摘要
通过对白水峪水电站坝区爆破振动试验数据的回归分析，获得了施工爆破处的振动衰减规律，给出了在爆破施工期间，爆区附近的残留岩体稳定所能使用的最大药量。爆破产生的岩石质点振动为随机振动过程，其能量集中在２５ ～３０ Ｈｚ 频率范围内，比天然地震波主频高得多，爆破产生的振动不会引起基岩的共振。残留岩体的临界振动速度直接关系到残留岩体的稳定性。根据试验实测地点宏观调查结果及相关规范，将残留岩体的临界质点振动速度控制在３ ．５ ｃｍ／ｓ 以下，就能保证残留岩体的稳定性。
Through the regression analysis of the datum obtained from the blast and vibration experiment at Baishuiyun Hydroelectric Station, the construction blast region is obtained and the maximum loading that can be used for the stability of the remnant rock mass is given at the blast area. Because the blasts major frequency is much higher than the natural earthquake wave, the blasts vibration can not incur the resonance of foundation rock mass. The critical vibration velocity of the remnant rock mass is directly related to the stability of the remnant rock mass. Based on the macroscopic investigation result of the experiment on the spot and relevant standards, the stability of the remnant rock mass can be guaranteed when the critical vibration velocity of the remnant rock mass is under 3.5 cm/s.
关键词
爆破振动
质点峰值振速
残留岩体
最大药量
blast and vibration
crest value vibration velocity of partials
remnant rock mass
