Journal of Engineering Research

In rock engineering, variations in lithological conditions significantly influence tunneling blasting efficiency. Through comparative experiments conducted under typical rock types including granite, limestone, and sandstone, this study systematically analyzed key indicators such as blasting parameters, block size distribution, charge utilization rate, and tunneling speed. Results indicate that hard brittle rocks exhibit characteristics of large blasted blocks and low tunneling efficiency post-blasting, while medium-hard rock types achieve optimal balance between energy transfer and rock fragmentation, demonstrating higher overall efficiency. Although soft rocks are easier to fracture, their lower energy consumption and charge utilization rates negatively impact construction cost-effectiveness. The research clarifies the regular patterns of blasting effectiveness under different lithological conditions, providing a reference for optimizing blasting parameters and selecting construction plans in engineering practice.

Lithological conditions; Tunneling blasting; Comparative experiments; Blasting efficiency