摘要
不同于传统小直径圆形钢波纹管涵洞,大跨径管拱形钢波纹管涵洞在路基工程中的应用与研究较少。依托延安某高速公路工程,详细阐述了现场试验方案,测试了一个少见的9.5 m跨径,6.5 m矢高的管拱形钢波纹管涵洞在路堤回填过程中的受力变形特性,采用数值模拟进一步研究了管涵参数对其受力变形特性的影响,引入土拱效应系数Mf,结合正交试验与数值模拟建立了考虑土拱效应的大跨径管拱形钢波纹管涵洞的土压力计算模型,最后通过现场试验结果验证了计算模型的准确性。研究结果表明:回填过程中管涵的竖向变形大于水平变形,同位置处的波谷应力大于波峰,土拱效应的存在使得管顶土压力与沉降均呈V形分布。回填过程中管顶的变形最大,为36.1 mm,满足变形不超过2%跨径的规范要求,但设计人员应重点关注管涵两侧90°处波谷的应力设计。管涵的螺栓拼接位置建议设置在管周顺时针30°、180°、330°附近。增大波纹尺寸与钢板厚度能够一定程度上减小管涵的变形与应力,但设计阶段应综合考虑成本造价与材料特性。所建立的理论模型计算结果与现场试验结果较为吻合,能够有效反映大跨径管拱形钢波纹管涵洞上部的土压力分布。研究成果可为大跨径管拱形钢波纹管涵洞的设计、施工与理论分析提供参考。
Compared to traditional small-diameter circular corrugated steel plate culverts,there have been few application and research on large-span pipe-arch steel corrugated plate culverts(PACSPCs)in subgrade engineering.Relying on a certain expressway project in Yan’an City,the field test scheme was elaborated in detail,and the mechanical characteristics of a rarely-seen PACSPC with a span of 9.5 m and a rise of 6.5 m during the embankment backfilling were tested.Numerical simulation was adopted to further study the influence of pipe parameters on its mechanical characteristics.The coefficient of soil arching effect Mf was introduced,combining orthogonal experiments and numerical simulations,and an earth pressure calculation model for large-span PACSPCs considering the soil arching effect was established.Finally,the accuracy of the calculation model was verified through the field test results.The results show that during the backfilling,the vertical deformation of the pipe is greater than the horizontal deformation.At the same position,the stress at the wave trough is greater than that at the wave crest.The existence of the soil arching effect makes the earth pressure on the top of the pipe and the settlement both show a V shape distribution.During the backfilling,the deformation at the top of the pipe is the largest,which is 36.1 mm.It meets the specification requirement that deformation should not exceed 2%of the span.However,the designers should pay particular attention to the stress design at the wave trough at 90°on both sides of the pipe.The bolt splicing positions of the pipe are recommended to be set near 30°,180°,and 330°clockwise around the pipe.Increasing the corrugation size and the thickness of the steel plate can reduce the deformation and stress of the pipe to a certain extent,but the cost and material characteristics should be comprehensively considered in the design stage.The calculation results of the established theoretical model are in good agreement with the field test results,effectively reflecting the earth pressure distribution on the upper part of the large-span PACSPC.The research results can provide a reference for the design,construction,and theoretical analysis of large-span PACSPCs.
作者
卞海丁
魏进
王锦涛
BIAN Hai-ding;WEI Jin;WANG Jin-tao(School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China)
出处
《岩土力学》
北大核心
2025年第8期2532-2546,共15页
Rock and Soil Mechanics
基金
陕西省交通运输厅科研项目(No.24-21K&22-24K)
中央高校基本科研业务费专项资金(No.310821173701)。
关键词
钢波纹管涵洞
大跨径
管拱形
受力特性
土压力计算
corrugated steel plate culvert
large-span
pipe-arch
mechanical characteristics
calculation of earth pressure
作者简介
第一作者:卞海丁,男,1997年生,博士研究生,主要从事公路岩土工程、基础工程方面的研究。E-mail:bianhaiding316@163.com;通讯作者:魏进,男,1972年生,博士,副教授,主要从事公路岩土工程、基础工程方面的教学与研究。E-mail:weijin@chd.edu.cn。
