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`Mathematical Problems in EngineeringVolume 2018, Article ID 5404835, 9 pageshttps://doi.org/10.1155/2018/5404835`
Research Article

## Optimization of Inner Dumping Uncovered Height with Partially Covered End Wall in Adjacent Surface Coal Mining Districts

1School of Energy Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China
2State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
3School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
4Department of Mining, Xinjiang Institute of Engineering, Urumqi, Xinjiang 830000, China

Correspondence should be addressed to Li Ma; moc.liamtoh@68712ilam and Zhiguo Chang; nc.ude.tmuc@gzgnahc

Received 14 April 2017; Accepted 27 July 2017; Published 3 January 2018

Academic Editor: Anna M. Gil-Lafuente

Copyright © 2018 Li Ma 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

In order to analyze the relationships of inner dumping with covered end wall in adjacent surface coal mining districts, a trough-shaped uncovered end wall model was put forward. A mathematical model concerning uncovered end wall height (UEWH) was established based on minimum cost method. The inner dump capacity was considered regarding its effect on UEWH. Besides, a comprehensive model was established for calculating optimal UEWH in inner dumping with partially covered end wall mode and a shifting distance optimization model based on cost compensation method for building a provisional haulage system to connect inner dump. As for case study in Huolinhe number 1 surface coal mine, research results show that optimal UEWH was 225 m between North Pit and South Pit whereas in number 3 mining district of North Open-Pit Mine it was 23.50 m when making its transition from cross mining to mining along strike. Nevertheless, due to limited inner dump capacity, inner dump height in South and North mining districts shall be appropriately increased and closed pits from earlier period shall be fully utilized to make room for inner dumping with partially uncovered end walls.