Excavation Method of Reducing Blasting Vibration in Complicated Geological Conditions

Lixiang Xie,Wenbo Lu,Gaohui Wang,Jincai Gu

doi:10.1155/2018/2518209

Lixiang Xie, Wenbo Lu + Show 2 more

Open Access

https://doi.org/10.1155/2018/2518209

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Abstract

Drilling and blasting method as a common excavation method is widely used in the underground engineering construction. However, in the complicated geological conditions, the path of blasting excavation available has limitation, and then the larger blasting vibration is produced, which influence the stability and safety of the protected structure. To effectively reduce the blasting vibration by optimizing the blasting excavation method, firstly, the site test on blasting vibration is conducted to obtain the blasting vibration data; secondly, the LS-DYNA software is applied to simulate the vibration generated by blasting in site test, based on back analysis on the blasting vibration, the mechanical parameters of the rock mass are obtained, and they are used to simulate six different types of blasting excavation method. According to the analysis on them, the reasonable blasting excavation method is proposed to reduce the blasting vibration which can satisfy the blasting safety regulation.

Highlights

In the process of blasting operation, the shock waves, stress waves, and earthquake waves subsequently develop
The results show that different blasting excavation methods have a great influence on the vibration response in the phase I underground powerhouse
The vibration effect of blasting excavation on the phase I underground powerhouse can be effectively reduced by using the draw cut blasting method of shallow hole

Summary

Introduction

In the process of blasting operation, the shock waves, stress waves, and earthquake waves subsequently develop. Due to the existence of these waves, the internal structure of the rock mass is inevitably influenced. When the vibration velocity exceeds a critical value, it can induce the formation of internal cracks in the rock mass, causing potential harm to the structure protected [1]. In some complicated geological conditions, the path of blasting excavation has limitation, and the blasting source is close to some special protective structures which have strict requirements for blasting vibration. In such condition, to prevent the potential harm of internal crack formation resulting from the blasting vibration, the blasting excavation methods need to be optimized. The optimized blasting method can be used to reduce blasting vibration in the complicated geological conditions, which provides reference for better application of the drilling and blasting method in the engineering construction

Methods

Results

Conclusion