Study on surface movement characteristics of repeated mining under thick alluvium

KUAI Yang; LIU Hui; ZHU Xiaojun; ZHENG Liugen; CHEN Yongchun

doi:10.3969/j.issn.1001-1986.2018.02.020

Volume 46 Issue 2

Apr. 2018

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COAL GEOLOGY & EXPLORATION > 2018 > 46(2): 130-136. > DOI: 10.3969/j.issn.1001-1986.2018.02.020

KUAI Yang, LIU Hui, ZHU Xiaojun, ZHENG Liugen, CHEN Yongchun. Study on surface movement characteristics of repeated mining under thick alluvium[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(2): 130-136. DOI: 10.3969/j.issn.1001-1986.2018.02.020

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Study on surface movement characteristics of repeated mining under thick alluvium

1. Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, School of Resource and Environment Engineering, Anhui University, Hefei 230601, China;
2. School of Mining and Geomatics, Hebei University of Engineering, Handan 056038, China;
3. Ping An Mining Engineering Technology Research Institute Co., Ltd., Huainan 232001, China

Funds:

Chinese Major Projects of National Social Science Foundation (14ZDB145)

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Received Date: November 28, 2017
Published Date: April 24, 2018

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Abstract

Abstract

In order to study the influence of multi-seam repeated mining under thick alluvium on surface movement, the surface movement characteristics of Guqiao coal mine repeated mining were analyzed based on the geological and mining conditions of Huainan coal mining area. Then FLAC^3D numerical simulation model of multi-seam repeated mining under thick alluvium was built, and the surface deformation characteristics and the relationship between the number of parameters and mining times were analyzed. Research results showed that when the first mining under thick alluvium surface subsidence factor is greater than 1, the alluvium is gradually compacted. The surface subsidence coefficient presents the tendency of linear increase with the mining times, but the mining subsidence coefficient tends to be stable when the mining time reaches three as the alluvium has been compacted gradually. When the goaf reaches the supercritical size, the boundary of subsidence basin is no longer increased, but is affected by the mining depth. The tangent of main effect angle and the limit angle have linear increase relationship with mining times. The results provide theoretical basis and technical reference for studying the surface movement characteristics under thick alluvium.
- thick alluvium,
- repeated mining,
- surface movement and deformation,
- numerical simulation,
- mining times

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