Energy-accumulation blasting and water injecting under local water storage and pressure retention in heading face

• Published in: Méitàn xuébào Vol. 48; no. 11; pp. 4036 - 4048
• Main Authors: Zhenfeng WANG, Yu WANG, Tao ZHANG
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Journal of China Coal Society 01-10-2023
• Subjects: energy-accumulating blasting and water injection; gas parameters; increased permeability and pressure relief; influence radius; water storage and pressure keeping device
• ISSN: 0253-9993
• DOI: 10.13225/j.cnki.jccs.2022.1832

Due to the poor effect of local energy-accumulation blasting and water injection in the Xuehu Coal Mine and the undetermined influence range of local energy-accumulation blasting and water injection pressure relief, the spacing of blasting holes cannot be reasonably arranged in heading face. Through theoretical analysis, ANSYS/LSDYNA numericalsimulation and industrial experiments, designing a local water storage and pressure retention device, this study investigated the application of energy-accumulation blasting and water injecting under local water storage and pressure retention in the Xuehu Coal Mine. The results showed: ① the ANSYS/LSDYNA simulation reveals that the low compressibility of water can accumulate explosive energy, resulting a significant increase of coal damage range. Complete damage range of coal mass in the water medium coupling is 3.14 times of that in the air medium coupling, the range of damage crack length of coal mass in the water medium coupling is 2.71 times of that in the air medium