爆破漏斗岩石破碎块度实验与仿真  

Experiment and simulation of rock fragmentation size of blasting crater

作　　者：范勇 吴进高 冷振东 杨广栋 崔先泽 高启栋 FAN Yong;WU Jingao;LENG Zhendong;YANG Guangdong;CUI Xianze;GAO Qidong(Hubei Key Laboratory of Construction and Management in Hydropower Engineering,China Three Gorges University,Yichang,Hubei 443002,China;College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002,China;School of Highway,Chang'an University,Xi'an,Shaanxi 710064,China)

机构地区：[1]三峡大学湖北省水电工程施工与管理重点实验室,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002 [3]长安大学公路学院,陕西西安710064

出　　处：《岩石力学与工程学报》2023年第9期2125-2139,共15页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51979152);湖北省高等学校优秀中青年科技创新团队计划(T2020005);湖北省青年拔尖人才培养计划。

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。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.

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 

分 类 号：TU45[建筑科学—岩土工程]