Results 191 to 200 of about 354 (233)

Optimization of Reinforcement Schemes for Stabilizing the Working Floor in Coal Mines Based on an Assessment of Its Deformation State. [PDF]

Materials (Basel)
Akhmatnurov D, Zamaliyev N, Mussin R, Demin V, Ganyukov N, Zagórski K, Skrzypkowski K, Korzeniowski W, Stasica J.   +8 more
europepmc   +1 more source

Study on bearing capacity of Mortise-tenon and joint-flange concrete assembled foundation of transmission line under combined load. [PDF]

PLoS One
Hu X, Xi X, Zheng Y, Xiang Z, Zhang H.
europepmc   +1 more source

Application and comparative analysis of Intelligent Monitoring Technology for Grouted Pile Construction based on abaqus. [PDF]

Sci Rep
Wu R, Jiang Y, Zhao S, Chen M, Shang S, Lang X.   +5 more
europepmc   +1 more source

Mechanism and control of floor heave in two entry retained roadways using dense boreholes. [PDF]

Sci Rep
Xu Q, Li XH, Xia Z, Zheng CK, Li YH, Huang G.   +5 more
europepmc   +1 more source

The entry retained along gob side with small coal pillar and its surrounding rock control: a case study. [PDF]

Sci Rep
Li L, Yang Y, Wu L, Zhang W, Yang W, Zhai Y.   +5 more
europepmc   +1 more source

Study on the Application of Comprehensive Gas Control Technology for Source-Separated Three-Dimensional Gas Extraction in Large Mining Faces. [PDF]

ACS Omega
Liu J, Wang Z, Wang Q, Zou S, Yang X.
europepmc   +1 more source

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Directional Drilling Automation Using a Lab-Scale Drilling Rig: SPE University Competition

IADC/SPE International Drilling Conference and Exhibition, 2020
Abstract The use of drilling automation is accelerating, mostly in the area of rate of penetration (ROP) enhancement. Autonomous directional drilling is now a high focus area automating the drilling operations. The potential impact is immense as 93% of the active rigs in the US are drilling directional or horizontal wells.
Ahmed Ramadan, Florence Fred
exaly   +2 more sources

Key technologies of small multi azimuth directional drilling rig

2020 5th International Conference on Mechanical, Control and Computer Engineering (ICMCCE), 2020
Because of the problem that conventional directional drilling rigs are large in volume and small inclination angle of openings, which cannot meet the drilling requirements of narrow tunnels in small and medium coal mines, a small multi-directional directional drilling rig has been developed.
exaly   +2 more sources

Design and analysis of stablizer of one-kilometer directional drilling rig for gas drainage

2011 International Conference on Consumer Electronics, Communications and Networks (CECNet), 2011
One-kilometer directional drilling rig is a head-type hydraulic rig, which can drill horizontal deep holes in coalseam with down-hole motor for gas drainage. To avoid the hole axis floating and the rig overturning, a stabilizer is designed for high stable ability in this paper. Stabilizer is subsequently modeled and simulated in four typical conditions
Liu Guiqin
exaly   +2 more sources