上埋式盖板涵受力特性及影响因素研究

›› 2011, Vol. 32 ›› Issue (1): 199-206.

上埋式盖板涵受力特性及影响因素研究

陈保国^{1, 2}，骆瑞萍³，孙金山^1,2

1. 中国地质大学岩土钻掘与防护教育部工程研究中心，武汉 430074； 2. 中国地质大学工程学院，武汉 430074；3. 湖北省建筑科学研究设计院，武汉 430071

收稿日期:2009-06-03 出版日期:2011-01-10 发布日期:2011-01-19
作者简介:陈保国，男，1981年生，博士，讲师，主要从事岩土工程相关的教学与科研工作。
基金资助:
中央高校基本科研业务费专项资金资助项目(No. CUGL090212，No. CUGL090218)；国家自然科学基金资助项目(No. 50978112)。中央高校基本科研业务费专项资金资助项目(No. CUGL090212，No. CUGL090218)；国家自然科学基金资助项目(No. 50978112)。

Study of stress characteristics and its influencing factors of embankment installation slab-culverts

CHEN Bao-guo ^{1, 2}，LUO Rui-ping³，SUN Jin-shan ^{1, 2}

1. Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education, China University of Geosciences, Wuhan 430074, China; 2. Engineering Faculty, China University of Geosciences, Wuhan 430074, China; 3. Hubei Institute of Building Research and Design, Wuhan 430071, China

Received:2009-06-03 Online:2011-01-10 Published:2011-01-19

摘要/Abstract

摘要：

现行公路桥涵设计通用规范中的土压力计算方法不能准确反映上埋式盖板涵的实际受力状态。结合现场测试和有限元数值模拟方法，分析了上埋式盖板涵在路堤填土荷载作用下的变形规律和受力特性，讨论了填土高度、填土性质、涵洞几何尺寸及地基弹性模量等因素对结构变形和受力状态的影响。研究结果表明：在填土荷载作用下，涵洞顶板、底板和侧墙均产生弯曲卸载现象，涵洞顶板、底板垂直土压力以及侧墙的水平土压力呈非线性分布，其实际受力状态与规范方法计算的结果存在较大差异。随着填土高度的增加，涵洞顶板和底板跨中及侧墙7h/8附近（h为涵洞侧墙高度）受到的土压力增长较慢，而在其他位置处土压力增长迅速。上埋式盖板涵设计和施工应综合考虑各种因素对结构受力状态的影响。

关键词: 涵洞, 受力特性, 影响因素, 现场测试, 数值模拟

Abstract:

The actual stress state of embankment installation slab-culvert was not accurately reflected by the calculation method of earth pressure in the prevailing Chinese General Code for Design of Highway Bridges and Culverts. So the deformation laws and stress characteristics of embankment installation slab-culvert under fill-load were studied based on field test and FEM numerical simulation. Meanwhile, the key influencing factors, such as the height of embankment fill, the characteristics of fill, the dimensions of the culvert and the elastic modulus of the ground on the structure deformation and stress characteristics were also discussed. It is shown that the bending unloading effects of the top slab, the bottom slab and the lateral walls of the culvert were generated under the fill load, the distributions of vertical earth pressure on the top slab and the bottom slab, as well as the lateral earth pressure on the walls are all nonlinear, they are significantly different form the results calculated by the code method. With the increasing of the embankment fill, the earth pressures on the mid-span of the top slab and the bottom slab, as well as the position near 7h/8 (h is the height of the culvert wall) of the walls has a trend of slow increase; however, they are rapidly increased away from the above- mentioned position. The influence of the factors on the stress state of embankment installation slab-culverts should be comprehensively considered in the design and construction procedure.

Key words: culvert, stress characteristics, influencing factor, field test, numerical simulation

中图分类号:

TU 470

陈保国，骆瑞萍，孙金山. 上埋式盖板涵受力特性及影响因素研究[J]. , 2011, 32(1): 199-206.

CHEN Bao-guo，LUO Rui-ping，SUN Jin-shan. Study of stress characteristics and its influencing factors of embankment installation slab-culverts[J]. , 2011, 32(1): 199-206.

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