On characteristics of failure zones in mass concrete subjected to underwater contact explosion

JIANG Hongjie; LU Wenbo; WANG Gaohui; LIU Yijia; WANG Yang

doi:10.11883/bzycj-2022-0415

Volume 43 Issue 10

Oct. 2023

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JIANG Hongjie, LU Wenbo, WANG Gaohui, LIU Yijia, WANG Yang. On characteristics of failure zones in mass concrete subjected to underwater contact explosion[J]. Explosion And Shock Waves, 2023, 43(10): 102202. doi: 10.11883/bzycj-2022-0415

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JIANG Hongjie, LU Wenbo, WANG Gaohui, LIU Yijia, WANG Yang. On characteristics of failure zones in mass concrete subjected to underwater contact explosion[J]. Explosion And Shock Waves, 2023, 43(10): 102202. doi: 10.11883/bzycj-2022-0415

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On characteristics of failure zones in mass concrete subjected to underwater contact explosion

doi: 10.11883/bzycj-2022-0415

JIANG Hongjie^{1, 2
,},
LU Wenbo^{1, 2
,
,},
WANG Gaohui^{1, 2},
LIU Yijia^{1, 2},
WANG Yang^{1, 2}

1.
State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, Hubei, China
2.
Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China

Received Date: 2022-09-28
Rev Recd Date: 2023-09-16
Publish Date: 2023-10-27

Abstract

Abstract

The evaluation of failure effect on concrete under explosion is of great significance to both engineering blasting construction and anti-explosion safety of engineering structures. The key is to obtain the characteristics of failure zones of the target. Firstly, main physical processes of underwater contact explosion were analyzed. Loading characteristics of underwater contact explosion were studied with the difference between underwater contact explosion and air contact explosion compared. Then, a calculation method for range of failure zones in underwater contact explosion considering the crushing effect on target from explosion shock wave and the quasi-static effect on target from detonation products was established. The quasi-static effect was further subdivided into quasi-static compression fracturing and quasi-static tensile fracturing. Finally, the proposed method was verified with finite element numerical simulation and experimental data in literatures. The results show that the expansion of detonation products is inhibited by water compared with air contact explosion. And then the duration of explosion load and the impulse acting on the surrounding medium are increased in underwater contact explosion. Circumferential compression criterion is suggested to calculate cracked zone of concrete subjected to underwater contact explosion. And fracture zone is suggested to divide into dynamic fracturing zone, quasi-static compression fracturing zone and quasi-static tension fracturing zone for calculation. Failure range of mass concrete subjected to underwater contact explosion is well predicted by proposed calculation method. With the same explosive type and water depth, the range of fracture zone is greatly influenced by the tensile strength and compressive strength ratio of concrete. This provides a basis for both blast resistance research of engineering structures and underwater engineering blasting construction.
- underwater explosion,
- concrete,
- contact explosion,
- failure mechanism,
- failure zone

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References(38)

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