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为探明山区地形条件对高填方涵洞涵顶土压力及沉降特性的影响,基于数值仿真模拟,分析不同涵洞结构断面型式、沟谷宽度、沟谷坡度条件下高填方涵洞涵顶土压力及其涵顶土体沉降变形规律,并结合计算结果提出相关的工程技术建议。研究结果表明:(1)沟谷宽度B与涵顶垂直土压力σz及土压力集中系数Ks呈正相关,沟谷坡度α与涵顶垂直土压力σz及土压力集中系数Ks呈负相关;(2)沟谷宽度小于5D、沟谷坡度大于45°时,涵顶土压力集中系数Ks较小,涵洞结构受力最有利,高填方涵洞施工应充分利用原有地形地貌,尽可能保留边坡;(3)不同涵型涵顶土压力及沉降变形特性差异较大,在高填方涵洞设计中应掌握不同断面型式涵洞各位置处的受力变形情况以及最不利点位置,综合考虑进行涵洞断面结构型式的合理选型。
In order to find out the influence of mountainous topography on the culvert pressure and settlement characteristics of culvert culvert in high fill culverts, based on the numerical simulation, the culvert pressure of culvert culvert in high embankment under different culvert structures and its slope conditions is analyzed Culvert top soil settlement and deformation law, combined with the calculation results put forward relevant engineering and technical advice. The results show that: (1) The width of the valley B is positively correlated with the vertical soil pressure σz and the soil pressure concentration factor Ks, and the slope gradient α is negatively correlated with the vertical soil pressure σz and the earth pressure concentration coefficient Ks. (2) When the width is less than 5D and the slope of the valley is greater than 45 °, the stress concentration coefficient of culvert roof is smaller and the stress of culvert structure is the most favorable. The construction of high fill culvert should make full use of the original topography to keep the slope as much as possible. (3) The top soil pressure and settlement deformation characteristics of different culverts vary greatly. In the design of high culvert culverts, the deformation and deformation of the culvert at different sections and the most unfavorable point positions should be grasped. Considering the structure type of culverts Reasonable selection.