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Geofluids
Volume 2018, Article ID 6418476, 12 pages
https://doi.org/10.1155/2018/6418476
Research Article

A Numerical Simulation Study of the Migration Law of Water-Sand Two-Phase Flow in Broken Rock Mass

1School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
2State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
3School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China

Correspondence should be addressed to Guanghui Jiang; moc.621@hgj_tmuc

Received 26 October 2017; Accepted 19 December 2017; Published 21 January 2018

Academic Editor: Zhongwei Chen

Copyright © 2018 Feng Du et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

When the upper parts of coal resources are exploited, the mining overburden separated strata may easily connect with the upper unconsolidated aquifers. This may cause the water-sand two-phase fluids in the aquifers to flow underground through the falling broken rock mass. It has been found that it is difficult to eliminate sand after it has entered a mine, which tends to severely restrict the restorations of mines and causes significant economic losses. This paper studied a seepage system dynamic model of water-sand two-phase fluids in broken rock mass based on related two-phase flow theories. In addition, using FORTRAN language, it established a numerical calculation program to study the migration law of water-sand two-phase fluids flowing into broken rock mass and determined the main influencing factors on the seepage characteristic parameters of water-sand two-phase fluids in broken rock mass and the amounts of sand losses.