摘要
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。
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.
作者
杨风威
金俊超
杨凡杰
YANG Fengwei;JIN Junchao;YANG Fanjie(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;Key Laboratory of Water Management and Water Security for Yellow River Basin,Ministry of Water Resources(Under Construction),Zhengzhou 450003,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《人民黄河》
CAS
北大核心
2024年第1期139-145,共7页
Yellow River
基金
国家自然科学基金资助项目(52179113)
水利部重大科技项目(SKR-2022029)
中国博士后科学基金资助项目(2022M721299)
河南省重点研发与推广专项(232102320339)。
关键词
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
double-shield TBM
tunnel construction
pea-gravel backfill grouting
segment lining
property and compactness
support effect
作者简介
杨风威(1985-),男,山东菏泽人,高级工程师,博士,主要从事水利水电工程勘察设计与研究工作,E-mail:yangfw@yrec.cn。
