【摘要】 通过现场爆破振动测试和数值模拟方法研究地下厂房爆破损伤范围及判据;在应用FLAC3D数值模拟软件中,损伤变量D被引入弹塑性本构模型,同时将简化的三角形荷载作为爆破冲击荷载施加在炮孔孔壁上,并根据岩石中有效应力确定爆破损伤范围。调整同时起爆炮孔数目,改变单段起爆药量,研究爆破损伤范围与单段药量的关系,结果表明:损伤深度和损伤水平半径均随单段药量的增加而增大,损伤范围随着炮孔深度增加而减小,爆破损伤最大水平半径出现在炮孔顶部面上。根据爆破近区质点速度衰减规律,并通过数据拟合得到对应于不同单段起爆药量的最大损伤水平半径和相应部位爆破质点临界损伤振动速度的关系,临界损伤振动速度可作为爆破损伤安全判据。研究成果有效地应用到实践中,对类似开挖爆破工程具有一定指导意义。更多还原

【Abstract】 Criterion and damage zone induced by excavation blasting of underground power-house were studied by field test of blasting vibration and numerical simulation.The numerical simulation software FLAC3D was adopted with introducing damage variable D into elastoplastic constitutive model.The simplified triangular load was used as blasting load on the wall of blast hole.The blasting-induced damage zone was defined according to effective stress of rock.By revising the number of blast holes,the maximum quantity of explosive charge of single-stage priming was changed to study its relationship with blasting-induced damage zone.The results of numerical simulation show that the depth and the horizontal radius of damage zone increase with the increment of explosive charge of single-stage priming while the damage zone reduces with the increment of depth of blast hole.The maximum horizontal radius of damage zone is at the surface of the top of blast hole.According to the attenuation of particle velocity in the area near blasting source,the relationship between the maximum horizontal radius of damage zone and the critical vibration velocity for blasting-induced damage was obtained by numerical data fitting corresponding to the change in explosive charge of single-stage priming.The critical vibration velocity for blasting-induced damage was used as damage safety criterion of blasting.The study results can be used effectively in practice and have guiding significance for those similar blasting projects.更多还原