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Sensors 2017, 17(5), 1044; doi:10.3390/s17051044

Deformation Monitoring of Waste-Rock-Backfilled Mining Gob for Ground Control

1
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
2
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
3
School of Civil and Environmental Engineering, Nanyang Technological University, 939798 Singapore, Singapore
*
Author to whom correspondence should be addressed.
Academic Editors: Maria Marsella and Marco Scaioni
Received: 19 March 2017 / Revised: 28 April 2017 / Accepted: 4 May 2017 / Published: 5 May 2017
(This article belongs to the Special Issue Sensors for Deformation Monitoring of Large Civil Infrastructures)
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Abstract

Backfill mining is an effective option to mitigate ground subsidence, especially for mining under surface infrastructure, such as buildings, dams, rivers and railways. To evaluate its performance, continual long-term field monitoring of the deformation of backfilled gob is important to satisfy strict public scrutiny. Based on industrial Ethernet, a real-time monitoring system was established to monitor the deformation of waste-rock-backfilled gob at −700 m depth in the Tangshan coal mine, Hebei Province, China. The designed deformation sensors, based on a resistance transducer mechanism, were placed vertically between the roof and floor. Stress sensors were installed above square steel plates that were anchored to the floor strata. Meanwhile, data cables were protected by steel tubes in case of damage. The developed system continually harvested field data for three months. The results show that industrial Ethernet technology can be reliably used for long-term data transmission in complicated underground mining conditions. The monitoring reveals that the roof subsidence of the backfilled gob area can be categorized into four phases. The bearing load of the backfill developed gradually and simultaneously with the deformation of the roof strata, and started to be almost invariable when the mining face passed 97 m. View Full-Text
Keywords: resistance transducer; deformation; backfilled gob; ground control resistance transducer; deformation; backfilled gob; ground control
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Zhao, T.; Zhang, Y.; Zhang, Z.; Li, Z.; Ma, S. Deformation Monitoring of Waste-Rock-Backfilled Mining Gob for Ground Control. Sensors 2017, 17, 1044.

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