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Subsidence prediction method of solid backfilling mining with different filling ratios under thick unconsolidated layers

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Abstract

Solid backfill mining for coal pillar recovery in industrial squares has to ensure that the mine infrastructure, such as the shafts and substations, is not degraded or has its utility impaired by that mining. At the same time, it is important to recover as much coal as possible. As a result, it is necessary to predict mining subsidence during solid backfilling mining of coal pillars in industrial squares and to optimize the design of the working faces. At the Baishan coal mine in Anhiu province, China, there are thick layers of unconsolidated overburden above the coal seam so it is not appropriate to use the surface subsidence prediction method of equivalent mining height to predict subsidence during the mining of the coal pillars there. In order to find a reasonable coal pillar recovery scheme for the Baishan mine, a numerical simulation method is used to determine the relationships between the compression ratio of the backfilling material and the surface subsidence prediction parameters. Research was done to determine the appropriate parameters, and based on the final prediction parameters and taking the mandated protection standards for buildings and structures into account, surface subsidence is predicted and a backfill mining scheme for pillar recovery is proposed. The results show that of the six mining schemes considered, scheme 5 is the best scheme for coal pillar recovery in the industrial square at the Baishan mine. The research results are significant for similar mines with thick unconsolidated overburden anywhere in the world.

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Acknowledgments

We thank David Frishman, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

Funding

This work was funded by the Primary Research and Development Plan of Shandong Province (Grant No. 2017GGX90102), the Project of Shandong Province Higher Educational Science and Technology Program (Grant No. J17KA217), and the NASS Key Laboratory of Land Environment and Disaster Monitoring (NO. LEDM2014B04).

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Correspondence to Changqing Ma or Huaizhan Li.

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Ma, C., Li, H. & Zhang, P. Subsidence prediction method of solid backfilling mining with different filling ratios under thick unconsolidated layers. Arab J Geosci 10, 511 (2017). https://doi.org/10.1007/s12517-017-3303-7

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