Analysis Of The Stability Of Deep Slab Structure Based On The Structure Resonance Induced By The Blasting Vibration And Its Application

Along with the excavation of roadways and cavities under high stress, its surrounding rock often appears with buckling failure which is basicly parallel with the excavation face. When the buried depth is very large or the in-situ stress is very high and the item is under blasting disturbance at the same time, buckling failure occurs much easier at the free face, whose external performance includes floor heave, rib spalling, roof fall and even rock-burst. Therefore, this paper will systematic study on the stability of deep slab structure based on the structure resonance induced by the blasting vibration by means of field monitoring, laboratory test, theoretical research, numerical simulation and engineering application.First of all, theoretical derivation on the falure of slab structure is performed.By simplifying, the beam subjected to axial compression is used to represent the slab structure under high stress. Deformation curve for a given beam model and the Euler’s formula are derived based on the mechanics of materials and structural mechanics. By solving the differential equations of motion, methods to calculate the natural frequency and main vibration mode are derived in the dynamic response analysis of structures.Second, blasting vibration load is analyzed. Via on-site collection of a large number of original data, analysis of the seismic wave spectrum and the fitting of Sadaofusiji formula, the change laws of frequency distribution of earthquakes and particle velocity variation have been derived. Meanwhile, an artificial synthesis of blasting seismic wave of visualization software is prepared for the next study on Mathematica platforms.Then exploiting orthogonal experiment, the author designed a three-factor-five-level numerical test of influence on fracture structure, where the intensity, frequency and duration of blasting seismic wave is taken into account.Finally, this paper introduces the engineering background of the research and briefly illustrates the numerical acquisition method and experimental method of the parameters in the model. Model of mine roadway under the action of blasting vibration and high ground-stress is established to do the analysis of structure dynamic response through Abaqus.At the same time, in the aspects of design, controlled blasting and execution, some engineering suggestions are given.