Energy dissipation characteristics of fragmentation of frozen sandstone

被引：0
作者：
Jiang N. [1 ,2 ,3 ]
Zhang S. [3 ]
Yao Y. [1 ,2 ]
Zhou C. [3 ]
Luo X. [3 ]
Cao H. [3 ]
机构：
[1] State Key Laboratory of Precision Blasting, Jianghan University, Hubei, Wuhan
[2] Hubei Key Laboratory of Blasting Engineering, Jianghan University, Hubei, Wuhan
[3] Faculty of Engineering, China University of Geosciences, Hubei, Wuhan
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2024年 / 44卷 / 05期
关键词：
blasting fragmentation; dynamic impact; energy dissipation; frozen rock; unit explosive consumption;
D O I：
10.11883/bzycj-2023-0258
中图分类号：
学科分类号：
摘要：
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. © 2024 Explosion and Shock Waves. All rights reserved.
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