强荷载作用下随机分布非均匀颗粒材料的仿真

doi:10.12382/bgxb.2023.0755

摘要/Abstract

摘要：

混凝土内的骨料排布、重力式沉箱码头内抛石的分布、杀爆弹的破片分布等都是不均匀的、随机的,在数值模拟过程中通常将其简化为均匀分布,这种简化会对模拟结果的准确性产生影响,但尚未定性分析。为此提出非均匀颗粒材料生成算法,并将其应用到混凝土骨料、沉箱码头抛石、杀爆弹碎片的生成中,以通过数值模拟研究其在高应变率下的失效破环。选取沉箱码头为研究对象,将填石沉箱码头的数值模拟结果与简化的填砂沉箱码头数值模拟结果进行对比,分析二者的荷载情况和损伤状况。研究结果表明,冲击波在填石码头的传播速度快于填砂码头的传播速度,并且填石沉箱码头破坏比填砂沉箱码头严重。

关键词: 非均匀颗粒材料, 沉箱码头, 高应变率, 强荷载

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

中图分类号:

O383.2
TU501

李艺烁, 付用全, 白峰涛. 强荷载作用下随机分布非均匀颗粒材料的仿真[J]. 兵工学报, 2023, 44(S1): 125-131.

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.

图/表 9

图1 非均匀介质应用场景

Fig.1 Application scenario of heterogeneous media

图2 非均匀颗粒材料生成流程图

Fig.2 Flow chart of non-uniformgranular material generation

图3 填石沉箱码头数值模拟模型示意图

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

表1 TNT参数

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

表2 空气参数

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

表3 水参数

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

表4 填砂参数

Table 4 Parameters of filled sands

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

图4 模拟结果毁伤情况对比图(左为试验结果;中为填砂码头;右为填石码头)

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

图5 不同时刻冲击波云图(左为填砂;右为填石)

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

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