盾构隧道管片螺栓连接纵缝压弯承载力解析  

Analysis of compressive bending capacity in bolted circumferential joint of shield tunnels

作　　者：王海峰 高晓静[2] 李鹏飞[2] 贾子琦 WANG Haifeng;GAO Xiaojing;LI Pengfei;JIA Ziqi(Nantong railway construction component Co.,Ltd.,Nantong Jiangsu 226000,China;Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]南通铁建建设构件有限公司,江苏南通226000 [2]北京工业大学城市安全与灾害工程教育部重点实验室,北京市100124

出　　处：《北京交通大学学报》2022年第6期114-122,共9页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金(51978019,52278382);北京市自然科学基金(8222004)。

摘　　要：盾构隧道管片接头的力学特性直接决定了隧道结构的整体性及其承载能力.为明确管片螺栓连接接头受力全过程的力学特性,建立了压弯作用下管片环向接头分段受力性态的理论解析模型.在接头受力的第四阶段引入了外缘混凝土受压区高度影响系数α,通过正交分析及数值模拟明确了α的主要影响因素为接头空隙,并进一步明确了外缘混凝土压碎时α的计算公式,且对于我国绝大多数地铁盾构隧道α可近似取为0.2,最后通过数值分析验证了接头分段力学模型的合理性.研究结果表明:基于管片纵缝承压过程的4个阶段及外缘混凝土受压区高度影响系数的理论公式,可提出计算盾构隧道管片螺栓连接纵缝承压全过程的理论解析模型,利用该模型可分析任意荷载作用下管片接头的力学状态,可为管片接头设计及病害预测提供相关理论依据.The integrity and bearing capacity of shield tunnel structure are closely related to the mechanical properties of segment joint. To clarify the mechanical characteristics of the whole bearing process of the bolted circumferential joint, a theoretical analytical model of the segmental force in the joints is established to describe bearing behaviors of the joint under the compressive bending load. In the stage Ⅳ of joint stressing, the influence coefficient α on the height of the concrete pressure zone at the outer edge is introduced. Through orthogonal analysis and numerical simulation, it is clear that the main influencing factor of α is the joint gap, and the calculation formula of α when the outer edge concrete is crushed is further clarified. The equation shows that for most subway shield tunnels in China,α can be approximately as 0.2. Finally, the rationality of the joint segmented mechanical model is verified by numerical analysis. The results show that based on the 4 stages of the longitudinal joint bearing process and the theoretical formula of the height influence coefficient in the outer edge concrete pressure zone, a theoretical analytical model can be proposed to calculate the whole longitudinal joint bearing process of the bolted circumferential joints. The model can be used to analyze the mechanical state of segment joint under any load, which can provide relevant theoretical basis for the design of segment joint and disease prediction.

关 键 词：盾构隧道 管片接头 接头模型 破坏机理 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]