首页|TBM豆砾石回填灌浆层性能与密实度对支护效果的影响

TBM豆砾石回填灌浆层性能与密实度对支护效果的影响

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  • 国家科技期刊平台
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双护盾TBM采用预制管片、回填豆砾石和灌浆的方式进行支护施工,豆砾石回填灌浆层的性能和密实度是影响TBM隧洞工作性能的重要指标.以西北某双护盾TBM施工的引水隧洞为工程依托,基于室内试验研究了不同部位豆砾石回填灌浆层的力学性能,并通过数值模拟分析了豆砾石回填灌浆层性能与密实度对支护效果的影响.结果表明:受灌浆密实度不均匀的影响,豆砾石灌浆体的弹性模量和单轴抗压强度存在较大差异;在衬砌与豆砾石不存在脱空状态的条件下,豆砾石回填灌浆层参数取值不同对衬砌受力分布规律影响不大,但衬砌各个部位的应力有所变化;衬砌与豆砾石脱空部位受力状态与不脱空时存在显著差异,在脱空部位管片出现了较为明显的受力情况,部分区域应力超过衬砌混凝土的抗拉强度设计值,衬砌混凝土可能出现裂缝.在隧洞施工中应重点关注衬砌与豆砾石之间结合是否紧密,加强豆砾石回填、灌浆的质量监督.
Influence of Backfill Grouting Property and Compactness of TBM Pea-Gravel on Supporting Effect
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 property and compact-ness of pea-gravel backfill grouting is an important index affecting the working performance of TBM tunnel.On the basis of a diversion tunnel constructed by the double shield TBM,the performance of pea-gravel backfill grouting in different parts was studied through laboratory tests.The effects of the performance and compactness of backfilled pea-gravel on the support effect were analyzed by means of numerical simulation.The results show that there are great differences in the elastic modulus and uniaxial compressive strength of pea gravel due to the uneven den-sity of grouting.When there is no void between the lining and the pea-gravel,the different parameters of the pea-gravel have little effect on the stress distribution of segments,but the stress in various parts of the lining varies.The stress state of the hollow part of the lining and pea-gravel is different from that with no void.There is a relatively obvious stress condition in the hollow part of the segment,and the stress value exceeds the design value of concrete tensile strength.In tunnel construction,we should pay attention to whether the lining is closely combined with the pea-gravel and strengthen the quality supervision of pea-gravel backfilling and grouting.

double-shield TBMtunnel constructionpea-gravel backfill groutingsegment liningproperty and compactnesssupport effect

杨风威、金俊超、杨凡杰

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黄河勘测规划设计研究院有限公司,河南 郑州 450003

水利部黄河流域水治理与水安全重点实验室(筹),河南 郑州 450003

中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071

双护盾TBM 隧洞施工 豆砾石回填灌浆 管片衬砌 灌浆层密实度 支护效果

国家自然科学基金资助项目水利部重大科技项目中国博士后科学基金资助项目河南省重点研发与推广专项

52179113SKR-20220292022M721299232102320339

2024

10.3969/j.issn.1000-1379.2024.01.024

人民黄河
水利部黄河水利委员会

人民黄河

CSTPCD北大核心
影响因子：0.494
ISSN：1000-1379
年,卷(期)：2024.46(1)
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