Shaking Table Model Test on Portal Section of Mountain Tunnel in High Seismic Intensity Region

摘要

Based on Lebuguolaji tunnel in high seismic intensity region on Ya'an-Lugu expressway, a large-scale shaking table model test is conducted to study the seismic dynamic responses of the rock and tunnel structure in portal part. Similar material of surrounding rock is studied, acceleration and strain response of lining are analyzed in the condition of with absorbers and without them, indicating that absorption layer does not change the spectrum characteristics of lining but can weaken acceleration transmission and the dynamic interaction between soil and structure. The seismic cracks in tunnel surface are described and the reason is discussed. Research results provide references for aseismatic design and shock absorption design of tunnel in high seismic intensity region.