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Anchoring principles of a new energy-absorbing expandable rock bolt

Wen Z., Jiang Y., Han Z., Yang S., Wang X.

Engineering Transactions

2016

Vol. 64, iss. 1

89--103

The greater the mine, the harder stability control will be. And the conventional rock bolts do not adapt well to the severe rock stress conditions. An ideal bolt having a high resistance and large deformation should be developed. Based on the test results and theoretical study, this paper proposes an energy-absorbing expandable rock bolt, which consists of the bar, sleeve, bolt plate, nut, and bolt end. The anchoring mechanism and its efficiency were systematically analysed in the laboratory and in practice: the anchoring mechanism and supporting density, especially the quantitative relationship, were deduced under the Energy Balance Theory, that is, EB = 1 2 · n · F0 (u0 + 2∆u). As Compared with the conventional bolt and large deformation bolts, the new type of bolt could provide a larger constant resistance, even in the soft rock roadway with large squeezing deformation, the pulling force can be achieved by F = A · σ · f2, it mainly being generated by a normal stress acting on the pore surface. These characteristics are helpful in making the supported roadway safe. The amount of released energy during the large deforming process of the surrounding rock is expressed through conservation of energy, which can provide reference to the quantitative calculation of the bolt supporting system.

Modelowanie numeryczne pian polimerowych ukierunkowane na ich właściwości energochłonne

Miedzińska D.

Izolacje

2012

R. 17, nr 1

60-64

Piany polimerowe mają właściwości, które pozwalają na stosowanie ich w lekkich elementach konstrukcyjnych oraz systemach pochłaniających energię. W zastosowaniach tych mogą być poddawane obciążeniom wieloosiowym i dlatego konieczne jest określenie kryterium ich niszczenia. W artykule przedstawiono metody modelowania struktur otwartokomórkowych z wykorzystaniem metody elementów skończonych i zaprezentowano wyniki analiz numerycznych badanego materiału z perspektywy ich właściwości energochłonnych.

Polymer foams have the potential for use in lightweight structural components and in energy absorption systems. They may be subjected to multi-axial loads in these applications and thus it is essential to determine the criterion for the failure of foams. The article presents the methods of modeling the open cell foam microstructures with the use of the finite element method and the results of numerical analyses of the researched material with respect to their energy-absorbing capabilities.