Results 71 to 80 of about 8,734 (226)

Gas concentration prediction model for fully mechanized coal mining face

Gong-kuang zidonghua, 2018
In view of problems of gas concentration prediction method based on least squares support vector machine (LS-SVM) such as easy to fall into local optimal solution, low search efficiency and easy to occur premature convergence during parameter optimization process, a gas concentration prediction model based on ACO-LS-SVM was proposed.
LI Huan, JIA Jia, YANG Xiuyu, SONG Chunru   +3 more
openaire   +1 more source

Research on the Laws of Destructive Patterns and Control Measures of Overlying Rock in High‐Efficiency Large‐Scale Mining Faces

Energy Science &Engineering, Volume 14, Issue 4, Page 1851-1863, April 2026.
With the advancement of coal mining technology driving the development of working faces toward increased mining heights and extended lengths, the enlargement of face dimensions has led to expanded overlying strata failure zones and intensified ground pressure manifestations. Consequently, traditional methods for determining hydraulic support resistance
Chen Gong, Peilin Gong, Kang Yi, Kaijie Duan, Lizhu Liu, Peng Li   +5 more
wiley   +1 more source

Innovation progress and prospect on key technologies of intelligent coal mining

Gong-kuang zidonghua, 2018
Innovation and practice were summarized overall about intelligent fully mechanized coal mining in thin coal seam and thinner coal seam, intelligent fully mechanized coal mining of large mining height and super large mining height in thick coal seam, and ...
WANG Guofa, FAN Jingdao, XU Yajun, REN Huaiwei   +3 more
doaj   +1 more source

Application of Cutting Roof Pressure Relief Pre-fracturing Technology in Fully Mechanized Caving Face in Extra Thick Coal Seam

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
doaj   +1 more source

Characteristics of Deformation and Damage of Multi‐Thin Composite Oil Shale Top Plate Under the Influence of Different Factors

Energy Science &Engineering, Volume 14, Issue 4, Page 2118-2136, April 2026.
In this study, the key control mechanism of surrounding rock stability is revealed by theoretical analysis and UDEC‐Trigon numerical simulation method, aiming at the problem that oil shale roof is prone to separation and slip deformation under complex stress.
Jiang Xiao, Yujiang Liu, Yihui Wang, Boyuan Zhang, Yulin Wang, Tongxiaoyu Wang   +5 more
wiley   +1 more source

Homo sapiens, industrialisation and the environmental mismatch hypothesis

Biological Reviews, Volume 101, Issue 2, Page 580-601, April 2026.
ABSTRACT For the vast majority of the evolutionary history of Homo sapiens, a range of natural environments defined the parameters within which selection shaped human biology. Although human‐induced alterations to the terrestrial biosphere have been evident for over 10,000 years, the pace and scale of change has accelerated dramatically since the onset
Daniel P. Longman, Colin N. Shaw
wiley   +1 more source

Numerical Simulation Research of Fully Mechanized Coal Face of Thick Coal Seam

Gong-kuang zidonghua, 2010
According to distribution condition of joint fissures of top coal in front of fully mechanized coal face of one coal mine, a numerical calculation model of fully mechanized coal face was built, UDEC software was used to make numerical simulation for ...
ZHANG Jin-shan, ZHANG Chun-li
doaj  

Evolution characteristics of overburden structure in inclined fully mechanized caving under residual coal pillars of the upper layer

Gong-kuang zidonghua
In 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, WANG Hongwei, WU Xuesong, TIAN Chengpeng, GUAN Rongfu, NIE Yunxiao, FAN Zhiwei, CAO Peipei   +7 more
doaj   +1 more source

“Grotesque Faces and Figures”: Child Labourers and Coal Mining Technology in Victorian Nova Scotia [PDF]

, 1988
One consequence of the technological improvements in mining coal in the nineteenth century was the increased use of child labour in Canadian collieries. Focussing on the major coal-producing province of the period, Nova Scotia, this article outlines how ...
McIntosh, Robert
core   +1 more source

Failure mechanism of the coal wall at the working face based on an eccentric compression mechanical model

Deep Underground Science and Engineering, Volume 5, Issue 1, Page 127-143, March 2026.
In this study, the nonuniform distribution of the bearing pressure in front of the coal wall has been revealed based on in situ monitoring data and numerical simulation results. Therefore, an eccentric compression mechanical model of the coal wall was established to study the deformation and failure characteristics of a coal wall. The slenderness ratio
Maolin Tian, Jiabao Wang, Changsheng Wang, Shijie Sun, Lijun Han, Qingbin Meng, Sunhao Zhang   +6 more
wiley   +1 more source