Blasting Process Analysis In Slope Project

Blasting is the most important manner breaking rock in the rock slope-excavated project. Blasting of slope is the course in which the situation of stress is extremely complicated and the course of destroy is very transient. Because of the complexity of rock slope characteristics,the variable condition of blasting and the limitation of measurement,people lack of enough understanding to slope's blasting and excavation. At the same time,blasting in the slope's excavation has great influence on the stability of slope. So it has great theoretical and realistic meaning to study blasting in the slope's excavation.As one part of the research program of study on reliability of stability of high rock slope and optimization of support,the thesis does further study on blasting and achieves some results as follows:(1) The interaction of shock wave and explosive gas due to blasting is the important cause to the destroy of the rock. The rock in the line of every hole is easiest to be destroyed while single-row blasting. Dynamic loads of blasting can be simplified to triangular loads.(2) According to the analysis to the single-hole model of blasting,the displacement of the nodes near blasting holes is large but decay rapidly. And this far away from blasting holes is relatively small,decay relatively slowly. After having rising rapidly,the speed of the nodes near blasting holes decays at once. While the nodes far away from the holes express the great damping vibration properties.(3) According to the analysis to the multi-hole model of blasting,the speed of expansion of plastic zone has nothing to do with the quantity of loading basically,and determined by the material physical property of the rock.(4) Earthquake wave by blasting has a great influence on stability of slope. Optimizing blasting parameters,controlling the quantity of dynamite and some other synthetical measurements can reduce the shakiness of blasting and ensure the stability of slope.