Characteristics of ground motion at permafrost sites along the Qinghai-Tibet railway

摘要

Based on 14 typical drilling holes distributed in the permafrost areas along the Qinghai-Tibet railway,the distribution of wave velocities of soils in the permafrost regions were determined. Using results of dynamic triaxial tests, the results of dynamic triaxiality test and time histories of ground motion acceleration in this area, characteristics of ground motion response were analyzed for these permafrost sites for time histories of ground accelerations with three exceedance probabilities (63%, 10% and 2%). The influence of ground temperature on the seismic displacement, velocity, acceleration and response spectrum on the surface of permafrost were also studied.