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.
Highlights
Solid backfill coal mining is deemed as a scientific and green mining technology, which uses solid waste to backfill the mined-out void for ground control
The developed online deformation monitoring system was applied to evaluate the ground control of the waste-rock-backfilled miningwas gobapplied in thetoTangshan coalground mine, control
Field monitoring of the deformation of was introduced to solve the problems of mining-induced ground subsidence backfilled gob is required in order to evaluate its performance in ground control as well as for the and mined-out waste rock
Summary
Solid backfill coal mining is deemed as a scientific and green mining technology, which uses solid waste to backfill the mined-out void (gob) for ground control. In the process of mining over a certain seam thickness, the overlying rock strata movement and main roof decreased with the increase of filling ratios by numerical simulation. Order tosubsidence better understand whole field process of overlying performance of waste-rock-backfilled gob is irreplaceable for optimum backfill design, even though rock strata movement and ground subsidence in backfill mining, field evaluation of the performance is costly and time-consuming. Specific sensorscomplicated were designed to monitor the roof strata deformation and the stress of monitoring system was used to monitor the deformation of waste-rock-backfilled gob in the backfill material under complicated underground conditions. China, and the monitored data was used to analyze the system was used to monitor the deformation of waste-rock-backfilled gob in the Tangshan coal mine, evolution process of theand overlying roof strata of the. Used to analyze the evolution process of the overlying roof strata of the gob
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