53rd U.S. Rock Mechanics/Geomechanics Symposium,
New York City, New York
2019. American Rock Mechanics Association
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ABSTRACT: Adjacent blasting has a vibrational effect on rock mass. With repeated blasting operations, rock mass damage caused by vibration will increase cumulatively. This is a new and difficult problem in the field of blasting engineering, but few studies have focused on it. Based on the empirical formula of the particle vibration velocity in Chinese blasting design code, “Blasting Safety Regulations”, this paper analyzed the relationship between the blasting vibration velocity of particles and rock mass cumulative damage. According to Sadowski's empirical formula for blasting vibration and on-site vibration testing, it is found that there is a positive correlation between rock mass cumulative damage and attenuation index α. By analyzing the relationship of energy loss and the particle vibration velocity during blasting wave propagation, the relationship of equivalent rock mass porosity and cumulative damage is proposed. A total of 19 field blasting tests were conducted with different blasting distances and charge amounts at the Wang-shi-ling Tunnel project. The ultrasonic wave tests were also conducted, by which the relationship among cumulative damage, porosity and attenuation index α of rock mass was verified. According to this relationship, rock mass cumulative damage could be gathered by investigating the changes in the blasting vibration velocity of particles, which can be acquired by the monitoring data during sequential blasting. Rock mass blasting cumulative damage can be evaluated by using the growth rate of α. This procedure provides a new idea for the research of blasting cumulative damage theory.
The Drilling and blasting method using conventional explosives remains the main technique in underground and rock excavation projects, such as cutting slopes along the railroads or highways (Cao et al., 2016), rock mining (An et al., 2018) and tunnel construction (Chen et al., 2017). With the rapid development of infrastructure construction all around the world, engineering projects using blasting have increased significantly. With the advantages of high strata adaptability and operation simplicity, the drilling and blasting method has become more economically-efficient and less time-consuming, which has brought huge social benefits in recent years. Obviously, the blasting technique will still play an important role in rock mass engineering in the future.
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