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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。
According to the results of on-site blasting vibration test, a prediction model of particle vibration of surrounding rock burst in Xiaowan underground powerhouse is established. According to the safety control standard of particle vibration velocity, the vibration safety distance of different dose explosions and the safe dose of determining the distance are determined. The high vibration speed and high frequency in the field test indicate that the rock mass of the project is relatively rigid and complete. Due to the anisotropy of surrounding rock lithology and structure, the anisotropy of blasting vibration is determined. Test results also show that the rock mass constraints have a scale effect. Small periphery, strong constraint, so that the knocking effect is enhanced, on the contrary, the vibration speed decreases, the frequency decreases.