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高填方涵洞广泛应用于山区高速公路建设中,高填方涵洞上覆填土荷载较大,且其受力特性复杂,严重影响了涵洞的使用性能。本文针对桩承式加筋减载涵洞新技术,建立了桩承式加筋减载涵洞数值模型,分析了该技术的作用效果。最后,对该技术的主要影响因素进行了参数分析。研究结果表明该技术通过土拱效应和张拉膜效应,可使大部分路堤荷载传递至桩顶,并沿桩身传递至下卧持力层。涵顶加筋减载效果显著提高,涵顶土压力减小。同时,涵洞侧墙弯矩和剪力减小,涵底沉降有所减小。
High-filled culverts are widely used in the construction of highway in mountainous area. The high-fill culverts have a large load on the overburden, and their stress characteristics are complex, which seriously affects the serviceability of culverts. Aiming at the new technology of pile-supported reinforced culvert with load-bearing culverts, a numerical model of pile-supported reinforced culverts with load-bearing culverts is established and the effect of this technique is analyzed. Finally, the main influencing factors of the technology are analyzed. The results show that through the soil arching effect and the tension membrane effect, most of the embankment load can be transmitted to the top of the pile and transferred to the underburden along the pile body. Reinforced culvert load shedding effect significantly increased, culvert pressure decreases. At the same time, the bending moment and shear of the culvert sidewalls decrease, and the settlement of the culvert decreases.