摘要
为了研究含水率对动载荷作用下黄砂岩比表面能的影响,首先设计了6种不同含水率(η=1.8%、2.1%、2.4%、2.7%、3.0%、3.3%)黄砂岩,对该批次黄砂岩利用霍普金森压杆在0.21 MPa气压下进行动态冲击;其次,对试验后碎块进行筛分,利用分形维数法探究其分形维数随含水率变化关系;最后,将不同粒径的碎块转化为该粒径范围内的球体,利用球表面积与耗散能获得黄砂岩的比表面能随含水率的变化关系。结果表明:随着含水率的升高,黄砂岩的粒径变小(由32.56 mm减小至16.83 mm),减少了48.31%,分形维数变大(由1.8750增大至2.3163),增加了23.54%;黄砂岩碎块的表面积增大(由169.89 cm^(2)增加至510.00 cm^(2)),增加了200.19%,比表面能下降(从0.06 J·cm^(-2)到0.01 J·cm^(-2)),减少了83.59%。
To study the influence of water content on the specific surface energy of yellow sandstone under dynamic load,six types of yellow sandstone with different water contents(η=1.8%,2.1%,2.4%,2.7%,3.0%,3.3%)were firstly designed and dynamically impacted by Hopkinson pressure bar under the pressure of0.21 MPa.Secondly,the fragments after the tests were screened,and their fractal dimensions were studied by the fractal dimension method.The relationship between the fractal dimension and the water content was then built.Finally,the fragments of different particle sizes were converted into spheres within the particle size range,and the relationship between the specific surface energy of yellow sandstone and the water content was obtained by using the surface area of the sphere and the dissipation energy.The results show that with the increase of water content,the particle sizes of yellow sandstone decreases from 32.56 mm to 16.83 mm,with a decrease of 48.31%,and the fractal dimension increases from 1.8750 to 2.3163,increasing by 23.54%;the surface area of yellow sandstone fragments increases from 169.89 cm^(2) to 510.00 cm^(2),with an increase of200.19%,and specific surface energy decreases from 0.06 J·cm^(-2) to 0.01 J·cm^(-2),decreasing by 83.59%.
作者
侯文光
秦金辉
HOU Wenguang;QIN Jinhui(Huozhou Coal and Electricity Liyazhuang Coal Mine,Huozhou 031400,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《武汉工程大学学报》
CAS
2021年第3期307-312,共6页
Journal of Wuhan Institute of Technology
基金
霍州煤电集团有限责任公司李雅庄煤矿地面地震勘探项目(18060601)。
关键词
动载荷
含水率
黄砂岩
分形特征
比表面能
dynamic load
water content
yellow sandstone
fractal features
specific surface energy
作者简介
侯文光,硕士,高级工程师。E-mail:2499016192@qq.com。
