Dynamic characteristics anaIysis of moistening Ioess tunneI of Yintao water suppIy main channeI
Huang Xubin
Xu Jian
Abstract：In order to obtain the dynamic characteristics of tunnel in loess surrounding rock under seismic action after moistening,the seismic dynamics of the loess surrounding rock with moistening and tunnel structure had been ana-lyzed with the time-history method,basing on the relationship between initial elastic modulus,the shear strength parameters and the water content.The numerical computation results showed that,with the water content of the loess surrounding rock increasing,the absolute value of principal stress and the autooscillation circular frequency all decreased relatively,while the period of free vibration increased correspondingly.When the water content was less than its critical value,the peak acceleration of the tunnel roof was larger than the original seismic peak acceleration.Otherwise,it was opposite.Under the same water content,the maximum and minimum principal stress appeared alternately,making the tunnel lining material fatigue damage,which was the mainreason for the tunnel lining damage.The results can provide a reference for theseismic analysis on the different water content conditions of loess surroundingrock and tunnel structure.
Keywords：moisteningthe loess tunneltime-history analysiswater contentpeak accelerationprincipal stress
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 875-882 )