RESEARCH ON THE APPLICATION OF TUNNEL CONTROLLED BLASTING CONSTRUCTION TECHNOLOGY IN THE AREA NEAR CIVILIAN HOUSING CONCENTRATION
In view of the disturbance caused to buildings by tunnel drilling and blasting construction blasting in nearby concentrated areas of civil houses,a study on tunnel controlled blasting technology was carried out from two aspects of blasting parameters and vibration control measures 7 civil houses in the explosion area were selected for monitoring,and combined with the actual situation on site,the safe permissible vibration speed of civil houses was determined to be 0.5cm/s.The warning value is 80％of the safe allowable vibration speed,and the relationship between the distance between the explosion area and the protected object and the control charge of a single sound is calculated.The peak vibration velocity of adjacent buildings,deformation in tunnel and surface settlement were monitored on site,and the results showed as follow:In the peak vibration velocity monitoring,more than 75％of the data is less than 0.5cm/s,and more than 95％of the data is less than 1.0cm/s.The site displacement monitoring results meet the construction management control standards,and finally verify that the blasting technology can minimize the impact of blasting on the surrounding buildings(structures),and the tunnel structure is in a stable state.
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