Dynamic Response Of Blasting Vibration To Upper Algorithm Of Uppered And Upper Mining

The roof of mined area is relatively weak, and the goaf roof is one of the most serious accidents in underground metal mines. The underground workers not only pose a threat to the safety, but also have a significant impact on the production and management of underground pressure. There are many factors affecting the goaf roof stability. The stress distribution and the blasting vibration are the two most important factors. This paper mainly uses the method of theoretical analysis combined with numerical simulation, from static and dynamic two aspects of goaf roof stability of the stress in the weight and load of blasting under dynamic loads are analyzed and studied. The main contents of the thesis are the following:(1) On the basis of previous research on roof stability analysis of gob caving method based on Caving mechanism and influencing factors and blasting earthquake Harm of wave and the characteristics of the gob roof caused;(2) Using the theory of elastic thin plate in the roof, the goaf is simplified into a thin elastic plate on the roof under uniform deflection under static load and simply supported boundary conditions and stress analysis for calculation and stress analysis, using Matlab software to draw the roof surface deflection and tensile diagram, and analyzes the influence of span, thickness and overburden loads on roof deflection and internal force;(3) Using the elastic vibration theory of thin plate down the top plate under uniform harmonic pulse displacement under load, and the calculation formulas for stress analysis. The damping, dynamic load strength, influence of dynamic frequency response of roof strata, and the dynamic response in the empty mining district under dynamic and static loads of roof are analyzed.(4) The application of FLAC3D simulation software to establish goaf simplified model, respectively. In view of the gob roof in the weight should be loads and at different frequency and different amplitude of seismic wave load under the action of stress field, displacement field and plastic zone changes were simulation analysis and the numerical simulation results and the theoretical calculation results were compared and analyzed.