Study On Blasting Technology Of Laxiwa Hydro-Power Station High Slope Excavation

It is the major way to blast the rock mass during rock slope excavation, but it is also a complicated process. Because of the complexity of the rock mass, the changeable blasting condition, and limitations of the measurements, it has not enough understanding on blasting excavation, whereas the excavation itself will severely affect the stability of the rock slope. Based on the mentioned above, the research will be meaningful on theory and application.Based on the systematic measurements and analysis of vibration of the slope rock during blast, the propagation characteristics of the blast wave are studied. The optimized parameters and the blasting net are investigated for preshearing and deep hole step-by-step blasting for the Laxiwa project. Then, the workable shock absorption measures are proposed. The detailed results are as follows:1.The parameters for deep hole preshearing blasting and step-by-step blasting are determined for the Laxiwa project;2.The net is put forward for the rock slope excavation;3.The dimensions are forecast for step-by-step excavation;4.The dimensions are determined for step-by-step excavation;5.The security control standard is proposed for the deep hole step-by-step blasting.The research shows that the blasting vibration can be controlled using a series of net and amountof blasting material control measures, under the condition of understanding the propagation characteristics.