Dissipation of Impact Stress Waves within the Artificial Blasting Damage Zone in the Surrounding Rocks of Deep Roadway

Abstract

Artificial explosions are commonly used to prevent rockburst in deep roadways. However, the dissipation of the impact stress wave within the artificial blasting damage zone (ABDZ) of the rocks surrounding a deep roadway has not yet been clarified. The surrounding rocks were divided into the elastic zone, blasting damage zone, plastic zone, and anchorage zone in this research. Meanwhile, the ABDZ was divided into the pulverizing area, fractured area, and cracked area from the inside out. Besides, the model of the normal incidence of the impact stress waves in the ABDZ was established; the attenuation coefficient of the amplitude of the impact stress waves was obtained after it passed through the intact rock mass, and ABDZ, to the anchorage zone. In addition, a numerical simulation was used to study the dynamic response of the vertical stress and impact-induced vibration energy in the surrounding rocks. By doing so, the dissipation of the impact stress waves within the ABDZ of the surrounding rocks was revealed. As demonstrated in the field application, the establishment of the ABDZ in the surrounding rocks reduced the effect of the impactinduced vibration energy on the anchorage support system of the roadway.

Energy Accumulation and Dissipation of Coal with Preopening under Uniaxial Loading

“…As a human activity-induced geologic hazard, rockburst not only threatens the stability and safety of the surrounding structures but also endangers the lives of nearby workers [7,8]. In order to mitigate rockburst hazard, destressing techniques, such as drilling through large-diameter holes and stress-relief blasting, were often implemented to destroy the structural integrity of the coal and then reduce the mining-induced energy accumulation [9,10]. For drilling through the large-diameter hole technique, the number and spacing of the hole were artificially drilled and arranged in the roadway.…”

Numerical Investigation of Damage Risks of Roadway Surrounding Rocks under Oblique Incident Dynamic Loads

“…In the aspect of theoretical research, the stress criterion and energy principle for the destruction of support structure of surrounding rocks under combined effects of static load and dynamic load were deduced [13]. Moreover, a rockburst prevention mechanism of synergizing pressure relief and reinforcement of surrounding rocks was proposed, where pressure releasing area in surrounding rock masses and reinforcing rock mass of sufficient thickness were set in surrounding rock [14]. Furthermore, it was proved that the total stress of the bolt on the side facing the stress wave was the superposition of static axial stress, dynamic stress of bolt vibration, and subsidiary stress caused by the surrounding rock deformation under dynamic load [15].…”