| 螺栓对盾构隧道管片接头抗弯承载力的影响 |
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| 引用本文： | 张力,何川,封坤,郭文琦,张景轩,肖明清.螺栓对盾构隧道管片接头抗弯承载力的影响[J].中国公路学报,2022,35(11):195-203. |
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| 作者姓名： | 张力 何川 封坤 郭文琦 张景轩 肖明清 |
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| 作者单位： | 1. 西南交通大学 交通隧道工程教育部重点实验室, 四川 成都 610031;2. 中铁第四勘察设计院集团有限公司, 湖北 武汉 430063 |
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| 基金项目： | 国家自然科学基金项目（52078430）；铁四院科技研究开发计划课题（2018K120） |
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| 摘 要： | 抗弯承载力是管片接头的重要力学属性，可为评价管片接头或整环结构承载安全提供重要参考，而螺栓是管片接头的重要组成部分，由于实际工程中接头连接螺栓可能失效，因此研究螺栓对于管片接头抗弯承载力的影响十分必要。为此，首先基于经典钢筋混凝土构件抗弯理论和压弯荷载下管片接头受力特征，建立了考虑复杂接缝面构造的接头抗弯承载力理论模型，然后分别开展有螺栓接头和无螺栓接头抗弯破坏试验对理论模型进行验证，最后基于理论模型，针对厚度0.40~0.65 m的6种典型管片接头，分析有、无螺栓对接头抗弯承载力的影响。研究结果表明：高轴压下，有螺栓管片接头和无螺栓管片接头的破坏过程分别可分为3个阶段和2个阶段，接头受压区边缘混凝土接触后破坏现象开始密集产生；正负弯矩下，有螺栓和无螺栓接头抗弯承载力理论模型与足尺试验的最大相对误差分别为5.6%和6.1%，表明理论模型具有较高的计算精度；对于不同厚度管片接头，轴压比大于0.309~0.455（正弯，负弯为0.417~0.499）或偏心距小于0.101~0.166 m （正弯，负弯为0.071 1~0.099 2 m）时，螺栓对其抗弯承载力无影响，因此当管片接头处出现连接螺栓失效等情况时，可适当增大接头轴力或降低接头偏心距，以减小螺栓对接头抗弯承载安全的影响。
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| 关 键 词： | 隧道工程 抗弯承载力 理论分析 管片接头 足尺试验 无螺栓 |
| 收稿时间： | 2021-05-01 |
Influence of Bolts on the Compression-bending Capacity of Segmental Joints of Shield Tunnels |
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| ZHANG Li,HE Chuan,FENG Kun,GUO Wen-qi,ZHANG Jing-xuan,XIAO Ming-qing.Influence of Bolts on the Compression-bending Capacity of Segmental Joints of Shield Tunnels[J].China Journal of Highway and Transport,2022,35(11):195-203. |
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| Authors: | ZHANG Li HE Chuan FENG Kun GUO Wen-qi ZHANG Jing-xuan XIAO Ming-qing |
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| Affiliation: | 1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;2. China Railway Siyuan Survey and Design Group Co. Ltd., Wuhan 430063, Hubei, China |
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| Abstract: | The compression-bending capacity is an important mechanical property of a segmental joint, which can provide a key reference for evaluating its compression-bending safety. Because the connecting bolt in a segmental joint may fail in actual engineering; the compression-bending capacity is significant. Therefore, the influence of bolts on the compression-bending capacity of segmental joints should be studied. Based on the classic flexural theory of reinforced concrete members and force characteristics of the segmental joint under compression-bending loads, a set of theoretical models for the compression-bending capacity considering the complex joint surface were first established in this study. Subsequently, compression-bending failure tests of bolted and non-bolted segmental joints were carried out to verify the proposed theoretical model. Finally, the effect of bolts on the compression-bending capacity of segmental joints with six different thicknesses in the range of 0.40-0.65 m was analyzed using the presented theoretical model. Results showed that under high axial-compression conditions, the failure process of bolted and non-bolted joints could be divided into three and two stages respectively, and failure phenomenon began to intensively occur after the contact of concretes at the edge of compression zone. In addition, under positive and negative bending moments, maximum relative errors between the theoretical model and full-scale test were 5.6% and 6.1%, respectively, indicating that the theoretical model has high calculation accuracy. Furthermore, for segmental joints with different thicknesses, when the axial-compression ratio is greater than 0.309-0.455 under positive bending moment and 0.417-0.499 under negative bending moment, or the eccentricity is less than 0.101-0.166 m under positive bending moment and 0.071 1-0.099 2 m under negative bending moment, the bolt does not affect its compression-bending capacity. Therefore, when the connecting bolt fails, the axial force of the joint can be appropriately increased or the eccentricity of the joint can be appropriately decreased to reduce the influence of the bolt on the compression-bending safety of the joint. |
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| Keywords: | tunnel engineering compression-bending capacity theoretical analysis segmental joint full-scale test non-bolted |
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