Model test of deep buried underground structure under ground shock induced by explosion

被引：0

作者：

Li S. ^{[1
,2
]}

Liu J. ^{[1
]}

Bao X. ^{[1
]}

Chen Y. ^{[2
]}

Zhu Q. ^{[2
]}

Wang D. ^{[1
]}

机构：

[1] Department of Civil Engineering, Tsinghua University, Beijing

[2] Institute of Defense Engineering, AMS, Beijing

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 05期

关键词：

deep buried underground structure; dynamic response; ground shock induced by explosion; model test; repeated explosion; straight wall round arch structure;

D O I：

10.14006/j.jzjgxb.2022.0094

中图分类号：

学科分类号：

摘要：

The deep buried straight wall round arch structure in the rock medium is taken as the research object in this study, to study the dynamic response, failure mode and damage mechanism of the deep buried underground structure under the impact of the explosion. A scaled test study of the underground structure under the ground impact of multiple explosion in the top with a scale of 1∶ 20 and a proportional explosion distance of 1. 69 were designed and carried out. The macroscopic phenomena and measured data of the test were analyzed, and the results show that under the initial explosion and the repeated explosion, the surface of the surrounding rock model and the vicinity of the prefabricated loading hole are seriously damaged. In contrast, the damage of the underground structure is relatively minor, the overall structure produces downward bending deformation, and an axial crack occurs on the inner surface of the vault. Under the ground impact generated by the explosion, the deep buried underground structure model mainly performs overall vibration, and the acceleration response is significant. The peak accelerations of the vault and floor of the prototype structure can reach up to 107. 05g and 97. 15g, respectively. In the initial explosion, the damage of the upper part of the surrounding rock and the axial crack at the vault lead to a decrease in the local stiffness. And the crushed area and cracks of the surrounding rock formed by the initial explosion aggravate the attenuation and leakage of the shock wave energy during repeated explosions, resulting in the reductions of the ground shock pressure on the structure, the structural strain and the acceleration response at the base plate position. It is also found that at the floor of the prototype structure, the maximum spectral acceleration in the range of the natural vibration period of the human body exceeds 10g, which poses a safety threaten to the usage of underground structures. © 2023 Science Press. All rights reserved.

引用

页码：89 / 100

页数：11

共 22 条

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