Simulation analysis of human pressure during accident of people entrapped in warehouse grain mass

doi:10.16265/j.cnki.issn1003-3033.2025.07.0145

Abstract

Abstract:

In order to prevent the accident of people entrapped in the grain mass of warehouse and protect the life safety of workers, the discrete element engineering EDM(EDEM) method was proposed to simulate the distribution of human body pressure. Firstly, the soft sphere particle model and the basic particle contact model Hertz-Mindlin (no slip) were selected to construct the wheat, corn and rice grain particle models, and the multi-body pressure model of the human body was constructed by coupling multi-body dynamics and EDEM. Secondly, the accident area model was constructed and the simulation parameters were set considering the factors such as accident scene and calculation amount. Finally, the simulation of particle motion process and the analysis of human body surface pressure were completed, and the human body force distribution measuring device of people entrapped in the grain mass was developed. The results show that the buried time of different grains is slightly different, with wheat being less than corn and less than rice. The maximum pressure on the surface of the human body can reach 1.4×10⁶ Pa which fluctuates violently. The average maximum pressure of the weighted sum of the wheat warehouse is 9 864 Pa, that of corn warehouse is 8 255 Pa, and that of rice warehouse is 7 283 Pa. The pressure distribution data provides a reference for accident prevention and related safety training, and provides ideas for the development of protective devices.

Key words: warehouse, accident of people entrapped in grain mass, human pressure, discrete element method(DEM), granular model

CLC Number:

X954农、林、渔业安全

CUI Pengcheng, HE Xiaowei, CHEN Xin, ZHANG Tao, ZHANG Jinning, TONG Ruipeng. Simulation analysis of human pressure during accident of people entrapped in warehouse grain mass[J]. China Safety Science Journal, 2025, 35(7): 151-158.

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粮食种类	形状	大小/ mm	颗粒数量/个	粗化倍数
小麦	椭球型	长轴:6.5; 短轴:3.5	3	5
玉米	类马齿型	长:14.2; 宽:9.7; 高:4.2	5	2.5
稻谷	椭球型	长轴:7.2; 短轴:3.1	3	10

序号	部位	质量/kg	序号	部位	质量/kg
1	头	3.52	7	左大腿	8.72
2	左大臂	2.12	8	右大腿	8.72
3	右大臂	2.12	9	左小腿	4.28
4	左小臂	1.2	10	右小腿	4.28
5	右小臂	1.2	11	左脚	1.52
6	胸	40.8	12	右脚	1.52
合计			80 kg

粮食种类	小麦	玉米	稻谷	粮仓
泊松比	0.25	0.23	0.4	0.33
弹性模量/MPa	600	298	110	3 000
密度/(kg·m^-3)	1 460	1 140	970	2 600
颗粒间恢复系数	0.5	0.56	0.6	—
颗粒与仓壁间恢复系数	0.6	0.66	0.6	—
颗粒间静摩擦因数	0.33	0.31	0.5	—
颗粒与仓壁间静摩擦因数	0.4	0.4	0.3	—
颗粒间滚动摩擦因数	0.05	0.38	0.16	—
颗粒与仓壁间滚动摩擦因数	0.03	0.22	0.01	—