Study on blasting fragmentation mechanism of burnt rock in open-pit coal mine

被引：3

作者：

Jia, Zheng-Zhao ^{[1
]}

Li, Hong-Jie ^{[1
]}

Li, Wei ^{[1
]}

Yan, Jie ^{[1
]}

Wang, Xiao-He ^{[2
]}

机构：

[1] China Coal Res Inst, Beijing 100013, Peoples R China

[2] China Univ Min & Technol Beijing, Sch Energy & Min Engn, Beijing 100083, Peoples R China

来源：

SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期

关键词：

Open-pit mine; Burnt rocks; Bench blasting; Blasting mechanism;

D O I：

10.1038/s41598-024-55802-2

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A large number of burnt rocks in some open-pit mines in Xinjiang, Inner Mongolia and Ningxia have a great influence on the blasting effect. For this kind of rock, through the analysis of physical and chemical changes, combined with ANSYS/LS-DYNA and PFC 2D numerical simulation software, a burnt rock model with multiple joint cracks and irregular distribution is constructed to simulate the blasting process of burnt rock under the combined action of stress wave and detonation gas. The results show that the fracture of rock mass affects the propagation of blasting cracks in the fracture area, resulting in stress concentration and stress hindrance. The action time of stress wave is reduced, and the energy of blasting gas is partially absorbed by the fracture, resulting in uneven stress on the burnt rock bench and seriously affecting the bench blasting effect.

引用

页数：16

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