Strain evolution and failure characteristics of granite with cavities under impact load

被引：0
|
作者：
Zhou Z. [1 ]
Sun J. [1 ]
Wang H. [1 ]
Guo Y. [1 ]
机构：
[1] School of Resources and Safety Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Digital image correlation; Drop weight test; Failure characteristics; Impact load; Rock with cavities; Strain evolution;
D O I：
10.11817/j.issn.1672-7207.2021.03.003
中图分类号：
学科分类号：
摘要：
In order to study the strain evolution and failure characteristics of rocks under impact load with different numbers and arrangements of cavities, the drop weight impact test was carried out on five types of granite specimens with a single hole, double horizontal holes, double vertical holes, three horizontal holes and three vertical holes. The strain evolution and crack propagation on the surface of each specimen were recorded and analyzed by using a high speed camera and digital image correlation(DIC). The results show that the peak response force of the vertically arranged hole specimen decreases with the increase of the number of holes. There is a process of gradual movement and evolution in the high strain concentration area on the specimen surface, and shape of the high strain concentration area is a long narrow strip when passing through the hole while being elliptic when it is away from the hole. The time of high strain concentration in vertically arranged hole specimens is longer than that in horizontally arranged hole specimens. The average strain evolution of the region around the hole is significantly affected by the number and arrangement of holes, moreover, the time of the maximum average strain around the horizontally arranged hole specimens is obviously later than that in the vertically arranged hole specimens. The failure cracks of the five types of specimens are mainly axial tensile cracks, and all the specimens show obvious splitting failure. The failure pattern of the vertically arranged hole specimens is complex, and the location of local shear crack and tensile-shear mixed crack are affected by the number of holes. The final failure pattern of the horizontally arranged hole specimens is simpler than that of the vertically arranged hole specimens and the crack type is not affected by the number of holes. © 2021, Central South University Press. All right reserved.
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页码：681 / 692
页数：11
相关论文
共 42 条
  • [1] YANG Chao, PENG Fangle, Discussion on the development of underground utility tunnels in China, Procedia Engineering, 165, pp. 540-548, (2016)
  • [2] ZHAO J, ZHOU Y X, HEFNY A M, Et al., Rock dynamics research related to cavern development for Ammunition storage, Tunnelling and Underground Space Technology, 14, 4, pp. 513-526, (1999)
  • [3] USHAKOVA A., Development of underground space as transportation problem solution in St. Petersburg, Procedia Engineering, 165, pp. 166-174, (2016)
  • [4] BEREST P, BROUARD B., Safety of salt caverns used for underground storage blow out
  • [5] mechanical instability
  • [6] seepage
  • [7] cavern abandonment, Oil & Gas Science and Technology, 58, 3, pp. 361-384, (2003)
  • [8] WANG Ju, CHEN Liang, SU Rui, Et al., The Beishan underground research laboratory for geological disposal of high-level radioactive waste in China: planning, site selection, site characterization and in situ tests, Journal of Rock Mechanics and Geotechnical Engineering, 10, 3, pp. 411-435, (2018)
  • [9] PROCHAZKA P P, KRAVTSOV A N, PESKOVA S., Blast impact on structures of underground parking, Underground Spaces: Design, Engineering and Environmental Aspects, 102, pp. 11-19, (2008)
  • [10] ZHOU Yuchun, WU Li, LI Jialong, Et al., The effect of blast-induced vibration on the stability of underground water-sealed gas storage Caverns, Geosystem Engineering, 21, 6, pp. 326-334, (2018)
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