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A new method of block shape classification

Science China(Technological Sciences) 2011年第1期54卷 110-115页

作者： FENG XingLong LI De WANG LiGuan JING YongBin XUN XueMei ZENG QingTian Yuxi Mining Co. Ltd. Yuxi 653100 China School of Resources and Safety Engineering Central South University Changsha 410083 China Research Center of Digital Mine Central South University Changsha 410083 China

The shapes of block within the rock mass have an important effect on the rock properties, so it＇s very important to evaluate the shapes of rock fragmentation and to determine the geometric characteristics distribution of the block. The previous methods to classify rock block shape are based on the assumption that a block shape is approximately orthogonal, which is acceptable in only a few rock masses. This paper proposes a new method for block shape classification using triangular diagram together with parameters of co-linearity e and volume coefficient K, which combines the shape categorization with block volume for statistical analysis. Rock block equivalent size calculation methods based on block shape is proposed and the block cumulative percentage of total volume statistical analysis is given. In order to verify this block shape classification method, three ideal rock masses with approximately orthogonal joint sets have been generated and simulated.

关键词： block shape co-linearity volume coefficient

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Experimental Characterization of Shape of an Aggregate by a Numerical Value—Application to Senegalese Basaltic Aggregates for Rail Transport

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Open Journal of Civil Engineering 2020年第2期10卷 131-142页

作者： Abdoulaye Diedhiou Libasse Sow Ndeye Mareme Diop Civil Engineering Department Higher Polytechnic School Cheikh Anta Diop University of Dakar Dakar Senegal

This article first talks about railways in general and ballast in particular. An inventory is then made on the modernization of the Senegalese ballast railways. In the second phase, an experimental work of characterization of basaltic aggregates of Diack (Locality of Ngoundiane, Thiès region, Senegal) is presented. The grain size studied is 25/50 mm as for any material studied for use as railway ballast. Experimental work presented consists of the characterization of the shape of an aggregate using the NF P 18-301 standard. The test consists of comparing the volume of the aggregate to that of an equivalent sphere with the largest diameter of the aggregate, by calculating the average volume coefficient. With a Representative Elementary volume (REV) of 6 aggregates, the volume coefficient “Cv” fluctuates between 0.27 and 0.49 with an average volume coefficient of 0.39 which is well above 0.15. The grains studied are polyhedral and therefore have a high mechanical resistance.

关键词： Ballast Rail Transport Basalt Shape volume coefficient

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