Prediction of compression and deformation behaviours of gangue backfill materials under multi-factor coupling effects fo
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RESEARCH ARTICLE
Prediction of compression and deformation behaviours of gangue backfill materials under multi-factor coupling effects for strata control and pollution reduction Guohao Meng 1 & Jixiong Zhang 1 & Meng Li 1 & Cunli Zhu 1 & Qiang Zhang 1 Received: 15 January 2020 / Accepted: 26 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Coal mining causes serious ecological and environmental damage. The crushed gangue is backfilled into underground goaf, which not only inhibits mining-induced subsidence but also reduces accumulation of waste on the ground: however, the effects of backfilling with gangue backfill materials in goaf are affected by a combination of multiple factors. To predict compressioninduced deformation (CID) of gangue backfill materials, key factors influencing compression and deformation characteristics of gangue backfill materials in an underground confined space (lithology, particle size distribution, lateral stress and lateral loading times) were determined. Moreover, two key factors, namely, lithology and particle size distribution of gangue backfill materials, were quantified. Based on orthogonal test design, the compression characteristics of gangue backfill materials were measured under different stress levels and coupling effects of the four key factors by utilising a self-made bidirectional loading test system for bulk materials. Furthermore, through regression, the relationships of the four key factors and axial strain were determined as well as undetermined parameters in axial stress-axial strain equations and axial stress. Based on this, an equation for predicting stress-strain relationship during compression-induced deformation of gangue backfill materials under multi-factor coupling effects was established. Comparison with the orthogonal test results shows that this equation can predict compression-induced deformation of gangue backfill materials in goaf. This is beneficial to providing a basis for predicting strata movement and surface subsidence and guidance for designing backfilling process, thus protecting the surface environment. Keywords Multi-factor coupling . Gangue backfill material . Influencing factor for compression-induced deformation . Prediction of compression-induced deformation . Ecological and environmental protection
Introduction As a large quantity of coal resources are mined out in China, the environmental problems associated therewith are becoming increasingly serious. The main reasons for the environmental damage caused by coal mining activities are as follows: mining of coal resources causes movement of roof and overlying strata of coal seams, leading to surface subsidence. This further leads to destruction of surface structures, loss of Responsible editor: Philippe Garrigues * Meng Li [email protected] 1
State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Nanhu Campus, No. 1 Daxue Road, Xuzhou 221116, Jiangsu, China
underground and surface water along the cracks
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