The Influence Of Blasting Resource Factors On Distribution Character Of Blasting Seismic Intensity

Blasting seismic tremors can give rise to geological disaster, destroy the ecological environment, and disturb normal livelihood, while optimizing blasting parameters are an important measure to avoid harming the protected structure and to improve the distribution of blasting vibration intensity. With blasting environment situation getting increasingly complex and the requirement of blasting seismic effects controlling being more demanding, the corresponded theories on designing and construction, accordingly, have to be adjusted so as to be theoretically scientific, technologically operable and economically advantageous.The status quo of both the experimental and the theoretical studies on distribution characteristics of vibration intensity influenced by blasting resource factors is to be presented; then, a comparative analysis between the contribution characteristics of blasting vibration intensity caused by spherical charges and cylindrical charges by oneself, or between single charges and several charges by oneself is to be conducted, from which the limitation of the previous researches is presented, evaluated and forecasted. The existing investigations concerning experimental relationship between blasting resource factors based on experiment and distribution characters of vibration intensity lacks theoretical confirmation; in addition, blasting resource factors, which influence blasting seismic intensity, are not all-round. In views of it, it is necessary to make further researches on distribution character of vibration intensity influenced by blasting resource factors. The present study argues that to locate the protections in the comparatively weak seismic field yet still better control the blasting seismic effect, the blasting parameter is to be devised through controlling charges' quantity and regulating charges' shape and spatial state, as well as the spatial relation between spiral lattice form, the charges' number, the charges' lattice extension and the subordinate number.No matter how much explosive there is, the detonation pressure of any explosive is constant, because blasting vibration intensity are monotone functions about charges's quantity. According to the momentum conservation law, and the attenuation law of blasting vibration energy and its pressure with time and distance from explosion center, from the perspective of the radial propagation mechanical behavioral characteristic of the detonation impulse momentum from the explosive, the energy s' diffusion and loss of explosion wave and its pressure, the behavioral characters of the shock wave and detonation gases are studied, the result of which testifies in theory the function's monotone between blasting vibration intensity and the explosive quantity and the distance from blasting resource by the theory.Through adjusting charge's shape, charge' s relative spatial relations to change the direction distribution character and the gradient distribution character of blasting vibration velocity, the relation between blasting vibration intensity and charge shape , the charge' s relative spatial relations is examined on the basis of the wave mechanics and the theory to dump blasting seismic wave influenced by propagating medium' s sticky, complemented by numerical analysis, with the purpose of acquiring the result of the interrelation among charge shape, charge' s relative spatial relations and the distribution of blasting vibration velocity.Through adjusting blasting parameters such as the charges' spiral lattice form, the charges' number and the charges' lattice extension to change the distribution character of blasting vibration velocity, on the basis of the laws that energy flow of the blasting seismic wave attenuates in different sticky medium, that stress wave attenuates in rock medium under impact load, that the extent of the blasting seismic damage depends on the factors such as blasting vibration velocity, and that energy flow of the blasting seismic wave is monotone functions about blasting vibration velocity, the relation between blasting source factors and the distribution character of blasting vibration velocity is investigated; in addition, the predominant direction of wave energy's flow and the relation between blasting vibration velocity and the distance from blasting sources are approached. Then, the distribution rule of blasting vibration velocity is drawn, furthermore, the relation between distributions' predominate orientation of blasting vibration and the envelope in which explosive charges exist, is set up.Based on the exhausted energy theory about various hysteretic loops, that is, strain lags behind stress in stickup under impact load, it is proved that blasting vibration velocity reaches the convergent value with subordinate number rising. The mathematical formula of relations between the subordinate number and blasting vibration intensity is drawn frown the spectrum composed by subordinate blasting vibration velocity increasing with the subordinate number rising under both the equal subordinate conditions and the equal intervals by seismic wave' s superposition, in order to probe whether it corresponds to the reality that the blasting vibration velocity reaches the convergent value with subordinate number rising. The formula is analyzed by mathematical software, with the aim that the existence of the convergent character is confirmed, and how the delaying time influences the convergent subordinate number are drawn.