小湾水电站地下厂房洞室围岩爆破震动的动力特征
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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.
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.
引文
〔1〕 王民寿、郭庆海 .用双随机变量回归改进爆破振速回归分析〔M〕 .爆炸与冲击 ,vol18No3 .1998.7.
〔2〕 王民寿 .控制爆破的理论和应用〔M〕 .台北 :台湾科技图书有限公司 ,1989年 8月 .
〔3〕 四川大学水电学院 ,等 .小湾超大型地下厂房洞室群合理施工顺序的研究〔A〕 .“九五”国家科技攻关子题项目内容 .
〔4〕 卢文波 ,等 .爆破地震波传播过程中衰减参数的确定〔M〕 .工程爆破 ,1997年第 4期
〔5〕 李海波、吴锦拔 .反应谱分析在确定动载析减系数中的应用〔M〕 .工程爆破 ,第 4卷第 2期 1998.6.
〔2〕 王民寿 .控制爆破的理论和应用〔M〕 .台北 :台湾科技图书有限公司 ,1989年 8月 .
〔3〕 四川大学水电学院 ,等 .小湾超大型地下厂房洞室群合理施工顺序的研究〔A〕 .“九五”国家科技攻关子题项目内容 .
〔4〕 卢文波 ,等 .爆破地震波传播过程中衰减参数的确定〔M〕 .工程爆破 ,1997年第 4期
〔5〕 李海波、吴锦拔 .反应谱分析在确定动载析减系数中的应用〔M〕 .工程爆破 ,第 4卷第 2期 1998.6.
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