爆破2025，Vol.42Issue(2)：44-51,8.DOI:10.3963/j.issn.1001-487X.2025.02.005
低透气性煤样爆破致裂裂纹扩展特征试验研究
Experimental Study on Crack Propagation Characteristics of Blasting-Induced Fracturing in Low-permeability Coal Samples
摘要
Abstract
Pre-split blasting has emerged as a crucial technique for enhancing the permeability of low-permeabil-ity coal seams and improving gas drainage efficiency.While extensive research has focused on the effects of factors such as blast hole configuration,charge structure,charge coefficient,explosive quantity,and the propagation dynamics of blasting stress waves,limited attention has been given to fracture expansion characteristics through numerical simu-lations.Furthermore,experimental investigations into crack propagation remain scarce.This study addresses these gaps by examining low-permeability coal samples from a specific mine,employing small-dose coupled charge blasting technology combined with computerized tomography scanning technology.The experimental approach enabled the ac-quisition of macroscopic damage characteristics and three-dimensional crack distribution patterns post-blasting,facili-tating an in-depth analysis of internal crack expansion under blasting stress.Key findings demonstrate the feasibility of utilizing detonating explosives instead of conventional explosives for small-scale coal sample blasting experiments with low-dose coupled charges.The results reveal that:(1)a larger blast hole diameter correlates with diminished crack propagation and permeability enhancement under constant charge quantity and tamping pressure;(2)tamped charges outperform loose charges when blast hole diameter and charge quantity are held constant;(3)an optimal charge quantity exists for fracture propagation,with excessive amounts proving counterproductive.Specifically,for the standard-sized low-permeability coal samples examined,a charge quantity of 25 mg yielded optimal results,producing a crack volume ratio of 12.79％ and a single crack volume of 20 135.03 mm,followed closely by a 20 mg charge.关键词
低透气性煤层/爆破致裂/裂纹扩展/耦合装药/CT扫描Key words
low permeability coal seam/blast cracking/crack propagation/coupled charge/CT scanning分类
矿业与冶金引用本文复制引用
张飞燕,段笑颜,韩颖..低透气性煤样爆破致裂裂纹扩展特征试验研究[J].爆破,2025,42(2):44-51,8.基金项目
国家自然科学基金资助项目(51974108、51404093) （51974108、51404093）
河南省科技攻关项目(242102320213) （242102320213）
河南省自然科学基金资助项目(232300420077) （232300420077）
河南省高校基本科研业务费专项资金资助项目(NSFRF240638) （NSFRF240638）
河南省博士后科研项目(001701014) The National Natural Science Foundation of China(Nos.51974108 and 51404093),the Scientific and Technological Project of Henan Province(242102320213),the Natural Science Foundation of Henan Province(No.232300420077),the Fundamental Re-search Funds for the Universities of Henan Province(No.NSFRF240638),the Post-doctoral Research Project in Henan Province(No.001701014) （001701014）
