| Nowadays, long tunnel construction is becoming more and more obvious. In this context, how to improve the speed and efficiency of drilling-blasting method under ensure construction safety becomes more necessary. Based on the project of hongtiguan long tunnel in Shanxi Changping Expressway, this Paper integrated a variety of research methods include data investigation, numerical simulation,theoretical analysis and so on, focusing on the research of rapid excavation technology Parameters for drilling-blasting method in long hard rock tunnel, the research results can effectively guide the engineering practice. The main work of this Paper is as follows:(1) Based on the surrounding rock loose circle theory, this Paper studied the distribution rules and characteristics of stress and deformation for tunnel surrounding rock under the different circulation footage and clears the correlation between cyclicfootage and the stability of tunnel surrounding rock, the reasonable blasting cyclicfootage suggested value are obtained accordingly from the angle of construction safety;(2)This Paper studied the relationship between blasting cyclicfootage and the factors of construction organization,such as the amount of the blasting circulation, the amount of excess slag, the amount of slag, the construction period, etc. And the conclusion that reasonable blasting cyclicfootage for suggested value was gived accordingly from the perspective of the construction organization of and combining with the requirement of the construction safety. |
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