Improving Hard Rock Materials Cuttability by Hydraulic Fracturing at Mining Working Face
Source abstract
Abstract
During advancing the working face at Guojiawan Coal Mine, hard rock faults are encountered, which hinder the normal cutting of the shearer. Hydraulic fracturing is applied to pretreat the hard rock materials. Un-directional hydraulic fracturing experiments in transparent gelatin samples are carried out. The influence of the differential stress, the borehole dip angle on the initiation and propagation of un-directional hydraulic fractures (HFs) are investigated. Three field test schemes of hydraulic fracturing are proposed and implemented at the 51207 working face of Guojiawan Coal Mine. Compared with the results of different test schemes, the cutting current ratio of the shearer is reduced by 51.70% and the cutting efficiency is increased by 89.93%. Therefore, the feasibility of hydraulic fracturing to improve the cuttability of the hard rock materials is verified, which provides a theoretical basis and field guidance for hydraulic fracturing pretreatment of the hard rock materials at a coal mining working face.
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Research context
OpenAlex topics: Geotechnical and Geomechanical Engineering · Drilling and Well Engineering · Tunneling and Rock Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Deep Coal Resource Mining of Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
Jiangxi Copper Company Limited, Nanchang 330012, China
China Railway 19th Bureau Group Corporation Limited, Beijing 100176, China
Funding
National Key R&D Program of China · National Science Fund for Excellent Young Researchers of China · National Natural Science Foundation of China
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