Investigation of a non-explosive directional roof cutting technology for self-formed roadway

作     者：Quan Zhang Manchao He Jiong Wang Shan Guo Chun Zhu Zhigang Tao Chao Wang Quan Zhang;Manchao He;Jiong Wang;Shan Guo;Chun Zhu;Zhigang Tao;Chao Wang

作者机构：School of MinesChina University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Geomechanics&Deep Underground EngineeringChina University of Mining and Technology-BeijingBeijing 100083China School of Earth Sciences and EngineeringHohai UniversityNanjing 210098China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2022年第32卷第5期

页      面：997-1008页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This work was supported by the National Key Research and Development Program of China(No.2016YFC0600901) the National Natural Science Foundation of China(No.41941018) the Postgraduate Research&Practice Innovation Program of Jiangsu Province of China(No.KYCX21_2368). 

主　　题：Instantaneous expander with a single crack surface Non-explosive Directional roof cutting Self-formed roadways Pillarless mining 

摘      要：Traditional explosives have characteristics of high risk,large vibration,and poor directional fracturing.Consequently,an instantaneous expander with a single crack surface(IESCS),which is a novel nonexplosive directional rock-breaking technique,has been developed.The directional roof-cutting mechanism of the IESCS method,driven by high-pressure gas,was theoretically analyzed.Laboratory experiments and numerical simulations proved the directional slitting effect of the IESCS method to be excellent.Compared with shaped-charge blasting,the charge of IESCS was reduced by 8.9%,but the crack rate increased by 9%in field tests.After IESCS pre-splitting,the roof directionally collapsed along the cutting line,and the gangue filled the goaf.Moreover,the directional roof cutting by the IESCS could decrease roadway stress.The average pressure of hydraulic supports on the cutting side of the roof was 31%lower than that on the non-cutting side of the roof after pre-splitting.After the self-formed roadway constructed by the IESCS was stabilized,the final relative displacement of the roof and floor was 157.3 mm,meeting the required standard of the next working face.Thus,the IESCS was effectively applied to directional roof pre-splitting.The results demonstrate the promising potential of IESCS in the mining and geotechnical fields.