Research On The Experimental Platform Of Cutter System Of Full Face Rock Tunnel Boring Machine And Analysis Its Adaptation To The Rocks

Underground engineering is the most important part of the foundation construction,which has a very important influence on the development of a country's economy.Full face rock tunnel boring machine is the key construction equipment for underground engineering.The quality and efficiency of projects intensively depend on its performance and working reliability.The cutter tool system is a key component of tunnel boring machine,which is mainly composed of the disc cutter and cutter head.As the executing part of the cutter tool system,the disc cutter receives two forces exerted from cutter head and rock.The cutter head also receives two forces from the disc cutter and propulsion system.Therefore,the cutter tool system constituted by disc cutter and cutter head is one of the key technologies of full face rock tunnel boring machine.Full face rock tunnel boring machine is a large,complete set of expensive,high-end equipment.Experimental and simulated research is an important means to overcome the key technology of cutter tool system.Based on the engineering application as the background,and referencing mass literature materials and practice materials,this paper develops a double cutter hard rock tunneling experiments,designs its structure,control,measurement and hydraulic systems.The mechanical and vibration model of rock breaking by disc cutter are established.The cutter rock breaking mechanism,process of rock breaking and the vibration characteristics are analyzed.The force of disc cutter and its adaptability to the rocks are demonstrated by the tunneling experiments.The mechanical and vibration model of cutter head are established.The force and vibration of cutter head,and assign of disc cutters are simulation and experimental investigation.The research contents are as follows:(1)Against the background of technical application and to obtain a high precision and high reliability data for target,rock hob test bed with double disc cutters is developed with a company.The projects of structural system,hydraulic system,control system and test system are designed.Stress and strain distributions in the framework,workbench and hob head are analyzed based on finite element technique.Modal analysis is also used in the rock hob test bed.The structures of its main frame,workbench and hob head are also designed.So,it provide the basis for the experimental research of adaptability between cutter tools and rocks.(2)Hydraulic drive systems of rock hob test bed with double disc cutters are designed.The simulation analysis methods for two hydraulic systems of workbench and cutter tool are got and its adjustment is done.The intelligence control platform of double disc cutters system consisted by experimental analysis module,control strategy analysis module,simulation results analysis module and performance parameter detection module is developed.Intelligent control methodology forecasted by fuzzy neural network is introduced to the control system.The interference-killing feature of the rock hob test bed is enhanced.So,it has a favorable dynamic behavior and static accuracy.(3)According to the mechanism and process of rock breaking by disc cutters,the mechanical model and model of modal analysis of single disc cutter are built.The distribution law of stress,strain and vibration are analyzed at the process of breaking rocks by single disc cutter.The distribution of internal stress is also obtained.The effects on internal stress of rocks from the parameter of pressure and cutting depth are analyzed.The adaptability of single disc cutter on various rocks is analyzed repeatedly.The vibration characteristic and breaking situation of disc cutters are carried out by rock hob test bed with double disc cutters with experiment means.Influencing rules on the life of cutters from vibration resistance are obtained.The critical penetrations of different rocks are gained at the process of cutting rocks.And this critical penetration is the critical value of the penetration of a rock.(4)According to the structure and working principle of the cutter head,the distribution of stress and strain,and vibration characteristics are simulated.The effects on stress and vibration of the cutter head from structure and working parameter are analyzed.Rock-breaking mechanics mode of double disc cutters is built.The effects on force of double disc cutters and rocks breaking productivity are analyzed by the location of double disc cutters,rock properties and working parameters.The effects on efficiency and area of rock breaking from feature of different rocks and cutter spacing are researched by the experimental platform.The results show that the cutter spacing exist an optimal value at the process of rock breaking.If the cutter spacing is an optimal value,the areas of rock breaking are connected and the crushing efficiency of the rocks is greatest.(5)The coupling effects among critical penetration,cutter spacing and properties of rocks are set up by simulation and experiment.The effects on rock fragmentation by cutter space,rolling speed and penetration are analyzed.The relation between cutter spacing and rock breaking efficiency is also analyzed.The research shows that the actual work performance of disc cutters and cutter head could be researched the rock hob test bed with double disc cutters.The high accuracy and credible data could be acquired.And important means of testing and validation are provided for theoretical investigation by this integration of comprehensive experimental platform.