Structure Design And Research Of Loading Device For Simulating Deep Rock

As China's infrastructure projects and the vigorous development of natural resources development,there have been a large number of deep roadway and tunnel.Simulation and research of the phenomenon in the deep roadway and tunnel development can provide scientific guidance for safe construction.The deep rock loading device studied in this paper is the main part of the loading system in the physical simulation experiment system of dynamic disaster.The aim is to provide the initial stress field of the deep rock in the laboratory environment for the rock model.In this paper,the status quo of loading devices at home and abroad and the application of loading devices in physical simulation test systems are summarized.Based on the analysis of the stress state of the deep rock,the function requirement of the loading device is put forward.Then the overall design scheme of the loading device is put forward combining with the project requirements.It is determined that the body of the loading device adopts the frame structure,the loading mechanism adopts the row cylinder to carry out the uniform load application,and the pretensioning mechanism adopts the rod-nut preload and so on,and completes the detailed design of the loading device.The principle of the transmission mechanism,and the preload factor of the board are analyzed.The calculation of the track wheel and pulley in the feeding mechanism is carried out.The hydraulic cylinder cylinder,piston rod,Piston,rod and other structures were calculated.Secondly,importing the simplified loading device model to ANSYS workbench established by CROE.After that,defines the type of loading device of unit,grid,material,contact relationship.Then,adds loads and constraints into loading device.Through the study of static finite element simulation,the preloaded coefficient was verified reasonably in the pre-tightening mechanism;the correctness of the structural design including the overall framework of the loading device and the main parts such as frame,board,gate are verified.It can complete this subject that loading 3200 t static load in three directions of rock model.Through the static simulation of the gate,proved that deformation of the gate will not have lateral extrusion on the bottom rail.Then it can provide the corresponding data for the subsequent dynamic analysis.Then,using the transient analysis theory to analysis the modal of loading device,through what can get the device's every vibration mode and frequency to provide the impact cylinder's frequency can't resonance with the device.Through the impact analysis of the loading device,the relationship between the deflection and the impulse and thickness is obtained;The fatigue characteristics of the device under cyclic impact loads is also obtained.Through the Impact simulation of the board,the deformation and equivalent stress under the impact of the impact of the cycle is obtained.comparing the impact simulation analysis and the statics analysis result of the vertical slab,the influence of the impact load on the frame is too small compared with the static load.Finally,the hydraulic control system of the loading device is designed,including the independent hydraulic cylinder servo control system and the double cylinder master-slave synchronous hydraulic control system.For the independent hydraulic system,the systemic components were selected by calculation.For the independent hydraulic system,the systemic components were selected by calculation,and the system was modeled by AMESim,simulated and analyzed under low-voltage no-load and high-pressure loading.For the synchronous control system,the transfer function is analyzed and the control system block diagram is established.Finally,the synchronization simulation of the control system is carried out by MATLAB software.It shows the correctness and feasibility of hydraulic system design.