A Simulation Method for Non-Uniformed Distribution of Granular Materials under Strong Loading

doi:10.12382/bgxb.2023.0755

Abstract

Abstract:

The distribution of aggregate in concrete, the distribution of ripraps in gravity caisson wharf, and the fragment distribution of high explosive projectile are all uneven and random. The distribution is usually simplified to a uniform distribution in the process of numerical simulation, which affects the accuracy of the simulated results, but it has not been qualitatively analyzed. In this paper, a method of generating a riprap model of caisson wharf is provided, and a random stone riprap caisson wharf model based on math software is established. The force characteristics and failure modes of riprap caisson wharf are analyzed. In order to explore the damage characteristics of castaway caisson pier and sand-filled caisson pier under the underwater explosion load, a comparative study of the castaway model and the sand-filled model was carried out, and the damage results of the two models under the same conditions were summarized, which provides a reference for the damage assessment of such structures. The results show that the propagation speed of shock waves in the caisson wharf is faster than that in the sand-filled caisson wharf, and the damage of the caisson wharf is more serious than that of the sand-filled caisson wharf.

Key words: non-uniform granular material, caisson wharf, high strain rate, strong loading

CLC Number:

O383.2
TU501

LI Yishuo, FU Yongquan, BAI Fengtao. A Simulation Method for Non-Uniformed Distribution of Granular Materials under Strong Loading[J]. Acta Armamentarii, 2023, 44(S1): 125-131.

Figures/Tables 9

Fig.1 Application scenario of heterogeneous media

Fig.2 Flow chart of non-uniformgranular material generation

Fig.3 Schematic diagram of numerical simulation model of rock filled caisson wharf

Table 1 TNT parameters

ρ_e/(kg·mm^-3)	A	B	R₁	R₂	ω	E₀
1.58×10^-6	373.77	3.747	4.15	0.90	0.35	6.9684

Table 2 Air parameters

ρ_a/(kg·mm^-3)	C₀	C₁	C₂	C₃	C₄	C₅	C₆	E₀
1.29×10^-9	0	0	0	0	0.4	0.4	0	2.5×10^-6

Table 3 Water parameters

ρ_w/ (kg·mm^-3)	C/ (mm·ms^-1)	S₁	S₂	S₃	γ₀	E₀
1.0×10^-6	1650	1.92	-0.096	0	0.35	2.9×10^-4

Table 4 Parameters of filled sands

ρ/(kg·mm^-3)	G/GPa
1.8×10^-6	1.601×10^-4

Fig.4 Comparison of damage conditions in simulation results (Left: test results: Middle: sand-filled caisson; Right: stone-filled caisson)

Fig.5 Nephograms of shock wave at different times (Left: sand-filled caisson: Right: stone-filled caisson)

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