Interaction of shock waves with the linings of underground tunnels

Abstract

To develop trustworthy design methods and data for planning underground workings, water tunnels, and other long workings in ledge rock near blasting operations, extensive theoretical and experimental investigations are needed, in particular, on the diffraction of longitudinal waves in a deformed continuous medium.In this article, real ledge rocks are regarded as a homogeneous isotropic elastic or viscoelastic medium which acts in its linear range for low land levels.We studied the problem of plane diffraction of longitudinal waves (P-waves) about circular holes with the aid of plane homogeneous isotropic models made of an optically active material of the epoxy type with viscous friction, loaded in the linear region. We considered the dynamic problem for plane stresses, realized in thin models, forwhich