爆破作用下露天矿边坡动态稳定性
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摘要
以归来庄深凹露天金矿为工程实例,采用FLAC和强度折减法,得出边坡在静力条件下的安全系数.针对不同折减系数下的边坡计算方案,在坑底施加爆破动载荷.将加卸载响应比理论引入边坡动力稳定分析研究中,建立边坡在爆破作用下的加卸载响应模型.以爆破振动速度的周期性变化作为加载量,以边坡特征点的相应速率作为响应参数,进而确定在爆破载荷作用期间的边坡加卸载响应比.计算结果表明:在爆破载荷作用后,不同的边坡稳定状态表现出不同的加卸载响应比特征;在边坡失稳前,加卸载响应比呈现持续增长的特点,说明以加卸载响应比作为爆破边坡稳定性的判断依据是可行的.
Based on the conditions of deep open pit of Guilaizhuang gold mine,the static safety factors of open pit slope were obtained by the FLAC software according to the principle of the strength reduction method.The explosive loading was imposed on the open pit bottom to analyze the dynamic stability of the slope under different reduction factor.The theory of load-unload response ratio(LURR) was introduced to establish a load-unload response model of slope under blast loading.The periodical variation of blasting vibration velocity was regarded as loading parameter,and the velocity of characteristic point was regarded as response parameter to determine the LURR of slope under blasting loading.It was found that the LURR under blast loading can reflect the different slope stability state,and the LURR increases gradually as the slope approaching instability.Therefore,LURR is regarded as a very effective nonlinear dynamic analysis method to judge slope stability.
Based on the conditions of deep open pit of Guilaizhuang gold mine,the static safety factors of open pit slope were obtained by the FLAC software according to the principle of the strength reduction method.The explosive loading was imposed on the open pit bottom to analyze the dynamic stability of the slope under different reduction factor.The theory of load-unload response ratio(LURR) was introduced to establish a load-unload response model of slope under blast loading.The periodical variation of blasting vibration velocity was regarded as loading parameter,and the velocity of characteristic point was regarded as response parameter to determine the LURR of slope under blasting loading.It was found that the LURR under blast loading can reflect the different slope stability state,and the LURR increases gradually as the slope approaching instability.Therefore,LURR is regarded as a very effective nonlinear dynamic analysis method to judge slope stability.
引文
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[6]Singh P K.Blast vibration damage to underground coal minesfrom adjacent open-pit blasting[J].International Journal ofRock Mechanics and Mining Sciences,2002,39:959-973.
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[8]Korichi T,Bachir B.Design of a model blasting system tomeasure peak P-wave stress[J].Soil Dynamics andEarthquake Engineering,2003,23(4):513-519.
[9]Itasca Consulting Group Inc.FLAC3D(fast Lagranginananalysis of continua in3dimensions)(version3.0)[M].Minneapolis:Itasca Consulting Group Inc,2005.
[10]Zheng Y R,Tang X S,Zhao S Y,et al.Strength reductionand step-loading finite element approaches in geotechnicalengineering[J].Journal of Rock Mechanics andGeotechnical Engineering,2009,1(1):21-30.
[2]姜彤,马莎,许兵,等.边坡在地震作用下的加卸载响应规律研究[J].岩石力学与工程学报,2004,23(22):3803-3807.(Jiang Tong,Ma Sha,Xu Bing,et al.Study on laws ofload-unload response of slope under seismic load[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(22):3803-3807.)
[3]尹祥础,陈学忠,宋治平,等.加卸载响应比:一种新的地震预报方法[J].地球物理学报,1994,37(6):767-775.(Yin Xiang-chu,Chen Xue-zhong,Song Zh-iping,et al.The load-unload response ratio theory:a new approach toearthquake prediction[J].Acta Geophysica Sinica,1994,37(6):767-775.)
[4]Yin X C,Chen X Z,Song Z P,et al.A new approach toearthquake prediction:the loading/unloading response ratio(LURR)theory[J].Pageoph,1995,145(3/4):701-715.
[5]Yin X C,Yin C.The precursor of instability for nonlinearsystems and its application to the earthquake predication[J].Science in China B,1991,38(2):977-986.
[6]Singh P K.Blast vibration damage to underground coal minesfrom adjacent open-pit blasting[J].International Journal ofRock Mechanics and Mining Sciences,2002,39:959-973.
[7]Jacob N.Scaling aspects of quadrangular plates subjected tolocalised blast loads-experiments and predictions[J].International Journal of Impact Engineering,2004,30(8/9):1179-1208.
[8]Korichi T,Bachir B.Design of a model blasting system tomeasure peak P-wave stress[J].Soil Dynamics andEarthquake Engineering,2003,23(4):513-519.
[9]Itasca Consulting Group Inc.FLAC3D(fast Lagranginananalysis of continua in3dimensions)(version3.0)[M].Minneapolis:Itasca Consulting Group Inc,2005.
[10]Zheng Y R,Tang X S,Zhao S Y,et al.Strength reductionand step-loading finite element approaches in geotechnicalengineering[J].Journal of Rock Mechanics andGeotechnical Engineering,2009,1(1):21-30.
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