曲线盾构隧道施工期管片破损机理研究
朱斌
Study on the Segment Damage Mechanism of Curved Shield Tunnels during Construction Stage
ZHU Bin
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作者信息:中铁二十一局集团轨道交通工程有限公司，250117，济南
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Affiliation:China Railway 21st Bureau Group Rail Transit Engineering Co., Ltd., 250117, Jinan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.020
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］盾构隧道管片破损会引起隧道渗水，会影响结构承载力，危及运营安全，故有必要对管片结构破损的机理展开研究。［方法］通过调研统计得出管片病害的发生规律和影响因素，采用ABAQUS软件对不同千斤顶水平推力下管片细部结构、环向螺栓、纵向螺栓以及凹凸榫的受力特征进行数值分析。［结果及结论］管片破损病害发生率自拱顶至拱腰再到拱底逐渐增大，拱底区破损病害发生率最高；管片破损与千斤顶分区推力大小关系密切。数值模拟结果表明：随着总推力值的增大，螺栓最大主应力值逐渐减小，凹凸榫处最大主应力会迅速增加；推力越大，纵向螺栓应力值则越小；当推力过大时，纵向螺栓拉应力趋于0，管片纵向收缩，管片受到的压力急剧增大。
Abstracts:
［Objective］ Damage to shield tunnel segments will cause water seepage in the tunnel, affecting the structural bearing capacity and endanger the operational safety. Therefore, it is necessary to study the mechanism of segment structure damage. ［Method］ Through investigation and statistics, the occurrence law and influencing factors of segment diseases are obtained. ABAQUS software is used to conduct a numerical analysis on the force characteristics of segment detail structure, circumferential bolts, longitudinal bolts and concave-convex tenons under different jack horizontal thrusts. ［Result & Conclusion］ The incidence of segment damage increases gradually from vault to hance and then to arch bottom, and the incidence of damage in arch bottom area is the highest. The segment damage is closely related to the thrust value of the jack partitions. Numerical simulation results show that with the increase of the total thrust value, the maximum principal stress value of the bolt decreases gradually, while the value at the concave-convex tenon increases rapidly. The greater the thrust, the smaller the longitudinal bolt stress value. When the thrust is too large, the longitudinal bolt tensile stress tends to 0, the segment shrinks longitudinally, and the pressure on the segment increases sharply.
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