WEBMar 18, 2019 · Coal seam thickness prediction is crucial in coal mine design and coal mining. In order to improve the prediction accuracy, an improved Kriging interpolation method on the basis of efficient data and Radial Basis Function (RBFKriging) is firstly proposed to interpolate the cutting data that is obtained in premining, especially at the .
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WEBDec 31, 2022 · Accurately predicting the height of water flowing fractured zone is of great significance to coal mine safety mining. In recent years, most mines in China have entered deep mining. Aiming at the problem that it is difficult to accurately predict the height of water flowing fractured zone under the condition of large mining depth, the mining .
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WEBSep 23, 2021 · Insitu observation was carried out to obtain the surface subsidence of No. 12 seam mining in Ningtiaota coal mine 43, the depth of longwall face N1114 is 64–165 m, the thickness of bedrock is ...
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WEBNov 1, 2010 · Aldrich used machine vision systems to measure particle size distributions of coal on a conveyor belt (Aldrich et al. 2010). Zhang et al. proposed an efficacious method to estimate the density ...
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WEBApr 1, 2024 · 2. Material and methods. The coal flow volume detection method based on TOF vision consists of three parts: image acquisition module, image processing module, and coal flow calculation module. In the image acquisition module, a TOF camera is used to capture depth images and grayscale images of the coal flow.
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WEBJul 15, 2021 · The mining height of the coal seam is m, and then the calculation of the designed vertical depth of the boreholes is – m; in actual measurement, the vertical depth of one testing borehole must be greater than m.
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WEBApr 1, 2022 · The study of hydraulic fracture height growth in coal measure shale strata with complex geologic characteristics. ... The buried depth of CMSS reservoir is approximately 3000 m and the total thickness is m. The thickness of shale and coal is m and the thickness ratio is 68%. ... Bsy the numerical control water cutting or wire ...
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WEBNov 1, 2019 · Tensile strength of the coal measures was varied and chosen in between 1/20th to 1/15th of the value as determined in laboratory. The values of the exponent b were taken as for coal measure rocks, and for coal, which are the most probable estimates obtained from the triaxial data compiled by Sheorey. Rock mass rating of the .
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WEBJun 16, 2017 · Flocculant measurement. Online measurement of the settling rate of a sample drawn from the feedwell is the fastest way to determine if the flocculant requirements of the feed have changed. An instrument called a "Clarometer" (figure 4) is available which provides an online settling rate measurement.
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WEBJan 2, 2023 · There has been a global effort in the past decade, especially in major coalproducing countries, toward understanding the mechanics involved in the stability of coal mine ribs. Buckling and spalling of mine ribs are known to have an impact on their stability and degradation. The generation, propagation, and coalescence of cracks in mine pillar .
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WEBJun 30, 2018 · (a) to (e) shows the Rock Load Height at different depth of working at m ine gallery Figure 7. Rock Load Height at 100m depth and strength MPa (RMR = 40, UCS = 30 MPa) at k = and height of
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WEBFeb 19, 2021 · Here, thickness estimation of coal layer is done with a varying height of the antenna from 5 to 100 cm with a fixed interval of 10 cm using three different highresolution algorithms through software simulation. The thickness estimation of a thin shale layer inbetween two consecutive coal layers is also carried out with varying depth of coal.
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WEBNov 28, 2011 · The machine is outfitted with 's low profile cutter module that cuts an entry 116 inches wide from floor to roof rockcoal interface. The low profile cutter module is able to mine a maximum coal seam height of 66 .
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WEBMar 8, 2024 · Understanding. Gauges for depth, as their name suggests, are precision measuring instruments used to ascertain the depth of a hole, slot, or other recessed feature. Their appliions are diverse and farreaching, spanning across industries from manufacturing to quality control, to mechanical engineering.
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WEBNov 16, 2016 · DOI: / Corpus ID: ; Study the variations of sinkhole depth with respect to working height in underground coal mines inproceedings{Poonam2016StudyTV, title={Study the variations of sinkhole depth with respect to working height in underground coal mines}, author={Sahu Poonam and D .
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WEBJul 25, 2023 · Tunnel Boring Machines (TBMs) have been used in many underground coal mines in China in recent years. The TBM is unfavorable to advance in complex geological conditions, especially in fractured zones. When the TBM advanced in the region, the surrounding rock mass damaged frequently and collapsed severely, which brought risks .
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WEBPDF | On Jan 1, 2021, Sundas Matloob and others published Safety Measurements and Risk Assessment of Coal Mining Industry Using Artificial Intelligence and Machine Learning | Find, read and cite ...
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WEBMay 14, 2016 · Sample photograph of a central part of the coal sample (a) and the corresponding depth map (b) (cali ... measure the coal volume using machine vision. ... constructing a coal layer surface height ...
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WEBIn order to improve the separation rate of coal and gangue, aiming at sorting of largesize coal and gangue based on density characteristics, a coal and gangue separation system based on machine vision was designed, and a side height calibrated shape from shading algorithm was proposed for volume detection. The density is calculated by measuring .
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WEBJan 1, 2022 · The strain at measurement point 1 in the 100intact coal samples began to increase and that at measurement point 3 rapidly decreased. The strain at measurement point 2 on the 100hole coal sample was abnormal ab: the strain was stable in advance of the applied load increasing and the strain decreased sharply thereafter. The strain in the .
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WEBThe surface is covered by thick loose aeolian sand. The thickness of the 22 upper coal seam is – m, with an average of m, the buried depth of the coal seam is 200–305 m, the average mining depth is 246 m, and the average thickness of the loose layer is 35 m, which belongs to the near shallow coal seam.
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WEBJan 12, 2017 · In Area I, the borehole had depth of 0–54 m and vertical height of 0– m and was loed in the region with maximum water seepage and highly developed cracks. Combined with the field measurement results of the No. 2 observation borehole, the height of the GFZ in the No. 7435 Face overlying strata was determined to be H = ( + 6) = .
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WEBJul 18, 2018 · In order to ensure safe production and occupational health at a largeminingheight fully mechanized mining face in a coal mine, the present study firstly establishes an airflowdust coupled model based on gas/solid twophase flow equations and combines numerical simulation and field measurement for analyzing the dispersion pattern of dust .
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WEBMay 4, 2021 · Platform Construction and Data Acquisition. The experimental platform is composed of three RGBD cameras (Azure Kinect DK), a camera tripod, three notebook computers, and three fully mechanized mining machines scaled down to the actual size of the mine including ZY4000/18/38 hydraulic support prototypes, Scraper conveyor .
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WEBJan 25, 2022 · The overburden failure height of mediuminclined coal seam increases rapidly with an increase in coal seam dip angle, while the overburden failure height of steeply inclined coal seam decreases rapidly with an increase in the coal seam dip angle (Chen et al. 2005; Li et al. 2015; Zhang et al. 2018b; Zhao and Wu 2018; Dai and Chen .
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