大断面深埋高水压盾构隧道实测内力反算与分析

发布时间：2018-05-27 09:28

本文选题：盾构隧道 + 现场监测　；参考：《同济大学学报(自然科学版)》2017年07期

【摘要】：结合南京地铁3号线大直径盾构隧道工程,对隧道管片钢筋应变进行了现场测试,基于既有的管片内力反算方法,考虑混凝土非线性性质及管片接头,提出了适用于深埋高水压盾构隧道的内力改进算法,并对改进算法反算内力与结构设计计算内力进行了对比分析.结果表明:改进算法更能反映管片的实际受力状态,更适用于荷载模式复杂且接头传力机制多变的大断面深埋高水压盾构隧道;采用设计方法计算的深埋高水压盾构隧道管片及接头内力与改进算法反算内力的分布规律基本一致,但在量值上具有一定的差异;采用设计方法计算的管片及接头轴力为改进算法反算轴力的1/2左右,反算的管片弯矩在拱底位置与惯用法计算弯矩接近,在拱腰及拱顶位置与梁-弹簧法更为接近,反算的接头弯矩大于梁-弹簧模型计算接头弯矩.研究成果可为大直径深埋盾构隧道设计提供参考.
[Abstract]:Combined with the large diameter shield tunneling project of Nanjing Metro Line 3, the strain of steel bar in tunnel segment is tested on the spot. Based on the existing inverse calculation method of internal force of segment, the nonlinear properties of concrete and segment joint are considered. An improved internal force algorithm for deep buried high pressure shield tunneling is proposed and the inverse calculation of internal force and the calculation of internal force in structural design are compared and analyzed. The results show that the improved algorithm can better reflect the actual stress state of the segment, and is more suitable for the large-section deep-buried high-pressure shield tunnel with complicated load mode and variable joint force transfer mechanism. The internal forces of the deep buried and high pressure shield tunnel segments and joints calculated by the design method are basically consistent with the distribution of the internal forces calculated by the improved inverse calculation method, but there are some differences in the values. The axial forces of the segments and joints calculated by the design method are about 1 / 2 of the back calculated axial forces of the improved algorithm. The bending moment of the back calculated segments is close to the moment calculated by the customary method at the bottom of the arch, and closer to the beam-spring method in the position of the arch waist and the arch top. The back-calculated joint moment is larger than the beam-spring model. The research results can provide a reference for the design of large diameter deep buried shield tunnel.
【作者单位】：同济大学道路与交通工程教育部重点实验室;上海市城市建设设计研究总院(集团)有限公司;西南石油大学地球科学与技术学院;
【基金】：国家自然科学基金(51478353)
【分类号】：U455.43

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