摘要
全断面隧道掘进机(简称TBM)在穿越深部软弱地层时围岩收敛变形较大,围岩容易挤压护盾,导致TBM卡机,影响TBM正常掘进。通过分析TBM卡机灾害孕育过程,得到了预测TBM卡机的重要条件:一是围岩变形量大于预留的空间,二是额定推力不能克服摩擦阻力。为了监测实际工程TBM卡机状态,提出了一种监测护盾变形的方案以及护盾受力的计算方法,可通过监测得到的变形估算护盾的受力,进而计算出护盾受到的摩擦阻力,得到TBM卡机的状态。根据TBM受到的摩擦阻力、TBM正常掘进时所需推力和TBM额定推力之间的关系,将TBM卡机状态分为4个等级,即无卡机、轻微卡机、卡机和严重卡机,并提出了对应的处理措施。结合TBM卡机条件以及护盾受力监测方案,提出了TBM卡机灾害预警流程。在兰州水源地输水隧洞工程中应用了该监测方案和卡机灾害预警流程,应用结果表明,预测的卡机状态与TBM实际状态基本一致,说明该方法具有一定的可靠性,对指导TBM隧道施工具有重要意义。
The deformation of surrounding rock tunnelling by tunnel boring machine（TBM） is normally large when the tunnel passes through the deep and weak layer. The TBM shield is squeezed easily by the surrounding rock, which further results in the TBM jamming and influences the operation of TBM. By analyzing the mechanism of TBM shield jamming problems, two important conditions for forecasting TBM jamming are concluded. One is that the deformation of the surrounding rock is greater than the reserved space, and the other is that the rated thrust force cannot overcome the frictional resistance. For monitoring the jamming state of the actual TBM engineering, this study is to propose a scheme of monitoring the deformation of the TBM shield and a method of calculating the pressure of the shield. The extrusion force between the surrounding rock and the shield can be estimated, then the frictional resistance of TBM is calculated, and the state of the TBM jamming can be achieved. According to the relation between TBM frictional resistance force for excavating and the TBM rated thrust, the state of the TBM jamming can be divided into four grades： no jamming, minor jamming, jamming and severe jamming, and the corresponding treatment measures are suggested. At last, the flowchart of warning of the TBM jamming is developed by combining the monitoring scheme with the conditions of TBM jamming. The flowchart and the scheme of monitoring the deformation are successfully applied to Lanzhou water conveyance tunnel engineering, and it is found that the predicted jamming state is nearly the same as the actual state, and thus this method has certain reliability and attaches great importance to TBM tunnelling construction.
作者
刘泉声
彭星新
黄兴
雷广峰
魏莱
刘鹤
LIU Quan-sheng;PENG Xing-xin;HUANG Xing;LEI Guang-feng;WEI Lai;LIU He(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;School of Civil Engineering and Architecture,Wuhan University,Wuhan,Hubei 430072,China;Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province,Wuhan University,Wuhan,Hubei 430072,China;University of Chinese Academy of Science,Beijing 100049,China;China Railway 11th Bureau Group 4th Engineering Co.,Ltd.,Wuhan,Hubei 430073,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2018年第9期3406-3414,共9页
Rock and Soil Mechanics
基金
国家重点基础研究发展计划项目(973计划)(No.2015CB058102
No.2014CB046904)
国家自然科学基金面上项目(No.51474205)
supported by the National Program on Key Basic Resaerch Project of China(973 Program)(2015CB058102
2014CB046904)
the General Program of National Natural Science Foundation of China(51474205)
关键词
全断面岩石隧道掘进机
护盾受力
卡机预警
tunnel boring machine （TBM）
shield stress
warning mechanism of the TBM jamming
