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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摘要为研究单自由面岩石爆破破坏范围变化以及破碎块度分布规律，首先采用光学折射Snell定律研究爆炸应力波在单自由面的反射规律，进而确定爆破漏斗底半径；然后结合白马铁矿现场爆破漏斗实验，分析不同药包埋深和药包质量条件下爆破漏斗几何特征和岩石破碎块度大小；并采用连续‐非连续单元法(CDEM)模拟爆破漏斗形态和岩石破碎块度。研究结果表明：单位药包质量下的爆破漏斗体积以药包比值质量的幂函数型增大，并随药包比值埋深的增加呈现先增加后减小的规律，在比值埋深值为1.01时存在极大值点；爆破漏斗岩石破碎块度随药包质量的增加而减小，随药包埋深的增加而增大，破碎岩块的平均粒径以药包质量的－19/30次方减小，以药包埋深的1.42次方增大。最后，采用验证过的数值模拟方法，再现了三峡工程下岸溪料场宽孔距小抵抗线爆破设计破岩效果，为实际工程岩石爆破块度分析和预报提供参考。

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	范勇1
	2
	吴进高1
	2
	冷振东1
	2
	杨广栋1
	2
	崔先泽1
	2
	高启栋1
	3

关键词 ：岩石力学, 爆破漏斗, 漏斗底半径, 药包质量, 药包埋深, 块度

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

引用本文:

范勇1，2，吴进高1，2，冷振东1，2，杨广栋1，2，崔先泽1，2，高启栋1，3. 爆破漏斗岩石破碎块度实验与仿真[J]. 岩石力学与工程学报, 2023, 42(9): 2125-2139.
FAN Yong1，2，WU Jingao1，2，LENG Zhendong1，2，YANG Guangdong1，2，CUI Xianze1，2，GAO Qidong1，3. Experiment and simulation of rock fragmentation size of blasting crater#br#. , 2023, 42(9): 2125-2139.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0869 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I9/2125

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