钻孔爆破过程中顺倾边坡软弱夹层的运动力学模型  

Mechanical model of the motion for weak intercalation in layered rock slope induced by blasting

作　　者：宋小林[1,1] 张继春[1] 郭学彬[2] 肖正学[2] 

机构地区：[1]西南交通大学,成都610031 [2]西南科技大学,绵阳621002

出　　处：《应用力学学报》2010年第3期559-564,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50574076);中国博士后科学基金(20090451421)

摘　　要：针对顺倾边坡爆破时爆轰气体冲刷、压密软弱夹层而形成爆腔从而影响边坡稳定的问题,应用爆轰流体动力学和气液两相流理论,分析了在钻孔爆破过程中软弱夹层在爆轰气体作用下的压密和推移机理,建立了爆破过程中软弱夹层的运动力学模型,导出了爆腔在爆轰气体作用下的运动速度、最终半径和扩腔时间同装药参数和软弱夹层力学参数的定量关系。将该运动力学模型应用于两个典型实例的爆腔计算中,计算值与实测值的相对误差仅为4%左右,软弱夹层的运动速度随距炮孔中心距离的关系曲线也与试验曲线变化规律一致。Aimed at the stability analysis of layered rock slope influenced by the erosion, impulse, and compaction of the weak intercalation caused by blasting, the mechanism of the compaction of the weak intercalation induced by explosive gases during the blasting is studied with the theory of detonation fluid dynamics and two-phase flow theory of gas liquid. And the mechanical model of the motion for the weak intercalation is established. The quantitative relationship between the velocity of the weak intercalation, the final radius and the expansion time of blasting cavity and the parameters of charge, the mechanics parameters of the weak intercalation are deduced. The blasting cavity radius obtained from the model is compared with the measured results, which indicates that there are good correlations between the measured data and the calculated results, and the maximum deviation of both results is only 4.3%.

关 键 词：力学模型 爆腔 软弱层 爆破 顺倾边坡 

分 类 号：O383.1[理学—流体力学]