摘要
根据现场爆破震动测试成果 ,建立了小湾地下厂房围岩爆破质点振动的预测模型。根据质点振速的安全控制标准 ,确定了不同药量爆破的震动安全距离 ,以及确定距离的安全药量。现场测试振速大、频率高 ,说明该工程岩体较坚硬完整 ,由于围岩岩性和构造的各向异性 ,决定了爆破震动的各向异性。测试成果还表明 ,围岩约束具有尺度效应。小周边 ,强约束 ,使爆震效应增强 ,反之 ,则振速减小 ,频率降低。
The Xiaowan underground powerhouse surrounding rock blasting particle vibration prediction model was established on the basis of the site blasting shock test and measurement. The shocking safety distances for blasting with various charges and safe charge for specific distance are both determined according to the particle vibration velocity safety control standard. The high test vibration velocity and high frequency recorded at the site have proved that the rockmass of the project is rather sound. The anisotropy of blasting shock depends on the anisotropy of the surrounding rock properties and structure. The test results also indicate that the restraint of the surrounding rock has scale effect. Small periphery and intensive restraint enhance blasting effect, otherwise vibration velocity decreases and frequency reduces.
出处
《云南水力发电》
2001年第1期35-39,共5页
Yunnan Water Power
基金
"九五"国家科技攻关项目子题编号!( 96-2 2 1-0 5 -0 5 -0 3 )
关键词
地下厂房
围岩
爆破震动
动力约束
尺度效应
水电站
underground powerhouse
surrounding rock
blasting shock
dynamic effect
scale effect
anisotropy
