TBM 豆砾石回填灌浆密实度对支护效果的影响研究

doi:10.3973/j.issn.2096-4498.2020.03.004

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Scopus RCCSE中国核心学术期刊
美国EBSCO数据库俄罗斯《文摘杂志》
《日本科学技术振兴机构数据库（中国）》

隧道建设（中英文） ›› 2020, Vol. 40 ›› Issue (3): 326-336.DOI: 10.3973/j.issn.2096-4498.2020.03.004

TBM 豆砾石回填灌浆密实度对支护效果的影响研究

王明友¹, 侯少康², 刘耀儒^2,∗, 金　峰²

(1. 华能西藏雅鲁藏布江水电开发投资有限公司, 四川成都　610200; 2. 清华大学水沙科学与水利水电工程国家重点实验室, 北京　100084)

收稿日期:2019-04-27 出版日期:2020-03-20 发布日期:2020-04-09
作者简介:王明友(1972—),男,四川宜宾人,1998 年毕业于河海大学,水利水电工程专业,硕士,高级工程师,现从事水利水电工程建设技术管理工作。 E-mail: wangmy@ hntibet. com。 ?通信作者: 刘耀儒, E-mail: liuyaoru@ tsinghua. edu. cn。
基金资助:
水沙科学与水利水电工程国家重点实验室资助项目(2019-KY-03)

Influence of Backfill Grouting Compactness of TBM Pea-gravel on Supporting Effect

WANG Mingyou¹, HOU Shaokang², LIU Yaoru^{2, ∗}, JIN Feng²

(1. Huaneng Tibet Brahmaputra Hydropower Development Investment Co., Ltd., Chengdu 610200, Sichuan, China; 2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China)

Received:2019-04-27 Online:2020-03-20 Published:2020-04-09

摘要/Abstract

摘要：

双护盾TBM(tunnel boring machine)采用预制管片、回填豆砾石和灌浆的方式进行施工,使管片、回填层与围岩形成整体的支护结构。豆砾石回填灌浆的密实度是影响TBM 隧洞工作性能的重要指标,但实际工程中回填灌浆的密实度往往较低。为了研究不同回填密实度对围岩变形、屈服状态及衬砌受力等的影响,基于多雄拉隧洞掘进的数值仿真,提出一种随机单元模型,用于模拟不同的回填灌浆密实度,对豆砾石回填灌浆的密实度与围岩、管片支护结构的力学状态的关系进行分析,并根据对围岩变形的影响将回填灌浆密实度划分为A~E 5 个等级,同时给出相应的回填灌浆密实度建议。此外,对顶部和侧部局部不密实对支护效果造成的影响进行模拟和分析。通过分析可知: 回填灌浆密实度过低,会导致管片应力分布不均匀且产生较大拉应力,也会产生较大的围岩变形和屈服区分布; 对于Ⅲ类围岩及以上围岩,建议回填密实度在70%以上,对于比Ⅲ类围岩质量差的围岩,建议回填密实度在80%以上。另外,通过计算可知顶部回填不密实的风险大于侧部,且当回填不密实比例为1/6 时应力分布最不均匀。研究成果可为类似工程提供密实度评价及为补灌处理提供借鉴。

关键词: 双护盾TBM, 隧洞施工, 豆砾石回填灌浆, 密实度, 支护效果, 随机单元模型

Abstract:

The precast lining segments, pea-gravel backfilling and grouting are adopted in the double-shield TBM (tunnel boring machine) construction. which makes the segments, backfill layer and surrounding rock form an integral supporting structure. The compactness of pea-gravel backfill grouting is an important index affecting the working performance of TBM tunnel. However, the backfill grouting compactness is often low in practical projects. In order to study the influence of different backfill compactness on surrounding rock deformation, yield state and the stress of lining segment, a stochastic element model is proposed to simulate the different backfill grouting compactness based on the numerical simulation of Duoxiongla Tunnel. The relationship between the backfill grouting compactness and the mechanical state of support structure is analyzed. According to the influence of compactness on the surrounding rock deformation, the backfill grouting compactness is divided into five grades from A to E. Meanwhile, the suggestions on the backfill grouting compactness are given. In addition, the influence of local non-compactness at top and side of tunnel on supporting effect is simulated and analyzed. The analytical results show that: (1) The low compactness of backfill layer will lead to uneven stress distribution and large tensile stress of lining segment, as well as cause large deformation and yield area distribution of surrounding rock. (2) For Grade Ⅲ surrounding rock, the recommended compactness is over 70%, and for the surrounding rock with poor quality than Grade Ⅲ, the recommended compactness is over 80%. Additionally, the risk of the uncompacted backfill at the top of tunnel is greater than that at the side, and the stress distribution is the most uneven when the proportion of uncompacted backfill is 1/6. The results can provide reference for the backfill grouting compactness evaluation and the supplementary grouting treatment of similar projects in the future.

Key words: double-shield TBM, tunnel construction, pea-gravel backfill grouting, compactness, support effect

中图分类号:

U 45

王明友, 侯少康, 刘耀儒, 金峰. TBM 豆砾石回填灌浆密实度对支护效果的影响研究[J]. 隧道建设, 2020, 40(3): 326-336.

WANG Mingyou, HOU Shaokang, LIU Yaoru, JIN Feng. Influence of Backfill Grouting Compactness of TBM Pea-gravel on Supporting Effect[J]. Tunnel Construction, 2020, 40(3): 326-336.

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TBM 豆砾石回填灌浆密实度对支护效果的影响研究

Influence of Backfill Grouting Compactness of TBM Pea-gravel on Supporting Effect

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