爆破荷载作用下岩体振动特征的数值模拟  

Udec modeling of vibration characteristics of jointed rock mass under explosion

作　　者：夏祥[1] 李俊如[1] 李海波[1] 刘亚群[1] 周青春[1] 

机构地区：[1]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《岩土力学》2005年第1期50-56,共7页Rock and Soil Mechanics

基　　金：国家重点基础发展规划项目(2002CB412705);国家自然科学基金(50374063;50009008)资助项目

摘　　要：根据福建牛头山水电站地基岩体爆破开挖监测,运用离散元方法模拟了节理岩体距爆源不同距离处质点的振动速度和频率的变化特征,由此确定岩体质点最大振动速度和振动主频随爆源距离的衰减规律,并得到了距爆源一定距离处质点最大振动速度和振动主频与爆破药量的关系。数值模拟与现场实测的结果表明,用离散元软件 UDEC 计算得到的岩体振动特征和衰减规律与现场监测结果是基本符合的,误差在工程应用的允许范围之内,因此 UDEC 用于对岩体动态响应的数值模拟是适合的。Five blasting tests are carried out in Niutoushan hydraulic engineering project, Fujian province, east China. The vibration velocity of jointed rock mass under explosion is simulated by the discrete element program UDEC. And the attenuation characteristics of the peak particle velocity and particle oscillation frequency are obtained. In succession the inputting explosion loads of the numerical model are modified according to the charge weight alterations in each blasting test. Thus the relationship between the peak particle velocity and the charge weight is acquirable when the distance between the monitoring point and the charge hole keeps constant. Also the variation of the particle vibration frequency with charge weight is known in the same way. It is observed that numerical modeling results, on the whole, agree well with those of the field tests. For this case, UDEC is applicable to simulate the dynamic response of jointed rock mass subject to explosion.

关 键 词：离散元法 数值模拟 速度衰减规律 UDEC 岩体爆破 水利工程 

分 类 号：TV542[水利工程—水利水电工程]