考虑回填层的护盾式TBM隧道结构设计方法研究

吴圣智; 姜志毅; 王明年; 刘大刚; 董宇苍

doi:10.11779/CJGE201805010

考虑回填层的护盾式TBM隧道结构设计方法研究 English Version

吴圣智^{1, 2},
姜志毅^{1, 2},
王明年^{1, 2},
刘大刚^1,2,,
董宇苍^{1, 2}

1. 西南交通大学土木工程学院,四川成都 610031;
2. 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

详细信息

作者简介:
吴圣智(1987- ),男,博士研究生,主要从事TBM设计及施工控制技术研究。E-mail：821437063@qq.com。

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出版历程
- 修回日期: 2017-02-28
- 发布日期: 2018-05-24

Design method for shield TBM tunnels considering backfill

WU Sheng-zhi^{1, 2},
JIANG Zhi-yi^{1, 2},
WANG Ming-nian^{1, 2},
LIU Da-gang^1,2,,
DONG Yu-cang^{1, 2}

1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 回填层作为管片与围岩之间的传力层对管片受力有着重要的影响,而现行护盾式TBM隧道设计方法均忽略了回填层的影响,与工程实际存在一定的差异。研究考虑了护盾式TBM隧道中回填层的实际分布,推导了回填层-围岩等效抗力系数计算公式,并以此建立了TBM隧道管片结构设计模型。研究得出：由于回填层的存在,围岩-回填层的等效抗力系数与围岩抗力系数存在一定的差别,围岩抗力系数的改变程度与围岩、回填层力学参数比有关;回填层在管片背后分布呈“上厚下薄”状,使得管片背后围岩-回填层弹性抗力系数分布不同,Ⅱ级围岩回填层-围岩弹性抗力系数呈“上小下大”的鸭蛋状,Ⅲ,Ⅳ级围岩近乎圆状,Ⅴ级围岩呈“上大下小”的倒鸭蛋状;基于回填层-围岩等效抗力系数的结构设计模型计算出的管片受力结果与现场试验值更加接近,验证了回填层-围岩等效抗力系数计算方法和设计模型的准确性。
- 管片 /
- 围岩 /
- 回填层 /
- 抗力系数 /
- 结构设计模型
Abstract: As the transmission layer between segments and surrounding rock, the backfill layer has important influence on the mechanical characteristics of segments. However, the current design method for shield TBM neglects the influence of the backfill layer, and has differences from the engineering practice. According to the actual distribution of backfill in shield TBM tunnel, the formula for calculating backfill layer and ground reaction coefficient is deduced, and the design model for segment structures is established. It is concluded that due to the existence of the backfill layer, the equivalent resistance coefficient of the surrounding rock and backfill layer is different from that of the surrounding rock. The change degree of the resistance coefficient is related to the mechanical parameters of the surrounding rock and the backfill. Because the backfill behind the segments is thick at upper part and thin at lower part, the distribution of resistance coefficient is different. The distribution of resistance coefficient in rock grade II is small at upper part and large at lower part like a duck egg. The resistance coefficient in rock is grade III and IV, close to be uniform. The resistance coefficient in rock grade V is large at upper part and small at lower part like an inverted duck egg. The calculated results of the segmental force based on the structural design model for backfill are closer to the field test values, and the proposed method for the equivalent resistance coefficient and the design model are verified.
- segment /
- surrounding rock /
- backfill layer /
- resistance coefficient /
- structural design model

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参考文献(16)

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