Results 41 to 50 of about 1,482 (145)
Meikuang Anquan, 2020 In order to improve the top coal resources at both ends of fully mechanized top coal caving face in extra-thick seam and the recovery rate of coal resources during the initial caving, reduce the impact of initial weighting on the working face during the
SUN Zhenping
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Meitan kexue jishu, 2023 The excavation thickness of the coal seam and the corresponding motion space of the overlying strata are so large in the fully-mechanized top coal caving face, that roof accidents are occur easily.
XU Gang +8 more
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Failure Depth of a Floor of a Fully Mechanized Working Face When Passing a Collapse Column [PDF]
Advances in Civil Engineering, 2018 The stress change law of a collapse column and the failure depth of a coal seam floor before and after mining when the fully mechanized coal mining face passes through the collapse column are investigated. Here, we present the constructed program in FISH language, render the damage variable in FLAC3D to establish the numerical model, and complete the ...
Jinlong Cai, Min Tu, Wensong Xu
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Study of Abutment Pressure on Fully Mechanized Working Face Advancing Speed
Mine Engineering, 2016 在煤矿生产中，工作面的推进速度是影响支撑压力的重要因素之一。文章基于火铺矿21126综采工作面生产技术及地质条件，采用现场矿压实测及FlAC3D数值模拟，研究了不同推进速度时的矿压显现规律。研究表明，工作面前方35~80 m区段内，应力变化较大，受采动影响较为强烈;工作面前方35 m范围内应力变化剧烈，受采动影响十分严重。推进速度大于7 m/d时石门右侧塑性区范围加大，右侧围岩松散垮落现象明显，支护工作难度加大，所以工作面推进速度为5~7 m/d较为合理。 In coal mine production, the speed of working face advancing is one of the important factors affecting the support pressure.
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CO emission regularity and its influencing factors in a fully mechanized caving face
AIP Advances, 2021 To explore the problem of CO concentration overrun in fully mechanized caving faces, a multiphysical field coupling model of CO emission regularity was established in this study based on the gas flow theory, gas concentration field theory, and heat ...
Xinlei Jia +4 more
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Positioning system of fully mechanized working face based on UWB and laser ranging
Gong-kuang zidonghua, 2021 Traditional wireless positioning technology has low accuracy, and UWB positioning technology can achieve centimeter-level high-precision positioning to meet the accuracy requirements of the fully mechanized working face positioning systems. However, the existing researches ignore the impact of position change of the base station installed on the ...
NIU Yonggang, +5 more
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Geo-Resources Environment and Engineering, 2017 Aiming at characteristics of the soft coal roadway engineering geology and deformation, the exposure research of the soft coal seam, theoretical analysis, numerical calculation and program design were carried out. First of all, according to the disclosure, soft coal seam engineering characteristics and geological conditions in Xinxing coal mine were ...
Genshui Wu +3 more
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Gong-kuang zidonghuaIn the stratified fully mechanized caving of ultra-thick coal seams, the inclined layout of upper and lower caving faces leads to lower fully mechanized caving face intermittently crossing residual coal pillars of the upper layer. This results in complex
LIU Yong +7 more
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Sustainability, 2022 The roof control of a fully mechanized mining face has a significant impact on coal extraction. Therefore, information about strata behavior and differentiated control measures for abnormal roofs are needed. In the present research, we used the ground pressure theory to calculate the interval of the first and periodic weighting of working faces 11113 ...
Qiang Fu +4 more
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Design of remote operating station of support of fully-mechanized automation system
Gong-kuang zidonghua, 2016 In view of the problem that existing fully-mechanized automation system of working face takes manual operation means as main control means which needs more staff present, a remote operating station of support of fully-mechanized automation system was ...
YAO Yupeng
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