摘要
根据某抽水蓄能电站地下厂房洞室群爆破开挖施工实例,应用动态有限元程序,采用ALE算法和Lagrange算法相耦合,建立简化模型,用集中装药代替实际的分散装药,模拟研究洞室的应力场和速度场特点,分析爆破震动对既有洞室的影响因素。结果表明,水平速度明显高于垂直速度,临近爆源的隧道直墙上部周边振动速度最大,且出现多次峰值。应力最大值分布规律表明迎爆侧和背爆侧的受力特点完全不同。模拟结果与现场测试数据基本吻合。
According to the engineering practice in Tai＇an Pump-water Harbor Power Station Underground Chamber Grounds Blasting Excavation Disaster Prevention and Prediction Project, the influencing factor of blasting seismic on the existing chamber is analyzed by simulating the stress field and velocity field of the chamber with the simplified model built with the dynamic finite element program and arithmetic coupled ALE and Lagrange and substitution of the centralized charge for disperse charge. The results show that the level velocity is higher than vertical velocity, and the biggest velocity locates at the top part of the frontal wall and the peak value appears many times. It is indicated by the distribution law of the biggest stress that the stress is completely different from each other on both sides of the chamber. The simulating results are well consonant with the spot test data.
出处
《有色金属》
CAS
CSCD
北大核心
2008年第1期101-104,共4页
Nonferrous Metals
关键词
爆破工程
既有洞室
数值模拟
地下工程
防震减灾
blasting engineering
existing chamber
numerical simulation
underground engineering
quake preparedness and disaster mitigation
