scholarly journals Comparison of the macroscopical stress field distribution characteristics between a novel non-pillar mining technique and two other current methods

2019 ◽  
Vol 11 (5) ◽  
pp. 168781401985041 ◽  
Author(s):  
Enze Zhen ◽  
Yajun Wang ◽  
Jun Yang ◽  
Manchao He
Keyword(s):  
Stress Field ◽  
Field Distribution ◽  
Distribution Characteristics ◽  
Mining Technique ◽  
Pillar Mining

scholarly journals Numerical Simulation Research on Distribution Characteristics of Overlying Rock Stress Field in Floor Roadway

2021 ◽  
Vol 257 ◽  
pp. 03024
Author(s):  
Zhonghua Wang
Keyword(s):  
Stress Field ◽  
Field Distribution ◽  
Theoretical Basis ◽  
Surrounding Rock ◽  
Horizontal Distance ◽  
Distribution Characteristics ◽  
Rock Stress ◽  
Simulation Research ◽  
Location Selection ◽  
Coal Roadway

In order to explore the distribution characteristics of the overlying rock stress field in the floor roadway at different locations, FLAC3D software was used to simulate and analyze the surrounding rock directly above the floor roadway and the surrounding rock within 15m on both sides of the floor roadway when the distance between the floor roadway and the coal roadway and the horizontal distance were changed. The stress field distribution characteristics are obtained, and the stress field distribution characteristics of different areas directly above and on both sides of the floor roadway are obtained, which provides a theoretical basis for the location selection and support of the floor roadway.

scholarly journals Two-dimensional flow field distribution characteristics of flocking drainage pipes in tunnel

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 139-148
Author(s):  
Shiyang Liu ◽  
Xuefu Zhang ◽  
Feng Gao ◽  
Liangwen Wei ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Flow Field ◽  
Field Distribution ◽  
Rapid Development ◽  
Maximum Velocity ◽  
Distribution Characteristics ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Laboratory Test Results ◽  
Transverse Distance ◽  
Two Dimensional Flow

AbstractWith the rapid development of traffic infrastructure in China, the problem of crystal plugging of tunnel drainage pipes becomes increasingly salient. In order to build a mechanism that is resilient to the crystal plugging of flocking drainage pipes, the present study used the numerical simulation to analyze the two-dimensional flow field distribution characteristics of flocking drainage pipes under different flocking spacings. Then, the results were compared with the laboratory test results. According to the results, the maximum velocity distribution in the flow field of flocking drainage pipes is closely related to the transverse distance h of the fluff, while the longitudinal distance h of the fluff causes little effect; when the transverse distance h of the fluff is less than 6.25D (D refers to the diameter of the fluff), the velocity between the adjacent transverse fluffs will be increased by more than 10%. Moreover, the velocity of the upstream and downstream fluffs will be decreased by 90% compared with that of the inlet; the crystal distribution can be more obvious in the place with larger velocity while it is less at the lower flow rate. The results can provide theoretical support for building a mechanism to deal with and remove the crystallization of flocking drainage pipes.

Effects of the Shape of Workpiece on the Temperature and Stress Field Distribution during Laser Transformation Hardening

2012 ◽  
Vol 39 (8) ◽  
pp. 0803001
Author(s):  
张哲 Zhang Zhe ◽  
韩彬 Han Bin ◽  
王勇 Wang Yong ◽  
王楠楠 Wang Nannan
Keyword(s):  
Stress Field ◽  
Field Distribution ◽  
Laser Transformation Hardening

The Influencing Factors on the Axial Magnetic Field Distribution Characteristics of GMA

2010 ◽  
Vol 139-141 ◽  
pp. 801-804
Author(s):  
Xiao Yang Jiang ◽  
Quan Guo Lu ◽  
Ding Fang Chen ◽  
Meng Lun Tao ◽  
Min Zhou
Keyword(s):  
Magnetic Field ◽  
Influencing Factors ◽  
Field Distribution ◽  
Optimization Design ◽  
Axial Magnetic Field ◽  
Magnetic Field Distribution ◽  
Distribution Characteristics ◽  
Output Performance ◽  
Magnetostrictive Actuator ◽  
Bottom Cover

. A direct aspect of influencing giant magnetostrictive actuator's output performance is the driving magnetic field characteristics. Therefore, research on the influencing factors on the axial magnetic field distribution characteristics of giant magnetostrictive actuator is of great significance in the design. This paper analyzes the importance of the axial magnetic field distribution characteristics, analyzes the driving magnetic field using finite element method based on a designed giant magnetostrictive actuator, studies the affections of coil height, coil shape , magnetic block material, shell material , skeleton material, bottom cover material and output shaft material on the axial magnetic field distribution characteristics and reaches some conclusions about the influencing factors on the axial magnetic field distribution characteristics of giant magnetostrictive actuator. According to this paper, it provides the guidance for the optimization design of the driving magnetic field of the giant magnetostrictive actuator.

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