Experimental Study on Anti-Explosion Performance of the Different Types of Structures in Rock under the Condition of Plane Charge Explosion Loading

Abstract

In this paper, the straight-wall-arch structure in the rock medium is taken as the research object, and the high-pressure plane charge loading test technology is adopted to study the anti-explosion performance of different types of structures under the explosion loading. Three types of structures, which are individually built with the high-performance reinforced concrete, the C30 reinforced concrete, and the C30 reinforced concrete with a foam concrete backfill layer as well, are tested, and the dynamic responses and damage characteristics of these structures are investigated. The test results show that under the condition of the same plane charge explosion loading, in the vault of the high-performance reinforced concrete test section appears a through-tensile crack with a largest transverse relative displacement between the two straight walls, and the composite structure test section only shows an intermittent crack at the arch foot, which represents a slight damage mode. Meanwhile the arch spring of the C30 reinforced concrete test section suffers a through-compression shear failure with a largest vertical relative displacement between the vault and the floor, which represents a moderate damage mode. Therefore, adopting the high-performance reinforced concrete, and the C30 reinforced concrete with the foam concrete backfill layer, can effectively decrease the damage degree of the rock structures. Compared with the C30 reinforced concrete, the high-performance reinforced concrete can improve the resistance of the structure by improving the structural strength and strengthening its capacity to absorb waves and energy dissipation, and the foam concrete backfill layer can significantly reduce the lateral and vertical relative displacement of the structural free surface and the peak stress of the structural inner layer. The composite structure test section of the C30 reinforced concrete with foam concrete backfill layer appears to be an excellent anti-explosion performance property.

Progressive Collapse Resistance Assessment of a Multi-Column Frame Tube Structure with an Assembled Truss Beam Composite Floor under Different Column Removal Conditions

“…When an engineered structure is subjected to an unexpected load, such as an explosion load or an impact load, resulting in the failure of its components, the failure time of the structural components is generally very short [28]. It is shown that the failure time of the load-bearing component at the bottom floor has a significant impact on the dynamic response of the remaining structure.…”

Progressive Collapse Resistance Assessment of Multi-Column Frame Tube Structure with Assembled Truss Beam Composite Floor under Different Column Demolition Conditions

“…When an engineer structure is subjected to an unexpected load, such as an explosion load, or an impact load, resulting in the failure of its components, the failure time of the structural components is generally very short [23]. It is shown that the failure time of the load-bearing component at the bottom floor has a significant impact on the dynamic response of the remaining structure.…”

Experimental Study on Anti-Explosion Performance of the Cavern Reinforced by Recoverable Deformation Energy Absorption Bolt

“…The research results have also been widely applied to field engineering. Some scholars have actively explored the blast resistance of anchoring and shotcrete-supported caverns [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]: Singh [1] studied the problem of blasting damage to underground mine caverns and discussed the main factors leading to cracks and peeling of the surrounding rock of caverns and proposed that the vibration amplitude of the surrounding rock caused by blasting is an important reference. By using UDEC software, Hagedorn [2] studied and analyzed the stability of anchor-spray-supported caverns after two successive impulsive loads.…”

“…By using UDEC software, Hagedorn [2] studied and analyzed the stability of anchor-spray-supported caverns after two successive impulsive loads. Nan et al [3] used the high-pressure plane charge loading test technique to study the blast resistance of different types of structures in the rock medium, focusing on the direct wall arch structure. Three types of structures were tested: high-performance reinforced concrete, C30 reinforced concrete, and C30 reinforced concrete with foam concrete backfill.…”