Solutions and Measures for TBM Extrication in Extremely Weak and Broken Water Rich Formation
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摘要: 某铁路隧道工程平导洞TBM在穿越软弱破碎富水地层时出现涌水溜坍，在地质探测和管棚施工过程中存在钻孔压力过大、泥浆裹钻、孔内喷涌等异常情况，盾尾左侧突发涌水并携带大量泥沙涌出，造成盾体及主梁区域围岩变形，TBM被困，风险极大。为应对现场出现的问题，使TBM快速脱困，采取了超前钻探、注浆加固、高位支洞泄水、安装双速减速机以及超前管棚支护和护盾周边扩挖的方法，最终实现了TBM的安全脱困。这些方法的联合使用，为极端软弱破碎富水地层TBM的施工与险情处理提供了可靠的借鉴方案。Abstract: When the horizontal pilot tunnel TBM of a railway tunnel project passes through the weak, broken and water rich stratum, it burst and collapsed. In the process of geological exploration and pipe shed construction, abnormal conditions occurred, such as excessive drilling pressure, mud wrapped drilling, water gushing in the hole and so on. Water poured suddenly and large amount of sediments gushed in the left side of shield tail, which caused the deformation of shield body and main beam area surrounding rock. TBM was trapped and had great risk. In order to deal with the problems and make TBM out of trouble quickly, the methods of advanced drilling, grouting reinforcement, high level adit drainage, installation of double speed reducer, advanced pipe shed support and shield surrounding excavation were adopted, and finally the TBM is out of trouble. The combined methods provides a reliable reference scheme for the construction and danger treatment of TBM in extremely weak and broken water rich strata.
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Key words:
- weak and broken /
- water rich strata /
- tunnel construction /
- TBM trapped
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