Bench Blasting Excavation Test for Multifault Foundation Pit of DG Hydropower Station

Abstract

A DG hydropower station is studied in a high-altitude area, where the air is thin and a fault fracture zone develops on the left and right banks of the dam foundation and riverbed dam section. To ensure the quality of the foundation pit blasting excavation and reduce the blasting disturbance to the surrounding unexcavated rock mass, a bench blasting excavation test is conducted on the dam foundation and the relaxation depth detection is adopted for the foundation rock blasting excavation. The average attenuation rate of acoustic wave velocity before and after blasting of all control points of rock mass meets the relevant standards and specifications, and the overall performance of excavation and cleaning is good. Test results show that reasonable blasting parameters are favorable for the formation of foundation excavation, and this technology can be used as a reference in similar projects.