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Generic creep behavior and creep modeling of an aged surface support liner under tension

Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 377-384页

作者： D.Guner O.Golbasi H.Ozturk Department of Mining&Nuclear Engineering Missouri University of Science and TechnologyRollaMOUSA Department of Mining Engineering Middle East Technical University(METU)AnkaraTurkey

Polymer-based materials have been motivated to be an alternative support system element in the mining/tunneling industry due to their logistic and geotechnical *** spray-on liner(TSL),a term to define the application of the material on the rock surface with a layer ranging from 2 mm to10 mm in thickness,shows some promising *** are mainly composed of plastic,polymer,or cement-based ingredients to a certain *** study intends to reveal the time-dependent response of TSL specimens,cured throughout 500 d,under four constant stress levels for stable laboratory *** results were correlated using two interrelated equations to predict the material’s service life(creep-rupture envelopes).The proposed correlations offered an insight into both the effective permanent support time and the strain amount at the liner *** time-dependent deformation of TSL,whose performance is highly responsive to creep behavior,was obtained so that the design engineers may use the findings to avoid the severe problems of material *** data were also used to develop a Burgers(four-element)creep *** the liner has a nonlinear time-dependent behavior,creep models were built for each stress level ***,a generic equation was obtained using the nonlinear parametric *** is a good agreement between the proposed model and the experimental *** proposed model can be used as a basis for future numerical studies related to the support behavior of aged surface support liners.

关键词： time-dependent modeling Thin spray-on liner(TSL) Burgers model Creep constitutive model Stand-up time

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