爆炸荷载作用下岩体振动特性的DE-FLAC^(3D)数值模拟方法  

Modeling the Vibration Characteristics of Rock Mass Under Explosion Load Using DE-FLAC^(3D) Numerical Method

作　　者：苏国韶[1,2] 张小飞[1] 符兴义[1] 陈光强[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《北京理工大学学报》2009年第6期471-474,共4页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(50809017);中国博士后科学基金(20080440812);岩土力学与工程国家重点实验室开放基金项目(Z110601)

摘　　要：针对岩体爆炸数值模拟中爆炸荷载参数与岩体振动阻尼参数等计算参数难以确定的问题,将具有收敛速度快、易于实现和全局寻优能力强等优点的差分进化算法(differential evolution,DE)算法融入三维快速拉格朗日差分法(FLAC3D)岩土工程数值计算程序,提出了爆炸荷载作用下岩体振动特性的DE-FLAC3D数值模拟方法.该方法从爆炸荷载参数和岩体振动阻尼参数的随机值出发,以岩体质点振动速度随时间变化过程的数值计算值与现场实测值的误差作为适应度,利用DE算法规则实现爆炸荷载参数和岩体振动阻尼参数耦合模式的合理进化,进而实现计算参数的快速自适应辨识.龙滩水电站地下厂房爆炸开挖振动试验数值模拟研究结果表明,该方法是可行的,显著提高了岩体爆炸效应数值模拟结果的精度.A new method namely DE-FLAC^3D based on differential evolution（DE） and combined with FLAC^3D, is proposed for the identification of the global optimum parameters. DE algorithm is a newly developed global optimization technique with excellent performance and simple to implement. At first, stochastic parameters are initialized, difference in particle velocity between the numerical results and in-situ measurements is regarded as fitness value to evaluate quality of the parameters. Then, the parameters are updated continually using DE rule until the optimal parameters are found. Thus the parameters are identified adaptively during a back analysis process. Results of applications to blasting test in Longtan showed that the method is feasible and efficient. The method can improve the precision significantly for numerical simulation in vibration characteristics of rock mass under explosion load.

关 键 词：爆炸荷载 岩体振动 数值模拟 差分进化算法 三维快速拉格朗日差分法(FLAC3D) 

分 类 号：TV731[水利工程—水利水电工程]