摘要
为研究露天梯段爆破粉尘体积分散度的分布规律和特征,采用分形几何理论建立分形分布函数,以Rosin-Rammler分布函数为基准函数,将猴子岩水电站桃花料场流纹岩爆破开采的工作边帮、出入沟、工作平盘以及爆破区作为取样点,收集粉尘样品。通过激光粒度分布仪测量样品分散度,求出函数特征值,定量表达料场粉尘分布规律。结果表明,爆破粉尘分散度具有良好的分形特征,可用分形维数D定量表示,其分形维数D为2.110-2.251;采样点的分形维数D与至爆破区距离负相关,Rosin-Rammler分布参数n与至爆破区距离正相关;远离料场爆破区采样点的样品中,悬浮颗粒、可吸入粉尘、呼吸性粉尘所占比例较大。
The work was aimed at studying the distribution law and characteristics of the dispersion degree of the blasting dust in the open air. The fractal geometry theory was used to establish the fractal distribution function, with Rosin-Rammler distribution function as the base function. Dust samples were collected from the final pit slope, main access, working berm and blasting area of material spot in Taohua material spot of Houziyan hydropower station in China. The dust dispersion was analyzed by using a laser particle size analyzer to find out the characteristic function value for the quantitative expression of material distribution of dust. The calculation shows that the blasting dust dispersion has a good property of fractal and it can be quantitatively expressed by the fractal dimension, and the fractal dimension D is between 2.110 and 2.251, that there is a negative correlation between D of sampling point and the distance from the blasting area, that there is a positive correlation between the parameter n of Rosin-Rammler distribution of sampling point and the distance from the blasting area,and that away from the sampling point of the material field blasting area, the proportions of suspended particles, inhalation dust, and respirable dust are larger.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第8期139-144,共6页
China Safety Science Journal
基金
湖北省自然科学基金资助(2014CFB690)
