文献类型：期刊文献

英文题名：Experimental study and field application of hydraulic flushing technology in soft coal seam

作者：Zhao, Xun Hu, Bei Nie, Baisheng Liu, Xianfeng Zhao, Dan Li, Hongsheng Deng, Chuan Duan, Zhengpeng

第一作者：Zhao, Xun;赵训

通信作者：Hu, B[1];Hu, B[2]

机构：[1]Guizhou Inst Technol, Inst Min Engn, Guiyang 550025, Peoples R China;[2]Chongqing Univ, Sch Resources & Safety Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;[3]China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China;[4]Guizhou Mine Safety Sci Res Inst Co Ltd, Guiyang 550025, Peoples R China

第一机构：贵州理工学院矿业工程学院

通信机构：corresponding author), Chongqing Univ, Sch Resources & Safety Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;corresponding author), China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China.

年份：2025

卷号：15

期号：1

起止页码：3304

外文期刊名：SCIENTIFIC REPORTS

收录：;Scopus(收录号：2-s2.0-85217126750);WOS:【SCI-EXPANDED(收录号:WOS:001407309600007)】；

基金：This work was supported by Science and Technology Program of Guizhou Province (Qianke Support [2023] General 360), National Natural Science Foundation of China (Grant No. 52274173).

语种：英文

外文关键词：Hydraulic flushing; Stress wave; Borehole; Gas extraction; Permeability

摘要：To enhance the safety of coal mining operations and improve the efficiency of gas extraction, hydraulic flushing technology has been widely used in low permeability coal seams. This study aims to investigate the mechanism of hydraulic flushing by conducting experiments focusing on four aspects: sample strength, punching pressure, punching position and vibration direction. The results show that an increase in hydraulic flushing pressure leads to a deeper impact groove, whereas higher sample strength results in a shallower groove. Additionally, the amplitude of stress wave is positively correlated with the density of the sample, with low-strength samples exhibiting extensive stress wave propagation and minimal attenuation. The stress wave vibration is multi-directional, which can maximize the instability and destruction of the internal structure of the coal body. To validate the practical efficacy of hydraulic flushing, a field test was conducted at the Yuwu Coal Mine in Changzhi City, Shanxi Province. The field trial shows that the effective influence radius of hydraulic flushing can reach 4 m, with a significantly lower gas flow attenuation coefficient compared to ordinary borehole. Notably, the permeability of coal seam in hydraulic flushing area is close to twice that of ordinary drilling area.