摘要
为研究不同形式缺陷对衬砌结构受力的影响,通过模型试验模拟不同形式的缺陷,分析衬砌结构不同部位弯矩、轴力与安全系数的变化。结果表明:边墙与仰拱连接处缺陷使衬砌拱腰与仰拱中部处的弯矩与轴力增大,拱顶处的弯矩与轴力减小,缺陷形式不同对衬砌不同部位的影响效果不同;当仅存在混凝土疏松缺陷或钢筋未连接缺陷时,衬砌结构受力的主要影响部位为拱腰与边墙,当两种缺陷共存时,拱顶与仰拱中部也受到较大影响;混凝土疏松缺陷对衬砌结构安全系数的影响总体上大于钢筋未连接缺陷,主要影响区域为拱腰与边墙两处,当两种缺陷共存时,拱腰与仰拱中部处安全系数的下降较明显,分别为52.03%与32.40%。缺陷对拱腰与仰拱中部处安全系数的影响效果大于拱顶与边墙处,施工时需严格控制此处混凝土浇筑质量,保证成型后的强度,并适当提高此处浇筑厚度,使其有较高的安全储备。
In order to study the influence of different forms of defects on the stress of lining structure,through the model test,different forms of defects were simulated,and the changes of bending moment,axial force and safety factor at different parts of lining structure were analyzed.The results showed that the defects at the connection between the side wall and the inverted arch increased the bending moment and axial force at the middle of the lining arch waist and the inverted arch,and decreased the bending moment and axial force at the vault.According to the different forms of defects,the effects on different parts of the lining were different.When there were only concrete shrinkage defects or unconnected steel defects,the main influence parts of lining structure were haunch and side wall.When the two defects coexisted,the middle part of vault and inverted arch would also be greatly affected.The influence of concrete loose defects on the safety factor of lining structure was generally greater than that of unconnected defects of steel bars.The main influence areas were arch waist and side wall.When the two defects coexisted,the safety factor at the middle of arch waist and invert decreased obviously,which was 52.03%and 32.40%respectively.The effect of defects on the safety factor at the middle of the hance and inverted arch was greater than that at the vault and side wall.During construction,the quality of concrete pouring here should be strictly controlled to ensure the strength after forming,and the pouring thickness can be appropriately increased to make it have a higher safety reserve.
作者
周旭明
石钰锋
张利敏
张慧鹏
曹成威
陈昭阳
ZHOU Xuming;SHI Yufeng;ZHANG Limin;ZHANG Huipeng;CAO Chengwei;CHEN Zhaoyang(Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi,China;Jiangxi Underground Space Technology Development Engineering Research Center,Nanchang 330013,Jiangxi,China;Nanchang Rail Transit Group Co.,Ltd.,Nanchang 330038,Jiangxi,China)
出处
《隧道与地下工程灾害防治》
2023年第1期74-80,共7页
Hazard Control in Tunnelling and Underground Engineering
基金
国家自然科学基金面上资助项目(42177162)。
