| The goal of the cavity decoupling explosion research is to use the cavity with different shape and criterion to achieve the energy decrement of surrounding media by the detonation coupling, to reduce the near-zone movement parameter value and far-zone seismic signal peak, protecting the engineering structure and the detonation not surveying by other people.Based on multi-disciplinary theories and methods such as the elasticity theory, the mechanics of plasticity, the explosion mechanics and so on, and by using the utilization impact wave-theory in this article, the aim is to explore and research the theory and method of cavity decoupling, analyze decoupling characteristic under different ambient condition, the influence caused by detonation on rock&soil and by rock&soil on detonation, as well as the coupling relations between them, providing certain technology, method and parameter for the experimental location and construction.Looking from the angle of the cavity decoupling, the effect of big cavity decoupling is better than that of the small cavity, the hard rock better than the soft rock; but looking from the geological decoupling situation, the effect of soft rock decoupling is better than that of the hard rock, and the salty crag medium has manifested the super-elasticity material characteristic. In the loess, it decays quickly, the shock wave spread in a not wide scope, the earthquake wave characteristic appears quickly in the far zone, and the capping mass, the salty crag and the granite present obvious dissemination characteristic of elastic stress. In the near zone, as a result of the coupling function of medium and shock-wave, the nature of the material and its construction changes, and it appears the characteristic of the plasticity, the elastoplasticity and the viscoelasticity, the stress wave speed bigger than the shock-wave speed, but smaller than the earthquake wave speed.Different load characteristics created by the detonation on rock&soil reflect that the sensitivity against the detonation power response by the rock&soil. The order of the contribution of frequency on the action in the loess, the capping mass, the salty crag and the granite is from small to big, mainly concentrates in the low frequency signaling zone, the frequency range of the loess and the granite is wide, in which that of the granite is the widest; the frequency range of the capping mass and the salty crag is narrow, and the high-frequency component of the stress wave of the loess the capping mass and the salty crag will be filtered quickly. The plastic failure's scope of the granite is smaller than that of the loess and the capping mass with an anomalous plastic failure area and the rock mass produces the massive crevasses; simultaneously the destructiveness must be small 1, and its equivalent stress value must be 1 magnitude smaller than the loess and the capping mass. |
