Analysis Method On Cutting Force Real-time Monitoring And Field Application In TBM Excavation

Real-time monitoring of the cutting force condition not only helps the TBM to tunnel safely and efficiently,but also helps to save costs during the TBM construction process.However,due to the harsh construction environment and restriction of the surroundings on site and the ambiguity of the monitoring methods,real-time monitoring of the cutting force is difficult to achieve.In this paper,Dali Railway Tunnel in Gaoligong mountain is taken as the support project and the 19-inch TBM hob produced by China railway engineering equipment group co.ltd is taken as the research object,the real-time monitoring method of cutting force is studied,the real-time monitoring system is established,and On-site application was carried out on the’Cai Yun’ TBM.The specific research content can be divided into the following aspects:First,combined with the research on the cutting force and its on-site monitoring at home and abroad,it is considered that it is very feasible to use the C-shaped block as the monitoring object and indirectly solve the force of the hob by the dynamic correlation theory.At the same time,based on the dynamic theory of real-time monitoring method for cutting force,the multi-degree-of-freedom dynamics model of the hob is established and perfected.The multi-degree-of-freedom vibration differential equation is established by the lumped mass method and Newton’s second law.Dynamic parameters(such as mass matrix,stiffness matrix,damping matrix,etc.)are solved by simulation,mechanical mechanics,dynamics and other related k Nowledge.Then the external load of the hob is identified by Wilson-θ inverse analysis method,and its feasibility and effectiveness are analyzed.Under the condition of linear cutting Machine test,the normal force,side force and rolling force error levels in the case of no noise are respectively 0.45%,0.05% and 0.84%,and the normal force,side force and rolling force in the case of 10% noise error levels are respectively 1.23%,1.52% and 1.76%.Under the condition of rotary rock-breaking test,when the cutting radius of the hob is 570 mm and the penetration degree is 5 mm,the normal force and side force error levels are 1.57% and 4.24%,when the cutting radius of the hob is 570 mm and the the penetration degree is 7 mm,The normal force and lateral force error levels are 1.53% and 3.16%.Finally,this paper introduces the process of installing the monitoring system in the Dari Railway tunnel of Gaoligong mountain.The calibration test of the C-type block is carried out on the RMT rock mechanics test machine.The on-site unattended monitoring program is written by Robo Task.The No.36 hob on the ’Cai Yun’ TBM was monitored in real-time,and the on-site monitoring data was obtained.BP neural network is used to analyze the data of the k Nown three-channel data to supplement the missing channel.It is proposed to identify the external load of the hob by Wilson-θ inverse analysis method and the real-time monitoring system is improved.