Study On Rock Breaking Force Of Disc Cutters Of Different Diameters

As an important mechanical equipment for tunnel excavation,the full-section rock boring machine has become the focus of research in all countries in the world.As the core component of the TBM,the rock-breaking force of the disc cutter directly affects the rock-breaking efficiency.Therefore,in-depth study of the rock-breaking force of disc cutter has very important application value and theoretical significance.In this paper,the size of the rock-breaking force of three different diameters of disc-shaped disc cutter of 17in,19in and 21 in under the same penetration degree and the magnitude of rock breaking force under different construction geology are studied and theoretically explored for the purpose of improving the utilization rate of disc-shaped hob and reducing loading.The main research contents and achievements are as follows:Firstly,the rock-breaking force of disc hobs was studied in depth,and the calculation formulas of lateral force,vertical force and circumferential force of disc-shaped hobs of different diameters were fitted-granite experimental materials were selected and experimental simulations were carried out by using the rock-breaking theory of the Colorado School of Mines.The interaction between the disc disc disc and the rock is modeled,and the influencing factors such as the diameter,penetration degree and installation radius of the disc disc are considered as important influencing parameters,which is closer to the real situation of the disc hob rock breaking than the simulation experiments designed by other scholars.Therefore,the data of the simulation experiment is more accurate and close to the actual situation.In addition,the calculation formulas for lateral force,vertical force and circumferential force of the disc cutter fitted in this paper are simpler and less computational.In addition,through experimental data,it is found that under the same installation radius and the same penetration,the vertical force and circumferential force of the 19in disc cutter are the largest.Therefore,the use of 19in disc cutters for construction should be avoided in actual engineering.Secondly,the load magnitude of the disc cutter with different diameters of 17in,19in and 21 in under the same penetration degree was deeply understood and studied,and it was found that the traditional experience was not accurate and had a great impact on the actual engineering construction.Therefore,ABAQUS software is used to simulate and analyze the force of three different diameters of disc cutter of 17in,19in and 21 in under the same penetration degree.The influence of disc cutter diameter,knife spacing and penetration degree was considered.It is concluded that the vertical force and circumferential force of the 19in disc cutter are the largest,the force of the 21 in disc cutter is the middle,and the force of the 17in disc cutter is the smallest.Finally,the rock properties are changed,and the three rock conditions of sandstone,limestone and marble are numerically simulated.The loading data of the disc cutter under 189 working conditions was obtained,and the changes of lateral force,vertical force and circumferential force were obtained under different rock conditions,installation radius and penetration degree of the disc cutter.In this paper,the experimental test data of 17in,19in and 21 in disc cutter under the same penetration degree and different rock conditions are simulated by ABAQUS finite element software,and the rockbreaking force calculation formula is fitted,which provides new ideas and theoretical basis for researchers of rock-breaking force of disc cutter.