Experimental and numerical investigation on dynamic behaviors of the concrete wall in underground coal mine with hydraulic blasting demolition

• Main Authors: Xiaowei Zhai, Shibo Wu, Haitao Li, Kai Wang, Weigang Wang, Xianming Song
• Format: Article
• Language: English
• Published: JVE International 2017-05-01
• Series: Journal of Vibroengineering
• Subjects: concrete wall; hydraulic fracturing; crack propagation; hydraulic blasting; blasting demolition; shock waves
• Online Access: https://www.jvejournals.com/article/17796
• ISSN: 1392-8716; 2538-8460

In order to investigate the dynamic response and failure modes of concrete wall under hydraulic blasting load in underground tunnels, the fracture mechanism and zoning characteristics of hydraulic blasting of concrete wall was analyzed theoretically. Stress field, displacement field and energy variation laws of concrete wall has been simulated based on the finite element dynamic program LS/dyna. Meanwhile, different experimental conditions on the dynamite, reserved hole parameters such as demolition parameters are designed studied according to the blasting fracturing principle. The effects of stress wave, high pressure gas expansion effect in the dismantling process, application of line of least resistance principle and directional blasting effect control principle are analyzed. Results reveal the FSI effect between concrete wall and the water-dynamite-pore wall and the relationship between parameters of the structure and the dynamite dynamite, the concrete dynamic compressive strength and dynamic tensile strength. Numerical and experimental methods as well as conclusions will provide basis for the blasting demolition of brick concrete wall under similar conditions.