露天矿边坡爆破振动破坏判据新方法及其应用

爆破振动危害动态应力比评价方法是根据爆破振动实地监测及质点振速预测方程，结合现场损伤破坏调查而求得岩土结构爆破振动破坏判据的一种新方法．该法综合爆破振动水平、岩体特征、现场条件及岩土支护系统等因素，可以较全面地反映岩土结构受爆破振动时的动态应力状态和损伤破坏程度．通过几个露天矿采场边坡的动态应力比评价，得出要保证露天矿边坡这种经常遭受爆破振动作用的整体性设施的安全，其动态应力比D

New method for determining blasting vibration damage criterion on open-pit slope and its application

According to monitoring of blasting vibration, the forecasting equations of particle vibration velocity and theinvestigation on slope in situ, the method based on dynamic stress ratio (DsR) for evaluating blasting vibration damage isa new way to get the criterion of rock and soil structure damaged and.destroyed. The method concerns many factors, in-eluding the blasting vibration level, the character of rock mass, the conditions in situ and rock-soil timbering system. Itcan be used to reflect roundly the dynamic stress states and damage of rock-soil structure induced by blasting vibration.Using this method for evaluating the damage on some open-pit slope in Anhui and Hubei provinces, the authors present anew blasting damage criteria for the open-pit slope often affected by the blasting vibration, and the critical value of DsRmust be less than 0.060 ± 0.008. To gain the dynamic stress ratio criteria, workers must monitor the particle velocity ofblasting vibration in situ first. At the same time, the conditions of rock and soil mass damaged and destroyed must be in-vestigated and noted in the scope of surveying points. Then, the attenuating vibration equation and the value of DsR arederived from the monitoring data and some parameters. At last, based on the one-to-one correspondence relation betweenthe value of DsR and the classification of the conditions of rock and soil damaged and destroyed, the critical value of DsRis the final criterion of damage and destroy induced by blasting vibration