English：

Based on the demolition and reconstruction project of the floodgate of Tiangang Reservoir, theresearch of controlled blasting demolition technology with enhanced loosening and millisecond delay forfloodgates in environmentally sensitive reservoir areas is focused on. Through theoretical analysis, fieldtests, and monitoring data analysis, the impacts of factors such as borehole layout, charge design,blasting network, and safety protection on ground disturbance, existing buildings (structures) vibrations,shock waves, and flyrock were studied. Aiming at the super-long age, surface carbonized concrete andspecial environmental protection, the key technology of efficient blasting demolition of flood dischargesluice is formed, which realizes the collapse without flight of blasting block, the control of harmful effectssuch as vibration and shock wave, ensures the safety of surrounding buildings ( structures ) andfoundation, and achieves good demolition effect and resource utilization benefit.