Dynamic Response Of Floor Of Mine Auxiliary Transportation Roadway Under Influence Of Environmental Factors And Driving Loads

More than 90%of China’s coal resources are mined by means of well drilling.In mines of different regions and depths,the physical properties of rock masses in the floor of the roadway vary greatly,and the environment in which the roadways are located also varies greatly.When the auxiliary transportation equipment runs for a long time,the dynamic response characteristics of different roadway floors are also different.With the development of mining deeper and the increase of the mine rail transportation volume,the impact of the underground environment and the driving load on the auxiliary transportation of the roadway will be greater and greater.In order to maintain the stable operation of the roadway floor,it is necessary to systematically study the dynamic response characteristics of roadway floor under the combined action of environmental factors and driving load.Based on the saturated porous media theory in the field of geotechnical engineering,different models of roadway floor under driving load are established for analysis according to different environmental factors.Firstly,based on Biot’s theory,a saturated porous medium model considering fluid-solid coupling is established to simulate the roadway floor according to the different mechanical properties of different roadway floor rock masses.Rock materials with different mechanical properties such as different elastic modulus,porosity and permeability are selected to analyze the differences in the dynamic response of roadway floor.The results show that the dynamic responses of different elastic modulus,porosity and permeability coefficient to the displacement of roadway floor and pore water pressure are significantly different.Secondly,in view of the complex temperature environment underground,based on the existing thermal-fluid-solid coupling theory,a thermal-fluid-solid coupling model of saturated porous media considering temperature effect is established.The influence of load and temperature difference between rock mass and surface of roadway floor on the dynamic response of roadway floor is analyzed.It is found that the temperature difference change will have a significant impact on the dynamic response of roadway floor.Finally,aiming at the problem of track auxiliary transportation in soft rock roadway.According to the mine track auxiliary transportation system,an auxiliary transportation vehicle-track coupling system is established to analyze the vibration characteristics of the vehicle and track system.Then,the force of the under-rail structure on the roadway floor is used as an excitation to act on the surface of the roadway floor,and the dynamic response characteristics of the soft rock roadway under different driving conditions are analyzed.It can be found that the driving load has a significant impact on the soft rock roadway floor under different driving conditions.The above analysis lays a foundation for understanding the dynamic response characteristics of roadway floor under different environmental factors and the essence of vibration phenomenon of mine track transportation,and provides theoretical basis for solving practical problems of complex engineering in the future.