爆破作用下岩体顺倾软弱夹层的变形规律研究  

Study on Deformation Law of Down-dip Weak Intercalation in Rock under Blasting

作　　者：肖定军[1] 张继春[2] 蒲传金[1] 郭学彬[1] 

机构地区：[1]西南科技大学环境与资源学院,绵阳621010 [2]西南交通大学,成都610031

出　　处：《爆破》2010年第4期1-4,21,共5页Blasting

基　　金：国家自然科学基金项目(50574076);四川省教育厅科研项目(2004A129);西南科技大学实验技术研究项目(10syjs-21)

摘　　要：当炮孔穿过含顺倾软弱夹层边坡时,爆炸冲击波与爆生气体不可避免地对软弱夹层产生推移、使其变形。利用ANSYS/LS-DYNA建立含软弱夹层的顺倾岩质边坡台阶爆破的有限元模型,分析了抵抗线、夹层初始厚度、夹层倾角这3个主要因素条件下,爆破作用下岩体顺倾软弱夹层的变形规律:1)随着抵抗线的增加,爆腔范围也越来越大,其厚度也随之越变越厚;2)夹层初始厚度越薄,爆破后夹层厚度增加率越大,同时也越容易被推移;3)随着夹层倾角的增加,夹层厚度峰值也随着增加,但其最终夹层厚度随夹层倾角的增加而减小。When the borehole through the down dip slopes with weak intercalation,the blast shock wave and detonation gas inevitably lapsed and deformed the weak intercalation.The law of weak intercalation deformation was analyzed through the finite model of bench blasting in down dip rock slope with weak intercalation with ANSYS/LS-DYNA under the factors of the burden,the initial thickness and the angle of intercalation.The results show that the range of blast cavity and the thickness of intercalation are increased with the increase of burden;The thinner initial thickness of intercalation,the greater increasing rate of thickness and the weak intercalation easily deformed;the peak of thickness of intercalation increased with the increase of the angle of intercalation,but the final thickness of intercalation decreased with the increase of the angle of intercalation.

关 键 词：爆破 软弱夹层 变形 

分 类 号：TD235.1[矿业工程—矿井建设]