Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling

Lu, Xinxiao; Wang, Deming; Xu, Chaohang; Zhu, Chaobing; Shen, Wei

doi:10.1016/j.tust.2015.03.011

Cited by 41 publications

(14 citation statements)

References 15 publications

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“…Structural foams are important components for automotive and aerospace structures. 61,62 The coated foam materials have been developed with superior Figure 5. Compressive stress versus strain for polymer coated (PC) concrete.…”

Section: Foam Formationmentioning

confidence: 99%

High performance epoxy/polyester-based nanocomposite coatings for multipurpose applications: A review

Kausar

2020

Journal of Plastic Film & Sheeting

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Epoxies are important thermosetting polymers with exceptional features, which have been successfully employed for coatings. Polyester blends with epoxy enhances their chemical inertness, anti-rusting, toughness, strength, glass transition temperature, and heat stability, Epoxy/polyester blends have been further reinforced with nanocarbon, nanoclay, and inorganic nanoparticles to form nanocomposite coatings. Incorporating nanoparticles in epoxy/polyester has further improved their engineering properties. This review article principally offers state-of-the-art review of epoxy/polyester blends and epoxy-/polyester-based nanocomposite coatings. The epoxy/polyester and epoxy/polyester-based nanocomposites have been employed in non-flammable, anti-corrosion, anti-microbial, and anti-wear coatings in automotive, aerospace, energy, electronics, biomedical, and civil engineering applications. In order to fully utilize their potential, rigorous future attempts are needed for progress in the related technical fields.

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Section: Foam Formationmentioning

confidence: 99%

High performance epoxy/polyester-based nanocomposite coatings for multipurpose applications: A review

Kausar

2020

Journal of Plastic Film & Sheeting

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“…Theoretically, due to the extremely complex working environment of coal mine, the boom-type roadheader should be a system with infinite degree of freedom during the horizontal cutting process. Therefore, in order to establish the dynamical coupling model of roadheader's body pose, it is necessary to make reasonable and appropriate simplification and assumption for the working state of roadheader [25][26][27].…”

Section: Overall Mechanical Analysis During the Horizontal Cuttingmentioning

confidence: 99%

Multifactor Analysis of Roadheader’s Body Pose Responses during the Horizontal Cutting Process

Zong

Zhang

Wang

et al. 2018

Shock and Vibration

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Based on the Lagrange equation in system dynamics, aiming at the horizontal cutting process, the dynamical coupling model of boom-type roadheader’s body pose was established. According to input problem of solving the model, a calculation method of the cutting head load was proposed, and the relationship between the cutting head load and pressure of the driving cylinders and swing angle of the cutting arm was obtained through simulating analysis. The simulation model was established to solve the dynamical coupling model. The cutting head load, horizontal swing angle of the cutting arm, and dip angle of coal seam were regarded as independent variables to perform changing parameter analysis in variations of the body pose. The field experiment was carried out, and the measured data is basically consistent with the simulation values. The results show that lateral displacement of the body can reach up to 6.5 cm, backward displacement can reach up to 5.2 cm, floor-based quantity can reach up to 11 cm, pitch angle of the body can reach up to 7.8°, and roll angle can reach up to 2.1°. Variations of the body pose parameters are influenced greatly by the cutting head load, while the influence from horizontal swing angle of the cutting arm and dip angle of coal seam is slighter. Among the pose parameters, floor-based quantity and pitch angle of the body vary relatively greatly, which tend to seriously influence forming quality of the roadway and should be mainly considered in deviation rectification of the roadheader’s body pose.

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“…These studies are mainly focused on auxiliary cutting assistances, new design cutting heads, new type of cutting tools, water jets on cutting heads and control system addition to roadheaders [11][12][13][14][15][16][17].…”

Section: Roadheaders and Stability Situationsmentioning

confidence: 99%

Stability Analysis of Roadheaders

Ergun¹

2017

World Congress on Mechanical, Chemical, and Material Engineering

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-Nowadays, tunnel and underground mining drivage excavation methods have become fully mechanized. Roadheaders are one of the widely used mechanical excavation machines. They have exceptional place in this area because of their low cost and flexibilty. However they have some disadvantages such as not being used in hard and unstable formations. Improvements of this ability can cause stability problems. Therefore evaluation of stability states of these machines in different cutting conditions is vitally important. Stability analysis methods should be used for design and selection of roadheaders and when applying new technologies on them.

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Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling

Cited by 41 publications

References 15 publications

High performance epoxy/polyester-based nanocomposite coatings for multipurpose applications: A review

High performance epoxy/polyester-based nanocomposite coatings for multipurpose applications: A review

Multifactor Analysis of Roadheader’s Body Pose Responses during the Horizontal Cutting Process

Stability Analysis of Roadheaders

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