Abstract
The study of influence of in-situ stress on energy transmission of blasting stress wave in jointed rock mass is the basis for improving the utilization rate and optimizing the distribution of explosive energy in underground rock mass during blasting excavation. Thus, a model test was carried out to explore the energy transmission of blasting stress wave in jointed rock mass under different in-situ stresses, and the energy transmitting coefficients of the blasting stress wave were derived. Then, the influencing factors such as the scale and distribution of in-situ stresses and the angle and number of joints were discussed, respectively. The results showed that the energy transmission of blasting stress wave in jointed rock mass was affected by both the intact rock and joints, and the energy transmitting coefficients first increased and then decreased with the rise of static load and lateral static load coefficient, indicating that the lower in-situ stress can enhance the energy transmission of stress wave in rock mass to some extent. While the in-situ stress was relatively large, the stress wave energy dissipation in intact rock was dominant. The number and angle of joints also had a remarkable impact on the energy attenuation of the stress wave; when the stress wave was vertically incident on the joints, the energy transmitting coefficient was the largest. For underground engineering, the orientation of the dominant structural plane and the in-situ stress state of rock mass should be determined firstly, and the blasting parameters can be optimized to improve the utilization of explosive energy and achieve the designed blasting effect.
Highlights
In the natural or human activities such as earthquake, mining and blasting excavation in the underground rock mass, different magnitude of stress waves will be produced
Joints that widely exist in the natural rock mass significantly affect the stress wave propagation [1]. e propagation of stress wave in jointed rock mass is always accompanied by energy transmission, attenuation, and dissipation
The exploration of energy transmission of stress wave across the in-situ stressed jointed rock mass is of great significance to improve the utilization rate and optimize the distribution of the explosive energy in underground rock mass during blasting excavation
Summary
In the natural or human activities such as earthquake, mining and blasting excavation in the underground rock mass, different magnitude of stress waves will be produced. The exploration of energy transmission of stress wave across the in-situ stressed jointed rock mass is of great significance to improve the utilization rate and optimize the distribution of the explosive energy in underground rock mass during blasting excavation. Fan and Sun [26] used the nonlinear Barton-Bandis model to simulate the deformation characteristic of the joints, and utilized the DDM to study the seismic wave propagation through an in-situ stressed rock mass. Some scholars studied the energy transmission and attenuation of stress wave in jointed rock mass by theoretical or experimental approaches [28,29,30]. Researches on the effect of static stress on the stress wave energy transmission in jointed rock mass were comparatively scarce, especially through experimental methods. The influencing factors of the stress wave energy transmission, such as the scale and distribution of static loads, the angle and the quantity of joints were discussed, respectively
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