数值模拟研究

发布时间：2018-02-28 23:03

本文关键词： 道路工程垂直土压力土压力集中系数涵洞偏载效应　出处：《郑州大学学报(工学版)》2014年03期 　论文类型：期刊论文

【摘要】：依托岢临高速公路高填方涵洞工程,对高填方路堤下混凝土拱涵垂直土压力及涵洞拱圈应力进行了现场跟踪观测,分析了涵顶土压力及拱圈应力的分布情况及演变规律,同时基于有限差分软件Flac3D计算出高填方路堤的应力场和位移场,对现场实测数据进行了验证和分析.研究结果表明:由于涵洞结构与路堤填土之间存在明显刚度差异,造成高填方涵洞顶部形成土压力集中;涵顶土压力集中系数随填土高度的增加而增大,并逐渐趋于稳定;高填方涵洞拱圈内侧最大拉应力位于拱顶,而最大压应力则位于拱腰与拱脚之间,建议在涵洞拱圈内侧布设适量钢筋,防止涵洞开裂破坏;边坡可有效分担填土荷载,当涵洞靠近边坡修筑时,应考虑偏载效应对涵洞结构受力的影响.
[Abstract]:Based on the high fill culvert project of Ke Lin Expressway, the vertical earth pressure and arch circle stress of concrete arch culvert under high fill embankment are followed up and observed on the spot, and the distribution and evolution law of culvert top earth pressure and arch ring stress are analyzed. At the same time, based on the finite difference software Flac3D, the stress field and displacement field of high fill embankment are calculated, and the field measured data are verified and analyzed. The results show that there are obvious stiffness differences between culvert structure and embankment fill. The soil pressure concentration is formed at the top of the culvert with high fill, and the coefficient of soil pressure concentration increases with the increase of the height of the culvert, and the maximum tensile stress of the arch ring of the culvert is located at the top of the culvert, and the soil pressure concentration coefficient increases with the increase of the height of the culvert. However, the maximum compressive stress lies between the arch and the arch foot. It is suggested that appropriate reinforcement should be placed on the inner side of the culvert arch ring to prevent the culvert from cracking and destroying. The slope can effectively share the fill load when the culvert is close to the slope. The effect of eccentric load on the stress of culvert structure should be considered.
【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;
【基金】：山西省交通运输厅科研计划项目(2012-1-3)
【分类号】：U449

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