影响双护盾TBM掘进效率的地质因素及对策研究
Study on geological factors affecting double shield TBM tunneling efficiency and countermeasures
杨继华 1魏建鹏 1王志强 1杨风威 1齐三红1
作者信息
- 1. 黄河勘测规划设计研究院有限公司,河南 郑州 450003
- 折叠
摘要
针对地质因素影响TBM掘进效率的问题,以兰州市水源地建设工程输水隧洞双护盾TBM施工为背景,采用现场调查、数据统计的方法,分析了岩石单轴抗压强度、岩体完整性、岩石石英含量、地应力、地下水等对TBM施工的影响,并针对各种地质因素提出了TBM施工对策.结果表明:① 当岩石单轴抗压强度Rc在50～80 MPa时,TBM施工速度最高,日进尺可达30m以上;当Rc低于50 MPa时,施工速度随强度的降低而降低;当Rc大于80 MPa时,TBM施工速度随Rc的增加而降低.② 当岩体完整性系数Kv在0.40～0.60 时,施工速度最高;当Kv大于0.60 时,施工速度随着Kv的增加而降低;当Kv小于0.4 时,施工速度随着Kv的降低而降低.③ 岩石的石英含量越低,地应力水平越低,地下水越少,对TBM施工越为有利.研究结果可为类似工程的TBM地质适宜性评价及施工方法提供参考.
Abstract
Taking the construction of Lanzhou Water Source Project as a background,which uses double shield TBM for tunne-ling,we analyze the effects of geological factors on TBM tunneling efficiency through on-site investigation and data statistics and propose countermeasures for each geological factor.The geological factors include uniaxial compressive strength of rock,rock mass integrity,quartz content of rock,ground stress,and groundwater.The results show that when the uniaxial compressive strength(Rc)of rock is between 50～80 MPa,the TBM advancing rate(AR)reaches over 30 m in a day.When Rc is below 50 MPa,AR decreases with decreasing strength.When Rc is above 80 MPa,TBM tunneling speed decreases with increasing Rc.When the rock mass integrity coefficient(Kv)is between 0.40～0.60,AR reaches the highest.When Kv is greater than 0.60,AR decreases with increasing Kv,and when Kv is less than 0.4,AR decreases with decreasing Kv.The lower the quartz content of the rock,the lower the ground stress level,and the less groundwater,the more favorable it is for TBM tunneling.The research results can provide ref-erence for TBM geological suitability evaluation and construction methods for similar projects.
关键词
输水隧洞/双护盾TBM/施工效率/地质因素/兰州市水源地建设工程Key words
water conveyance tunnel/double shield TBM/construction efficiency/geological factor/Lanzhou Water Source Project引用本文复制引用
基金项目
黄河勘测规划设计研究院有限公司自主研究开发项目(2020-ky04)
黄河勘测规划设计研究院有限公司自主研究开发项目(2022-ky03)
黄河勘测规划设计研究院有限公司自主研究开发项目(2023-ky14)
出版年
2024
国家科技期刊平台
NSTL
万方数据