爆破漏斗岩石破碎块度实验与仿真

doi:10.13722/j.cnki.jrme.2022.0869

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Abstract In order to study the change of blasting damage range and fragmentation distribution of single free face rock，firstly，the reflection law of explosion stress wave on single free surface was studied by optical refraction Snell law，and the bottom radius of blasting crater was determined. Then，combined with the field blasting crater experiment of Baima iron mine，the geometric characteristics and rock fragment size of blasting crater under different burial depths and weights of explosive packet were analyzed. And the continuous-discontinuous element method(CDEM) was used to simulate the morphological characteristics of blasting crater and rock fragment size. The results show that the blasting crater volume under unit explosive weight increases in the power type of explosive packet ratio weight，and raises first and then reduces with the grow of the explosive ratio burial depth. There is a maximum point when the ratio buried depth is 1.01. The fragmentation of blasting crater narrows with the increment of the charge weight，and expends with the growth of the charge buried depth. The average particle size of broken rock decreases with −19/30 power of the charge weight，and increases with 1.42 power of the charge buried depth. Finally，using the verified numerical simulation method，the rock breaking effect of blasting design with the large hole distance and small resistance line at the Xia?an creek in the Three Gorges Project was reproduced. It provides reference for analysis and prediction of rock blasting fragmentation in practical engineering.

Key words： rock mechanics blasting crater crater bottom radius explosive package weight explosive package burial depth fragment-size

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	Articles by authors
	FAN Yong1
	2
	WU Jingao1
	2
	LENG Zhendong1
	2
	YANG Guangdong1
	2
	CUI Xianze1
	2
	GAO Qidong1
	3

Cite this article:

FAN Yong1,2,WU Jingao1, et al. Experiment and simulation of rock fragmentation size of blasting crater#br#[J]. , 2023, 42(9): 2125-2139.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0869 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I9/2125

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