钢纤维混凝土管片斜螺栓接头力学性能研究  

Mechanical Performance of Steel Fiber Reinforced Concrete Segment with Oblique Bolt Joints

作　　者：阳卫卫 贾永刚 吴帆 鲁卫东 崔宏志[3] 陈湘生[3] YANG Weiwei;JIA Yonggang;WU Fan;LU Weidong;CUI Hongzhi;CHEN Xiangsheng(The Shenzhen Metro Group Co.,Ltd.,Shenzhen,Guangdong 518000;Beijing Urban Construction Design and Development Group Co.,Ltd.,Beijing 100037;Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518060)

机构地区：[1]深圳市地铁集团有限公司,广东深圳518000 [2]北京城建设计发展集团股份有限公司,北京100037 [3]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《都市快轨交通》2024年第6期115-122,148,共9页Urban Rapid Rail Transit

基　　金：深圳市地铁集团有限公司科研咨询服务项目(SZDTJSZX-ZC-2020-0022);国家重点研发计划项目(2022YFC3800900)。

摘　　要：为探究斜螺栓接头在小直径盾构隧道中的适用性,明晰斜螺栓接头的力学特性及破坏机理,本文以外径6.2 m、厚度350 mm的管片结构为原型,开展4种水平轴力工况下钢纤维混凝土管片斜螺栓接头抗弯性能试验,分析不同轴力水平下管片接头的变形特征及抗弯性能,研究破坏工况下管片接头的承载特性和破坏机理。研究结果表明:管片接头承受的轴力越高,则接头抗弯刚度越高,接缝张开所需弯矩越大,即可通过提高螺栓预紧力或施加环向预应力主动提高接头轴力,以提高接头刚度;密封垫压缩后会造成密封槽处应力集中,设计中应选取匹配的密封垫或优化密封槽构造;破坏工况下,λ达到0.89时接缝顶部产生初始裂纹,最终因接缝顶部混凝土压溃而突然破坏,但斜螺栓未屈服,表明增强顶部混凝土抗压强度和降低斜螺栓插入角对接头承载力的提高是有利的。研究结论可用于指导管片接头设计。This study explores the applicability of oblique bolt joints in small-diameter shield tunnel beam melting(TBM)tunnels,clarifying their mechanical properties and damage mechanisms.A segment structure with an external diameter of 6.2 m and a thickness of 350 mm was utilized as a prototype for conducting bending performance tests on steel fiber concrete segments with oblique bolted joints under four different horizontal axial force conditions.The analysis focused on the deformation characteristics and flexural performance of the segment joints across varying axial force levels,as well as the failure processes and mechanical properties under failure conditions.The results showed that the higher the axial force on the segment joints,the higher the joint stiffness,requiring larger bending moments to open the joint.In other words,the joint axial force can be actively increased by increasing the bolt preload or by applying annular prestressing to improve the joint stiffness.Compression of the sealing gasket under joint axial force results in stress concentrations within the sealing groove.Therefore,selecting an appropriate sealing gasket or optimizing the sealing groove structure is essential in the design process.The study also found that enhancing the compressive strength of the top concrete and reducing the insertion angle of the oblique bolt significantly improve joint bearing capacity.These findings provide valuable guidance for the design of segment joints.

关 键 词：城市轨道交通 盾构 管片接头 钢纤维混凝土 抗弯性能试验 斜螺栓 力学性能 

分 类 号：TU93[建筑科学—结构工程]