Ultra-deep foundation pit blasting technology in thermal power plant under complex environment
In the face of the complex environment where the tight equipment in the factory area is operating normally and the blasting vibration speed is not greater than 0.5 m/s and amplitude is not greater than 120 μm,and the horizontal distance from the protected operating equipment is less than 8 m,the blasting point is lower than the foundation of the protected equipment,and there is a large amount of water accumulation in the nearby seaside hole,making static crushing impossible.In order to solve the blasting excavation of ultra deep foundation pits and hard rocks in pits,trenches,and platforms,a combination of"isolation resistance prevention,delay layering loosening"blasting technology and comprehensive,multi angle vibration reduction and anti flying safety measures are adopted.The one-time blasting excavation of foundation pits and trenches meets the design requirements,achieving the technical goal of maximum blasting amplitude not exceeding 110μm and blasting vibration velocity not exceeding 0.5 cm/s for adjacent structures and equipment facilities.Ensuring the safety of the factory and equipment,the rock fragmentation after the explosion is moderate,and improving operational efficiency.The research results can provide reference for deep excavation projects in similar complex environments.
foundation pit blastinglarge foundation pitcomplex environmentblasting vibration
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