Effect of the Rock Blasting Sequence on Buildings Adjacent to the Hehui Expressway

Abstract

The cutting blasting project of the Hehui Expressway is close to existing buildings. Vibration reduction measures based on a fine blasting design are put forward to ensure the safety of the project and existing buildings. The project is divided into three blasting areas for construction. This paper investigates “first middle and then edge” and “first edge and then middle” blasting sequences and the vibration responses of adjacent buildings. For the cutting blasting project of the Hehui Expressway, the different blasting sequences are investigated according to the positional relationship between three blasting areas and an existing village, and a reasonable blasting sequence is determined through numerical simulation, on-site blasting tests, and the on-site vibration response data of adjacent buildings. The results show that the existing buildings can be effectively protected by changing the construction sequence of the blasting area on the premise of ensuring the effectiveness and safety of construction. Zone II can be regarded as a huge blasting isolation hole that plays a positive role in the control and attenuation of the blasting stress wave. Blasting in Zone II thus has an excellent vibration reduction effect exceeding 90%. With the adoption of the “first middle and then side” construction sequence, the maximum particle velocity of existing buildings under the action of the blasting stress wave is 1.1 cm/s, which is within a reasonable safety range.