Effects of moisture content and water-pressure fractures on the enhancement mechanism of blast-induced damage in coal
WANG Gang
WANG Enmao
PENG Shoujian
WANG Qi
WEI Hongzhao
LIANG Handan
Abstract：Hydraulic fracturing pre-treatment of coal can significantly enhance its blast-induced damage effect.To investigate the influencing factors and action mechanisms of hydraulic frac-turing on blast enhancement,this study adopted a combined method of theoretical analysis and laboratory testing to systematically examine the dominant control mechanisms of moisture con-tent and the number of water-pressure fractures on blast damage enhancement.Through self-made molds,cubic coal samples measuring 500 mm × 500 mm × 500 mm containing water-pressure fractures were fabricated.By integrating dynamic strain monitoring and ultrasonic damage zoning techniques,blast effects under different moisture contents and fracture num-bers were compared.The main conclusions are as follows:Under 3 g explosive blasting condi-tions,when moisture content increased by 3.8％,the crushing zone radius increased by 33.3％parallel to fractures and 166.7％perpendicular to fractures;when the number of fractures in-creased from 2 to 5,the crushing zone radius increased by 33.3％-37.0％.Pearson correla-tion analysis indicates that moisture content has a significantly greater influence on blast en-hancement than fracture quantity.These research results provide a theoretical basis for optimi-zing the synergistic process of hydraulic fracturing and blasting.
Keywords：water content ratiohydraulic fracturesexplosive blastingcoal body damagestrain
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 711-720,836 )