Equivalent modeling of energy dissipation in impact and rock blasting fragmentation of frozen sandstone

被引：0
|
作者：
Zhang S. [1 ,2 ,3 ]
Jiang N. [2 ,3 ]
Yao Y. [2 ,3 ]
Zhou C. [1 ]
Luo X. [1 ]
Cao H. [1 ]
机构：
[1] Faculty of Engineering, China University of Geosciences(Wuhan), Hubei, Wuhan
[2] State Key Laboratory of Precision Blasting, Jianghan University, Hubei, Wuhan
[3] Hubei Key Laboratory of Blasting Engineering, Jianghan University, Hubei, Wuhan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2024年 / 43卷 / 05期
基金：
中国国家自然科学基金;
关键词：
energy dissipation; frozen sandstone; rock mechanics; SHPB impact test; SPH algorithm; unit explosive consumption;
D O I：
10.13722/j.cnki.jrme.2023.0964
中图分类号：
学科分类号：
摘要：
In order to investigate the blastability of frozen rock in the cold region blasting project,SHPB impact tests were conducted on frozen sandstone with different moisture contents. In addition,combined with the energy distribution of columnar explosives,the characteristics of frozen sandstone impact and blasting rock -breaking energy dissipation characteristics were studied. Based on this,the unit consumption model of explosive in frozen sandstone blasting was proposed,and the numerical simulation method was used to further modify the model. The results show that:(1) as the moisture content increases,the degree of damage to the sandstone specimens gradually increases;at the same moisture content,the degree of damage to the frozen sandstone specimens is weaker than that of the normal temperature sandstone specimens. (2) As the moisture content increases,the dissipated energy of normal temperature and frozen sandstone specimens gradually decreases;at the same moisture content,the impact dissipated energy of the frozen sandstone is higher than that of the normal temperature. When the moisture content is 0w,0.25w,0.50w,0.75w and 1.00w,the increase of dissipated energy is about 21.6%,64.9%,80.3%,78.2%,and 83.3% respectively. (3) The fitting equation of unit explosive consumption and moisture content of sandstone is obtained by equivalent calculation of the impact rock breaking energy of sandstone and the blasting rock breaking energy of columnar emulsion explosive. (4) Based on the simulation results of blasting crater test,the cubic root similarity law was used to correct the unit explosive consumption and a modified unit explosive consumption model of sandstone blasting is obtained. © 2024 Academia Sinica. All rights reserved.
引用
收藏
页码：1255 / 1269
页数：14
相关论文
共 39 条
  • [1] YANG Gengshe, LV Xiaotao, Experimental study on the sandy mudstone mechanical properties of shaft sidewalls under the frozen conditions[J], Journal of Mining and Safety Engineering, 29, 4, pp. 492-496, (2012)
  • [2] LI Yunpeng, WANG Zhiyin, Uniaxial compressive mechanical properties of rock at low temperature[J], Journal of University of Science and Technology Beijing, 33, 6, pp. 671-675, (2011)
  • [3] TANG Mingming, WANG Zhiyin, SUN Yili, Et al., Experimental study of mechanical properties of granite under low temperature[J], Chinese Journal of Rock Mechanics and Engineering, 29, 4, pp. 787-794, (2010)
  • [4] PARK C, SYNN J, SHIN H, Et al., Experimental study on the thermal characteristics of rock at low temperatures[J], International Journal of Rock Mechanics and Mining Sciences, 41, pp. 81-86, (2004)
  • [5] INADA Y, YOKATA K., Some studies of low temperature rock strength[J], International Journal of Rock Mechanics and Mining Sciences, 21, 3, pp. 145-153, (1984)
  • [6] AOKI K, HIBIYA K, YOSHIDA T., Storage of refrigerated liquefied gases in rock caverns : characteristics of rock under very low temperatures[J], Tunnelling and Underground Space Technology, 5, 4, pp. 319-325, (1990)
  • [7] BAI Y, SHAN R, JU Y, Et al., Study on the mechanical properties and damage constitutive model of frozen weakly cemented red sandstone[J], Cold Regions Science and Technology, 171, (2020)
  • [8] WANG T, SUN Q, JIA H, Et al., Fracture mechanical properties of frozen sandstone at different initial saturation degrees[J], Rock Mechanics and Rock Engineering, 55, 6, pp. 3235-3252, (2022)
  • [9] LI X, WU Q, TAO M, Et al., Dynamic brazilian splitting test of ring-shaped specimens with different hole diameters[J], Rock Mechanics and Rock Engineering, 49, 10, pp. 4143-4151, (2016)
  • [10] WEN S, ZHANG C, CHANG Y, Et al., Dynamic compression characteristics of layered rock mass of significant strength changes in adjacent layers[J], Journal of Rock Mechanics and Geotechnical Engineering, 12, 2, pp. 353-365, (2020)
1234