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Mechanical Properties and Fracture Mechanism of Pre-holed Rock under Impact Load
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Hao WU1, 2, 3, Ao-qi FAN2, Yong-sheng JIA1, Meng-lai WANG3, Shu-jian LI3, Bin ZHANG3
Blasting | 2023, 40(4) : 1 - 12
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Blasting | 2023, 40(4): 1-12
• THEORETICAL AND TECHNOLOGICAL EXPLORATION •
Mechanical Properties and Fracture Mechanism of Pre-holed Rock under Impact Load
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Hao WU1, 2, 3, Ao-qi FAN2, Yong-sheng JIA1, Meng-lai WANG3, Shu-jian LI3, Bin ZHANG3
Affiliations
  • 1.Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China
  • 2.School of Mines, China University of Mining and Technology, Xuzhou 221116, China
  • 3.National Engineering and Technology Center for Development & Utilization of Phosphorus Resources, Yunnan Phosphate Chemical Group Co., Ltd., Kunming 650600, China
Published: 2023-12-01 doi: 10.3963/j.issn.1001-487X.2023.04.001
Outline
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It is prone to occur dynamic disasters such as roof falling, sidewall slabbing and rock burst under dynamic disturbance of mechanical percussion drilling and explosive blasting in the roadway with hard rock. It is extremely meaningful to investigate the dynamic load effect on roadway deformation and failure mechanism. To understand the mechanical behavior of roadway surrounding rock under dynamic disturbance, a hard rock roadway was simplified as a hole in rock. And then, a series of impact tests were conducted on prismatic sandstone rock specimens with a hole by a modified split Hopkinson pressure bar testing system to explore the influence of hole size and shape on the dynamic mechanical properties, failure mode and energy dissipation characteristics. The results show that the existence of the hole has significant weakening effects on the dynamic strength, dynamic elastic modulus and peak strain. The dynamic mechanical properties of the rock decrease significantly with the increase of hole size. Among the specimens with different hole shapes, the dynamic strength and peak strain of the square-holed specimens are the largest, followed by the horseshoe-holed and the circle-holed specimens, but their elastic moduli show opposite results. In terms of rock failure modes, splitting tensile and tensile-shear failure occur respectively in intact specimens and pre-holed specimens under impact load. Additionally, the energy consumption density and fractal dimension of the horseshoe-holed specimens are the largest, which are 1.94 J/cm3 and 2.11 J/cm3, respectively. It indicates that the failure process is the most intense for the horseshoe-holed specimens, while the fragmentation degree of the circle and square holed specimens is not much different.

impact loading  /  rock with holes  /  dynamic mechanical property  /  failure mode  /  energy dissipation  /  fractal dimension
Hao WU, Ao-qi FAN, Yong-sheng JIA, Meng-lai WANG, Shu-jian LI, Bin ZHANG. Mechanical Properties and Fracture Mechanism of Pre-holed Rock under Impact Load[J]. Blasting, 2023 , 40 (4) : 1 -12 . DOI: 10.3963/j.issn.1001-487X.2023.04.001
Funding
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  • National Natural Science Foundation of China(52204160)
  • Natural Science Foundation of Jiangsu Province(BK20210515)
  • China Postdoctoral Science Foundation(2022MD713814; 2023T160555)
  • Foundation of Hubei Key Laboratory of Blasting Engineering(BL2021-10)
  • National Key R&D Program(2022YFC2905600)
Appendix
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Year 2023 volume 40 Issue 4
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90
43
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Article Info
doi: 10.3963/j.issn.1001-487X.2023.04.001
  • Receive Date：2022-11-30
  • Online Date：2026-03-19
  • Published：2023-12-01
Article Data
Affiliations
History
  • Received：2022-11-30
Funding
National Natural Science Foundation of China(52204160)
Natural Science Foundation of Jiangsu Province(BK20210515)
China Postdoctoral Science Foundation(2022MD713814; 2023T160555)
Foundation of Hubei Key Laboratory of Blasting Engineering(BL2021-10)
National Key R&D Program(2022YFC2905600)
Affiliations
    1.Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China
    2.School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    3.National Engineering and Technology Center for Development & Utilization of Phosphorus Resources, Yunnan Phosphate Chemical Group Co., Ltd., Kunming 650600, China

Corresponding:

JIA Yong-sheng (1970-), male, Ph. D, professor, doctoral supervisor, mainly engaged in research on blast mechanics and blasting engineering, (E-mail) .
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https://castjournals.cast.org.cn/joweb/bp/EN/10.3963/j.issn.1001-487X.2023.04.001
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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