Construction Technology of Bedrock Mark for Ground Subsidence Monitoring in Zhengzhou

Abstract:

According to the regional geological conditions, Zhengzhou Ground Subsidence Monitoring Network decided the building site with the setting depth of 732m. The geological identification hole is 780m in depth with 108mm in diameter, full hole coring drilling, the construction focuses on the core recovery, rotary drilling is adopted with mud protection, and according to the lithology in different drilling horizons, various mud are prepared. The bedrock mark hole is 780m in depth with 311mm in diameter, the construction focuses on the borehole quality and verticality, full face drilling technology is adopted with three-cone bit and pagoda type BHA, good construction quality is achieved.