Characteristics of Strain Accumulation of Reinforced Soft Clay Around Tunnel Under Subway Vibration Loading

Abstract:

Based on the dynamic triaxial tests of the reinforced soft clay around the tunnel nearby the Hailun Road station of Shanghai Metro Line 4,the characteristics of strain accumulation caused by subway vibration loading are explored by taking into account the influence of confining pressure,consolidation ratio,cyclic loading amplitudes and vibration frequency,and the change law of residual strain influenced by each factor is obtained.The logarithmic function form is adopted to describe the relationship between the residual strain and the vibration number.Besides,the model parameters are determined with the regression analysis.The research results are not only of great importance to the reinforcement of the soil around subway tunnels,but also of great theoretical value and practical meaning to the longterm settlement prediction of soft clay around tunnel under subway vibration loading.