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A statistical model for porous structure of rocks

Science China(technological Sciences) 2008年第11期51卷 2040-2058页

作者： JU Yang1,2, YAnG YongMing1, SOnG ZhenDuo3 & XU WenJing4 1 State Key Laboratory of Coal Resources and Safe Mining, China university of Mining & technology, Beijing 100083, China 2 department of mechanical and manufacturing engineering, the university of calgary, 2500 university drive nw calgary, ab t2n 1n4, canada 3 China national Coal Mining Equipment Co. Ltd, Beijing 100011, China 4 department of Materials and Metallurgy, the university of Utah, Salt Lake City, Utah 84112, USA State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology Beijing China department of mechanical and manufacturing engineering The University of Calgary Calgary Canada China national Coal Mining Equipment Co. Ltd Beijing China department of Materials and Metallurgy The University of Utah Utah USA

the geometric features and the distribution properties of pores in rocks were in- vestigated by means of Ct scanning tests of sandstones. the centroidal coordi- nates of pores, the statistic characterristics of pore distance, quantity, size and their probability density functions were formulated in this paper. the Monte Carlo method and the random number generating algorithm were employed to generate two series of random numbers with the desired statistic characteristics and prob- ability density functions upon which the random distribution of pore position, dis- tance and quantity were determined. A three-dimensional porous structural model of sandstone was constructed based on the FLAC3D program and the information of the pore position and distribution that the series of random numbers defined. On the basis of modelling, the Brazil split tests of rock discs were carried out to ex- amine the stress distribution, the pattern of element failure and the inosculation of failed elements. the simulation indicated that the proposed model was consistent with the realistic porous structure of rock in terms of their statistic properties of pores and geometric similarity. the built-up model disclosed the influence of pores on the stress distribution, failure mode of material elements and the inosculation of failed elements.

关键词： porous structure statistical model random numbers reconstruction rocks

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Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts

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Science China(technological Sciences) 2010年第9期53卷 2435-2449页

作者： JU Yang1,2,LIU HongBin1,SHEnG GuoHua1,3 & WAnG HuiJie1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete,China university of Mining and technology,Beijing 100083,China 2 department of mechanical and manufacturing engineering,university of calgary,2500 university drive,ab t2n 1n4,canada 3 School of Resources and Civil engineering,northeastern university,Shenyang 110004,China State Key Laboratory of Coal Resources and Safe Mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete China University of Mining and Technology Beijing China department of mechanical and manufacturing engineering University of Calgary Calgary Canada School of Resources and Civil engineering Northeastern University Shenyang China

the dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×102 s-1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric *** properties of wave stress transmission,failure,strength,and energy consumption of RPC with varied fiber volumes and impact strain rates were *** influences of impact strain rates and fiber volumes on those properties were characterized as *** general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental *** investigations indicate that for the plain RPC the stress response is greater than the strain response,showing strong brittle *** RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain *** a constant fiber fraction,the peak compressive strength,corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases,with the residual strain demonstrating the greatest *** the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is *** tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different *** a constant impact strain rate and the fiber fraction less than 1.75%,the peak compressive strength rises with an increasing fiber *** peak compressive strength tends to decrease as the fiber volume exceeds 1.75%.the corresponding peak strain,however,incessantly rises with the increasing fiber *** total energy Edisp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction

关键词： impact reactive powder concrete (RPC) high strain rate dynamic strength energy consumption dynamic stress-strain response

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