A Numerical Simulation of the Subsidence Reduction Effect of Different Grouting Schemes in Multi-Coal Seam Goafs

Author:

Wang Hai12,Qin Yan1ORCID,Guo Yuxi1,Xu Nengxiong1

Affiliation:

1. School of Engineering and Technology, China University of Geosciences (Beijing), Xueyuan Road 29, Beijing 100083, China

2. Shanxi Traff Layout Reconnaissance Design Inst., Co., Wuluo St. 27, Taiyuan 030032, China

Abstract

Grouting is the most widely used technology for treating coal goafs. In this study, a numerical simulation method was used to establish a model of multi-seam goafs with different spacing conditions to investigate the subsidence reduction effects of various grouting schemes on multi-coal seam goafs. By varying the range and opportunity of grouting treatments, the effects of coal seam spacing, grouting treatment range, and grouting opportunity on subsidence reduction were analyzed. The results showed that: (1) With constant overburden (OB), the subsidence reduction ratio of the subgrade center increases linearly as the interburden (IB) decreases (1 ≤ OB/IB ≤ 2), then increases exponentially (2 < OB/IB), and eventually becomes stable. (2) When treatment is conducted based on the half-width of the subgrade, the width of the subgrade, and the range of the trapezoid, residual surface subsidence tends to adopt an inclined ‘W’-shape in open cutting. The surface residual subsidence exhibits a symmetrical ‘W’-shape when full-range grouting is adopted. (3) For a multi-coal seam goaf with longer mining stoppage time, the subsidence reduction ratio of the subgrade center is lower, and it is exponentially related to the grouting opportunity. As the grouting opportunity is extended and OB/IB decreases, the subsidence reduction ratio of the subgrade center declines exponentially.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference34 articles.

1. Seepage Grouting Mechanism for Foundations in Goaf Sites considering Diffusion Paths;Wang;Geofluids,2022

2. Research on Mining Fracture of Overburden in Close Distance Multi-seam;Wei;Procedia Earth Planet. Sci.,2011

3. Evolution and effect of the stress concentration and rock failure in the deep multi-seam coal mining;Zhang;Environ. Earth Sci.,2013

4. Deficiencies in 2D Simulation: A Comparative Study of 2D Versus 3D Simulation of Multi-seam Longwall Mining;Adhikary;Rock Mech. Rock Eng.,2016

5. Effect of multi-seam mining on subsidence;Ma;Int. J. Min. Eng.,1984

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