The influence of borehole arrangement of soundless cracking demolition agents (SCDAs) on weakening the hard rock

• Published in: International journal of mining science and technology Vol. 31; no. 2; pp. 197 - 207
• Main Authors: Tang, Wei, Zhai, Cheng, Xu, Jizhao, Sun, Yong, Cong, Yuzhou, Zheng, Yangfeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2021; Elsevier
• Subjects: Borehole angle; Coal mine; Hard roof; Numerical simulation; Soundless cracking demolition agents; Weakening unit; Soundless cracking demolition agents; Numerical simulation; Borehole angle; Coal mine; Hard roof; Weakening unit

The hard roof difficult to collapse easily causes gas accumulation, which threatens the production safety of coal mine. Therefore, roof pre-cracking is required. Although blasting and hydraulic fracturing can also crack the roof, blasting can easily induce rock bursts, whereas hydraulic fracturing n...