土体空洞对砖石排水拱涵受力影响研究  

Research on Impacts of the Soil Cavity on the Stress of Masonry Drainage Arch Culverts

作　　者：戴磊 陈逵 Dai Lei;Chen Kui

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《重庆建筑》2024年第4期73-76,共4页Chongqing Architecture

摘　　要：随着越来越多的排水拱涵投入使用,城市排水拱涵的病害也逐渐引起人们的关注,该文选取对砖石排水拱涵受力有较大影响的土体空洞作为研究对象。依托长沙市红旗渠试验段项目,通过对拱涵侧墙及拱圈后土体空洞的位置、大小情况的数值模拟,得到空洞对拱涵结构受力的影响规律。通过分析得到如下结论:空洞的最不利位置为拱趾单侧和双侧空洞,拱腰单侧和双侧空洞次之、侧墙底部单侧和双侧空洞几乎没有影响、拱顶空洞则会使拱涵应力减小。对拱趾单侧及双侧空洞大小进行分析可知:空洞平面内尺寸分为高度和宽度,宽度比高度对拱涵结构影响更大,宽度尺寸小于1.0 h时,拱涵结构应力变化较小,超过这个尺寸,拱涵结构最大拉应力从拱顶转移到拱趾空洞处,在拱趾处极易造成破坏,应当引起重视。As more and more drainage arch culverts are put into use,defects in the urban drainage arch culvert become a major concern.This paper selected one of the defects,soil cavity,which has a great impact on the stress of a masonry drainage arch culvert as the research object.Based on the Hongqi Canal test section project in Changsha City,this paper performed numerical simulations of the locations and sizes of soil cavities in the side wall of the arch culvert and behind the arch ring,thereby yielding the influence law of soil cavities on the stress of an arch culvert structure.The results showed that cavities exerting the most negative impacts on the stress are the unilateral and bilateral ones at the arch toe,followed by unilateral and bilateral cavities at the arch waist,unilateral and bilateral cavities at the bottom of side walls have little effect on the stress,and cavities in the vault would reduce the stress of the arch culvert.Given an analysis of the sizes of cavities at the single and double sides of the arch toe,it’s known that the dimensions in the plane of the cavities are divided into height and width,and the width has a greater influence on the arch culvert structure than the height;When the width is less than 1.0h,the structural force of the arch culvert changes little;and when the width goes beyond 1.0h,the maximum tensile stress of the arch culvert structure transfers from the arch top to the arch toe,so cavities are prone to cause damage at the arch toe,and this should be paid attention to.

关 键 词：拱涵 有限元 土体空洞 最大拉应力 应力比值 

分 类 号：U441[建筑科学—桥梁与隧道工程]