爆破震动条件下露天矿止水幕墙稳定性研究
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摘要
探究爆破控制距离与爆破参数设计对露天矿地下止水幕墙的影响,确定科学合理的露天爆破方案,采用FLAC3D动力分析模块及傅里叶变换式震源模拟脉冲,模拟分析40,60,80m三种爆破控制距离及两种爆破方案对墙体质点振动速度的影响。研究结果表明,原有的爆破方案在60m爆破控制距离内对地下连续墙具有很大影响,质点振动速度超过安全允许值(2.9cm/s)323%。通过减小孔深、减少装药量、改变装药结构等方式优化调整爆破设计后,爆破控制距离在60m时,墙体质点振动速度为2.48cm/s,满足安全规程要求。基于优化的爆破设计采用孔内微差等控制爆破方式后,距墙体40m的爆破引起的墙体振动最大速度为2.83cm/s,能够保证露天矿爆破开采时地下连续墙的稳定。
The impact of blasting controlled distance and parameters design on underground diaphragm wall in open-pit mine was investigated,and a scientific and rational blasting solution was given.FLAC3 Ddynamic analysis modules and analogue pulse Fourier transform modules were used to simulate and analyze different effects on the blasting vibration velocity of diaphragm walls under three controlled blasting distances of 40 m,60 m and 80 m with two blasting programs.The results showed that the original blasting design had a harmful impact on the diaphragm wall in the controlled distance of 60 m,moreover,the particle velocity on the wall exceed 323% of the allowable value of the security(2.9cm/s).Therewith,by reducing the depth of the hole,decreasing the loading dose,changing the charging structure,and other ways,the blasting design was adjusted and optimized.Under the controlled distance of 60 m,the particle velocity on the wall was 2.48cm/s,which can meet the allowable value of the security.Based on the optimum blasting design and the in-hole millisecond blasting technology,the maximum particle velocity on the diaphragm wall was 2.38cm/s in the controlled distance of 40 m,which guaranteed the stability of the diaphragm wall during the open-pit mine's production.
The impact of blasting controlled distance and parameters design on underground diaphragm wall in open-pit mine was investigated,and a scientific and rational blasting solution was given.FLAC3 Ddynamic analysis modules and analogue pulse Fourier transform modules were used to simulate and analyze different effects on the blasting vibration velocity of diaphragm walls under three controlled blasting distances of 40 m,60 m and 80 m with two blasting programs.The results showed that the original blasting design had a harmful impact on the diaphragm wall in the controlled distance of 60 m,moreover,the particle velocity on the wall exceed 323% of the allowable value of the security(2.9cm/s).Therewith,by reducing the depth of the hole,decreasing the loading dose,changing the charging structure,and other ways,the blasting design was adjusted and optimized.Under the controlled distance of 60 m,the particle velocity on the wall was 2.48cm/s,which can meet the allowable value of the security.Based on the optimum blasting design and the in-hole millisecond blasting technology,the maximum particle velocity on the diaphragm wall was 2.38cm/s in the controlled distance of 40 m,which guaranteed the stability of the diaphragm wall during the open-pit mine's production.
引文
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[3]傅光明,任才清.露天采场台阶爆破震动传播规律及降震对策研究[J].采矿技术,2013,13(5):131-133.
[4]言志信,王永和,江平,等.爆破地震测试及建筑结构安全标准研究[J].岩石力学与工程学报,2003,22(11):1907-1911.
[5]闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2894-2899.
[6]刘亚群,李海波,赵坚,等.确定岩质边坡安全阈值的新方法[J].爆炸与冲击,2004(5):448-452.
[7]Group I C,Inc.FLAC3D(Fast Lagrangian Analysis of Continua in 3D)Version2.10,Users Manual[M].USA:Itasca Consulting Group,Inc,2002
[8]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.
[9]朱号锋,靳平,肖卫国.硬岩中地下爆炸震源函数的数值模拟[J].爆炸与冲击,2009,29(6):648-653.
[10]郭学彬,张继春.爆破工程[M].北京:人民交通出版社,2007.
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