Results 271 to 280 of about 2,759,873 (338)

Gas barrier mechanism in non-ventilation excavation

Process Safety and Environmental Protection, 2020
Abstract Gas overruns and explosions often occur in coal mining. To deal with this problem, the spatial structure model of a new non-ventilation excavation system is constructed. Combined with the model, a simulation experiment is conducted and the variations in gas concentration in each area of the system with variations in the amount of gas ...
Fu Ming-ming, He Shuai, Yan Yiran, Shen Jianjun, Zheng Qian, Yang Xiao   +5 more
openaire   +1 more source

Mechanical-Hydraulic Coupling Simulation for Hydraulic Excavator Working Mechanism

Advanced Materials Research, 2012
Hydraulic excavator is a typical and complicated engineering machine by combination of mechanical, control and hydraulic system. It is very important for coupling analysis by use of multiple simulation tools. Hydraulic excavator mechanical model was constructed based on Pro/E 4.0.
Xiang Qiang Zhong, Li Dong Liang
openaire   +1 more source

Mechanical Excavation in Mining and Civil Industries

2013
Nuh Bilgin, Hanifi Copur, Cemal Balci
openaire   +2 more sources

Measurement of Cutting Speed of Mechanical Excavator

Applied Mechanics and Materials, 2014
Only when mining at reasonable cutting speed, can a mechanical excavator achieve high efficient and low consumption. The same cutting-angle logarithmic spiral trajectory is initially confirmed for the model of a reasonable excavating trajectory to reduce digging resistance. An analytical expression between hoisting and pushing speed is derived from the
Ya Juan Hou, Ji Sheng Wang, Ai Feng Li, Su He Gao, Guo Qiang Wang   +4 more
openaire   +1 more source

Tracked walking mechanism for large hydraulic excavators

Automation in Construction, 2018
Abstract The conventional design methods for tracked walking systems of large hydraulic excavators based on empirical formulas, does not take into account the dynamic load of the track. As such, a safety margin factor has to be adopted to ensure adequate working strength. However, the machine weight will be increased, and the hydraulic system will be
Zhixin Dong, Long Quan, Jing Yang
openaire   +1 more source

Computational mechanics of the excavation of tunnels

Engineering Computations, 1996
Contains a report on three‐dimensional finite element (FE) analyses of deformations and stresses resulting from the excavation of shallow underground railway tunnels. Multisurface elasto‐viscoplastic material models are employed for consideration of the mechanical behaviour of the soil and the shotcrete shell supporting the excavation.
Kropik, C., Mang, H. A.
openaire   +1 more source

Preliminary study on the weakening effect of microwave irradiation on Singapore Bukit Timah granite and its influence on mechanical excavation performance

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2022
X. B. Zhao, Q. H. Zhao, Q. Gong, J. L. He   +3 more
semanticscholar   +1 more source

Mechanical Underground Excavation in Rock

2016
Mechanical methods for underground excavation have the most advantage of less disturbance to the surround environment, especially in the urban area and complex ground conditions. Drilling and Breaking method, roadheader, raise boring machines, tunnel and shaft boring machines (TBM & SBM) and Bored pile are introduced in this chapter.
openaire   +1 more source

Deep excavations: monitoring mechanisms of ground displacement

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2014
As construction methods become more advanced and design more refined, better control and smaller magnitudes of ground displacements resulting from deep excavation can be achieved. Mechanisms of ground movements expected from deep excavation and methods for their prediction are briefly reviewed.
Nick Fearnhead, Kleaven Maniscalco, Jamie R. Standing, Michael S. P. Wan   +3 more
openaire   +1 more source

Behavioral and mechanical determinants of collective subsurface nest excavation

Journal of Experimental Biology, 2015
ABSTRACT Collective construction of topologically complex structures is one of the triumphs of social behavior. For example, many ant species construct underground nests composed of networks of tunnels and chambers. Excavation by these ‘superorganisms’ depends on the biomechanics of substrate manipulation, the interaction of individuals,
Daria, Monaenkova, Nick, Gravish, Greggory, Rodriguez, Rachel, Kutner, Michael A D, Goodisman, Daniel I, Goldman   +5 more
openaire   +2 more sources