Research Of Blasting Excavation Vibration Impact On Governance Of Oversize Dangerous Rock Mass

With the accelerating process of western development,engineering disasters are triggered increasingly,among all of the disasters,collapse of dangerous rock accounted for the large proportion,especially in high altitude area in Southwest.In this paper,engineering geological characteristics of dangerous rock are traversed taking the Zhenzi Yan project in Jinfo Mountain which located in Nanchuan district in Chongqing city as an example,blasting vibration field test that lasting about three months are designed according to Construction progress needs and security requirements.Dangerous rock management plan is optimized through the data feedback of vibration velocity monitoring and displacement monitoring.FLAC3 D software is adopted to make stability analysis and construction scheme of dangerous rock are optimized.The main contents of research are as follows:?The analysis of characteristics and stability influence factors of Zhenzi Yan dangerous rock body is based on geological survey data,the development process,formation mechanism and instability mode of the dangerous rock body is evaluated,mechanical model that conforms to reality is established,the instability model is judged as whole slipping shearing destruction pattern.? The stepped sloping clear and closed relaxed fissures greening governance scheme is combined with the features of governance and safety requirements of dangerous rock mass,and the excavation blasting field test is made.Reasonable blasting scheme is set through the data feedback of blasting vibration detection and displacement monitoring;Safety construction measurements are proposed according to the characteristics of oversize dangerous rock mass blast working and a comparatively perfect supervision and control system is established.?The numerical simulation software FLAC3 D is used to establish calculation model of ZhenZi Yan dangerous rock mass,different dosage corresponding blast loading capacity is loaded to analysis the dynamic response under blast loading,the variation tendency between safety factor and blast vibration is also calculated.Desirable safety coefficient 1.10 corresponding single dose of 59.2 kg is confirmed as quantity control of blasting construction.Site blasting experiment is certificated,the requirement of security and governance construction progress can be satisfied,and a better blasting effect can be obtained.? since the vibration velocity of area near blasting source is not easy to get,the blasting vibration velocity of certain measuring point in dangerous rock mass is treated as control standard of stability monitoring.according to calculation result,20 m from explodes while blasting vibration velocity values about 10 cm/s is set as control standard,location of the monitoring and control standards is clear and reference for the blasting construction control is more practicality in engineering.