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Experimental study on the effect of granular backfill with various gradations on the mechanical behavior of rock

International Journal of Mining Science and Technology 2021年第5期31卷 889-899页

作者： Zhihua Le Qinglei Yu Wancheng Zhu Hongyuan Liu Tianhong Yang Center for Rock Instability and Seismicity Research Northeastern UniversityShenyang 110819China School of Engineering AMC the University of TasmaniaTAS 7005Australia

Backfilling is a common practice in the mining industry and the backfilling performance plays a significant role in supporting the surrounding rock *** evaluate the backfilling performance,an experimental apparatus has been developed to understand how backfill affects the compressive strength of sandstone specimens in the *** were selected to model the backfill and divided into six groups with different particle sizes using a set of standard *** backfilling pebbles with three types of particle size compositions were then produced,*** gradation,two adjacent gradations,and increasingly widening gradations.A series of compressive tests were carried out to study the mechanical behavior of the sandstone specimens confined by these *** effects of the gradations of the filled pebbles on the peak and residual compressive strengths were *** is found that the increasing amount of the compressive strength is over 10%in most cases,even up to 20%.Based on the experiment data,the increasing amount was also estimated theoretically under some assumptions and it further confirmed the experimental *** effects are closely related to the gradations of the filled pebbles except for their dense degree.

关键词： Granular backfill Dense degree gradations Sandstone Compressive strength

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Simple Classical Lie Algebras in Characteristic 2 and Their gradations, II

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Algebra Colloquium 2014年第2期21卷 207-214页

作者： Alexandre N. Grishkov Marines Guerreiro Instituto de Matematica e Estatfstica Universidade de Sao Paulo Sao Paulo-SP Brazil Departamento de Matematica Universidade Federal de Vicosa Vicosa-MG Brazil

This paper is a continuation of [2]. We prove Conjecture 5.1 of [2] which gives a characterization of simple Lie algebras of finite dimension of type B2e, C2e, D2e＋1, E7 and Es in terms of some gradations of these al... 详细信息

关键词： Lie algebras characteristic 2 gradations

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