白鹤滩旱谷地灰岩爆破碎石颗粒形状及比表面积特征研究

doi:10.13722/j.cnki.jrme.2018.1367

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摘要在白鹤滩水电站旱谷地料场3个爆堆中随机选取部分粒径为5～1 000 mm灰岩碎石颗粒为研究对象，按形状将其分为5类。利用三维激光扫描仪和自主设计的三维形状特征测量系统得到5种形状爆破碎石颗粒的轮廓投影，采用图像处理技术计算颗粒的形状参数并用SPSS软件进行统计分析；分析5种形状爆破碎石颗粒比表面积的变化规律，并绘制旱谷地灰岩爆破碎石颗粒比表面积累计分布曲线。结果表明，爆堆中六面体碎石颗粒占52%，五面体碎石颗粒占17%，四面体碎石颗粒占13%，针片状碎石颗粒占13%，还含有5%不规则多面体碎石颗粒；六面体碎石颗粒最接近球形，五面体和四面体碎石颗粒近似球形；5种形状爆破碎石颗粒的圆度和球度随粒径增加而增加；粒径越小，爆破碎石颗粒的棱角性越丰富；单位体积炸药消耗量为0.37～0.38 kg/m3时，5种形状灰岩爆破碎石颗粒表面纹理相似；旱谷地灰岩5～1 000 mm爆破碎石颗粒的比表面积为179.84～3.82 mm2/g；粒径相同时，5种形状碎石颗粒的比表面积差异不明显，总体上爆破碎石颗粒的比表面积随粒径增加呈指数减小；利用级配曲线和比表面积曲线可推求爆破碎石颗粒的比表面积累计分布曲线。

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	李瑞泽1
	2
	卢文波1
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	尹岳降3
	于永军3
	陈明1
	2
	夏文俊1
	2
	严鹏1
	2

关键词 ：岩石力学, 爆破碎石颗粒, 比表面积, 三维激光扫描, 图像分析

Abstract：A number of blasting gravel particles of limestone with the particle size ranging from 5 to 1 000 mm were randomly selected in the Hangudi quarry and then were classified into 5 groups according to the form. The particles outline projections were obtained by the 3D laser scanner and the self-designed measurement system，and the shape parameters of blasting gravel particles were calculated and analyzed by image processing technology and SPSS. The change law of the specific surface area of the 5 types of blasting gravel particles was analyzed，and the cumulative distribution curve of the specific surface area was drawn. The results show that the proportions of hexahedral，pentahedral，tetrahedral，flat and elongated，and irregular polyhedron particles are respectively 52%，17%，13%，13% and 5% in muckpiles. The hexahedron particles are most similar to a sphere in shape，followed by pentahedron and tetrahedron particles. The roundness and sphericity of 5 types of gravel particles increase with increasing the particle size，and the angularity is stronger as the particle size decreases. The surface texture of the gravel particles selected is similar and the specific surface area is in the range of 179.84–3.82 mm2/g with a specific charge of 0.37–0.38 kg/m3. The differences of the specific surface area between 5 types of gravel particles can be ignored in the case of the same particle size，and the specific surface area decreases exponentially with increasing the particle size. The cumulative distribution curve of the specific surface area can be obtained by using the gradation curve and the specific surface area curve.

Key words： rock mechanics blasting gravel particles specific surface area 3D laser scanning image analysis

引用本文:

李瑞泽1，2，卢文波1，2，尹岳降3，于永军3，陈明1，2，夏文俊1，2，严鹏1，2. 白鹤滩旱谷地灰岩爆破碎石颗粒形状及比表面积特征研究[J]. 岩石力学与工程学报, 2019, 38(7): 1344-1354.
LI Ruize1，2，LU Wenbo1，2，YIN Yuejiang3，YU Yongjun3，CHEN Ming1，2，XIA Wenjun1，2，YAN Peng1，2. Study on the shape and specific surface area characteristics of blasting gravel particles of limestone in Hangudi quarry of Baihetan. , 2019, 38(7): 1344-1354.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1367 或 http://www.rockmech.org/CN/Y2019/V38/I7/1344

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