It also plays practical significance and value to improve the mining efficiency of the coal mining face. ... Displacement sensor is an important part of electro-hydraulic servo-positional control system, and its performance directly affects the control accuracy of the hydraulic support position and electro control system. Therefore, the ...
Zhao et al. reported a wide strain range FBG sensor for coal mine roof monitoring [51]. ... Another field application was reported using single anchor FBG-based displacement sensors to monitor coal mine roadway roof separation [53]. Five sensors were installed along the centerline of the roof with 10 m interval where the excavation …
Mining deformation of roof strata is the main cause of methane explosion, water inrush, and roof collapse accidents amid underground coal mining. To ensure the safety of coal mining, the distributed optical fiber sensor (DFOS) technology has been applied in the 150,313 working face by Yinying Coal Mine in Shanxi Province, north …
The current market share of the oil cylinder travel sensor in the underground coal mine, subject to service conditions, is the displacement sensor [14] [15][16], which utilizes the ...
Roof displacement monitoring is an important means to ensure roof stability and prevent roof accidents of Coal Roadways (CRs). In this paper a new sensor of roof settlement displacement (RSD) monitoring of CRs' roof by the pre-stretched optical fiber (PSOF) laid out horizontally at fixed points was proposed. The principle of the sensor is …
Zhao et al. [14] designed an FBG displacement sensor to eliminate the crosssensitivity of temperature and displacement of FBG and prevent coal mine tunnel collapse by monitoring the roof ...
In this paper, a displacement sensor using optical fiber grating technology was designed, which could be used to prevent the problem of coal mine tunnel collapse …
For long-term monitoring of stress changes in coal mine rock, the sensor is affected by electromagnetic interference, drift, internal corrosion, and vibration in coal mines. ... Wang P., Hatta A., Farrell G. Experimental demonstration of a simple displacement sensor based on a bent single-mode–multimode–single-mode fiber …
Based on the above discussion and analysis, this paper design a displacement sensor using fiber grating technology, which could be used to prevent the problem of coal mine tunnel collapse by monitoring the coal mine tunnel roof displacement. 2. Design and theoretical analysis of the sensor2.1. The force and …
This system was successfully implemented at the Hassan Kishore coal mine, situated in the Salt Range of Pakistan. ... implemented optic fiber grating-based displacement sensors to assess the safety of underground mines. They concluded that the chances of tunnel (roadway) collapse can be minimized by efficiently monitoring …
The geological condition is essential for mining design and disaster control in underground coal mines. The present research focuses on the real-time assessment method on rock mass condition ...
a telpic displacement sensor for a coal mine hydraulic support comprises a shell, wherein a cable is arranged on the right side of the shell and is fixedly connected with the shell through a cable joint; the connecting assembly is arranged inside the shell; the left end of the shell is provided with a mounting seat; the right end of the mounting seat is …
the coal mining face, and its automation directly affects the coal mining efficiency. In ... Displacement sensor is an important part of electro-hydraulic servo-positional control system, and its performance directly affects the control accuracy of the hydraulic support
Visualization of complex geological structures can technically support the accurate prediction and prevention of coal mine disasters. This study proposed a new digital reconstruction method to visualize geological structures based on establishing a virtual model in the digital twin system. This methodology for the digital reconstruction of …
Combining with the characteristics of mining engineering, the arrangement requirements of sensors, such as stress sensors, displacement sensors, and pressure sensors, are analyzed.
1. Introduction. The efficiency of a country's industries and production largely depends on the natural sources of energy. Coal mines are the lifeline for electricity generation, accounting for 38.4% of the world's total electricity production (Bódis et al., 2019, World Energy Outlook, 2018).However, contamination of air, water, and soil due …
Roof displacement monitoring is an important means to ensure roof stability and prevent roof accidents of Coal Roadways (CRs). In this paper a new sensor of roof …
For example, stratums with a thickness of 50–100 m were found to exist at 150–180 m above the roof of the coal seam in the Binchang mining area (Tingnan Coal Mine, Shaanxi Province), which ...
The three-dimensional (3-D) displacements of mining areas is the basis of studying the mining subsidence law and obtaining surface movement parameters. The traditional multi-temporal interferometry …
The Maiduoshan coal mine is a major mines in the Ningdong coal base in the western mining area that has entered the deep mining phase; located in the north–south reversible tectonic zone of the ...
In general, mine operators use geomechanical monitoring for two purposes: (1) to ensure the safety of mine personnel during construction and operation of the excavation and (2) to check the validity of the assumptions, conceptual models, and values of soil or rock mass properties used in design calculations —the former requires some form of ...
underground coal mining, which can provide real-time continuous data, including r oof displacement and stress loading on roof bolts. Field application of the system in a longwall entry is presented,
Bolts support have become a major active support method in coal mine roadways to control roadway roof failure and improve surrounding rock structure stability. The traditional bolt force status …
Coal is mainly extracted from opencast mines with high mechanization and deeper depths to meet the required coal demand. However, there are many problems …
The fiber Bragg grating (FBG) strain sensors were used for on-line monitoring of the stress variation of the lined wall in the gateway retained along the goaf of No. 3203 coal mining face in Dongtan Mine. The results showed that the FBG strain sensor with the wide measuring range could measure the stress variation accurately during the support …
Download scientific diagram | Layout of the displacement sensor. from publication: Research on Physical Similarity Simulation of Mining Uphill and Downhill at the Large-Angle Working Face | With ...
PDF | On May 18, 2020, Sujata Sahu and others published Coal mining-induced displacement and its impact on human development | Find, read and cite all the research you need on ResearchGate
A Fiber Bragg Grating-Based Monitoring System for Roof Safety Control in Underground Coal Mining ... Monitoring results from the study site have demonstrated the advantages of FBG-based sensors over traditional monitoring approaches. The dynamic impacts of progressive face advance on roof displacement and stress have been …
4 COAL MINE SAFETY n2001-2005: nNumber of coal mine accidents:18,516 nNumber of death: 31,064 (AVE: 17 per day !) nIn recent years, both the government and the mine operators invested heavily on safety technologies, the fatality rate dropped, but total number still very high. nFATALITIES DUE TO EXPLOSION: nState owned mine groups have …
impact of dynamic mining on roof conditions during progressive face approaches. This paper focuses on developing a FBG-based monitoring system for roof safety control in …