Energy dissipation characteristics of fragmentation of frozen sandstone

JIANG Nan; ZHANG Shuoyan; YAO Yingkang; ZHOU Chuanbo; LUO Xuedong; CAO Huazhang

doi:10.11883/bzycj-2023-0258

Volume 44 Issue 5

May 2024

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JIANG Nan, ZHANG Shuoyan, YAO Yingkang, ZHOU Chuanbo, LUO Xuedong, CAO Huazhang. Energy dissipation characteristics of fragmentation of frozen sandstone[J]. Explosion And Shock Waves, 2024, 44(5): 055201. doi: 10.11883/bzycj-2023-0258

Citation:

JIANG Nan, ZHANG Shuoyan, YAO Yingkang, ZHOU Chuanbo, LUO Xuedong, CAO Huazhang. Energy dissipation characteristics of fragmentation of frozen sandstone[J]. Explosion And Shock Waves, 2024, 44(5): 055201. doi: 10.11883/bzycj-2023-0258

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Energy dissipation characteristics of fragmentation of frozen sandstone

doi: 10.11883/bzycj-2023-0258

JIANG Nan^{1, 2, 3
,},
ZHANG Shuoyan³,
YAO Yingkang^{1, 2
,
,},
ZHOU Chuanbo³,
LUO Xuedong³,
CAO Huazhang³

1.
State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, Hubei, China
2.
Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, Hubei, China
3.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China

Received Date: 2023-07-23
Rev Recd Date: 2023-11-20

Available Online: 2023-12-25

Publish Date: 2024-05-08

Abstract

Abstract

Typical sandstones distributed in cold regions were chosen as the research object to study the impact mechanical properties of frozen rock mass and provide reasonable unit explosive consumption for frozen rock mass in blasting excavation engineering in cold regions. Sandstone specimens with different moisture contents were prepared by the controlled mass method. Comprehensive research methods of indoor split Hopkinson pressure bar (SHPB) test and theoretical analysis are used to study the impact mechanical properties and blasting fragmentation energy dissipation characteristics of frozen sandstones. The results are as follows. (1) The dynamic compressive strength and dynamic elastic modulus of frozen sandstone are overall improved compared to the room temperature state, while the peak strain is generally decreased. Comparing the dynamic and static load test results of the mechanical properties of sandstone, the difference between the compressive strength of sandstones with the same physical parameters under dynamic and static loads is small, and the dynamic elastic modulus is significantly higher than the static elastic modulus. (2) The energy dissipation of room-temperature and frozen sandstone specimens decreases gradually with the increase of moisture content, and the energy dissipation of frozen sandstone is higher than that at room temperature. Under the moisture content of 0, 0.25ω, 0.50ω, 0.75ω, and 1.00ω, the energy dissipation of frozen sandstone increased by 21.6%, 64.9%, 80.3%, 78.2%, and 83.3%, respectively compared with the room temperature state. (3) The unit explosive consumption of frozen sandstone with the same moisture content is higher than that at room temperature, with moisture contents of 0, 0.25ω, 0.50ω, 0.75ω and 1.00ω, the unit explosive consumption of sandstone in the frozen state is 20.4%, 61.3%, 60.0%, 55.6%, and 66.7% higher than that in room temperature state. (4) By fitting the unit explosive consumption values of sandstone at room temperature and frozen state, a correction model for the unit consumption of sandstone blasting in different states is obtained, which can provide correction suggestions for the unit explosive consumption for sandstone blasting engineering in cold regions.
- frozen rock,
- dynamic impact,
- blasting fragmentation,
- energy dissipation,
- unit explosive consumption

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References(36)

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