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Open AccessArticle

Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal

by Yulong Chen 1 and Yingchun Li 2,3,*
1
School of Energy and Mining Engineering, China University of Mining and Technology, Beijing 100083, China
2
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
3
State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Shenhua Group Corporation Limited, Beijing 100011, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(1), 270; https://doi.org/10.3390/en13010270
Received: 28 November 2019 / Revised: 1 January 2020 / Accepted: 3 January 2020 / Published: 5 January 2020
(This article belongs to the Special Issue Advanced Technologies for Energy Exploitation of Coals)
Roof collapse and wall spalling in mines commonly occurred. Grouting in the rock mass of a collapsed zone is one of the most effective technologies for solving this problem. Through grouting, the rock mass of a collapsed zone can be cemented into continuous and stable blocks, and the physical and mechanical parameters of the rock mass can be significantly improved. In order to investigate the mechanical properties and damage of rock samples after the injection of a high-polymer material, we conducted uniaxial compression tests in a laboratory on grouted specimens. A high-polymer material is commonly used to address the gangue stacking that is caused by large roof collapse and wall spalling accidents in the mining face and the cracking of coal walls. Research has shown that a high-polymer material effectively solidifies gangues. The results indicate a micromechanics effect of the grouted specimens under uniaxial compression. The compressive strength, fracture propagation, damage mode, and other specimen behaviors are related to the amount of injected high-polymer materials. A high-polymer material substantially improves the mechanical strength of the prefabricated fractured coal and rock mass via strong material adhesion. The vertically- and horizontally-consolidated coal/rock masses exhibit different properties. The use of a high-polymer material results in distinct properties of the consolidated coal and rock masses. View Full-Text
Keywords: high-polymer material; grout; coal high-polymer material; grout; coal
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Chen, Y.; Li, Y. Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal. Energies 2020, 13, 270.

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