Stability Analysis of Connecting-tunnel Sealing Plug in Underground Storage Cavern

Abstract

Connecting tunnel sealing plug is one of the important structures in water sealed cavern. The plugs ensures the safety of main cavern and water seal effect. This paper uses the finite element software doing several calculation steps including geometry model, underground stress distribution, boundary condition and assumption, to analysis the connecting plugs and rock mass’ stability. On the basis of no-relative-slip assumption, it can reach the conclusion that the sealing plugs and rock mass are in safety conditions. Thus to make sure close and tight relation between plugs and rock mass, a variety of grouting measures are promoted and fulfilled.