地铁荷载下隧道周围加固软黏土应变累积特性

通过对上海地铁四号线海伦路站附近隧道周围加同软黏土进行应力控制的循环三轴试验,研究了列车循环荷载作用下加固软黏土的累积变形特性.充分考虑土体围压、固结比、轴向循环压力的大小及频率的影响,得到了加固软黏土在各个因素综合影响下的残余应变的变化规律.通过研究发现,可以用对数关系曲线来描述加固软黏土残余应变随振动次数的变化情况...

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

Through the dynamic triaxial tests of the reinforced soft clay around the tunnel near the Hailun Road station of Shanghai Metro Line 4,the accumulated deformation properties analysis is made on the reinforced soft clay under subway vibrational loading, and the influence of the confining pressure of soils,consolidation ratio,cyclic loading amplitudes,vibration frequency are taken into account. and the variation law of residual strain with cyclic numbers,consolidation status, cyclic loading amplitudes and vibration frequency was obtained,it is considered that the relationship between residual strain and cyclic numbers could be forecasted by logarithmic relationship curve.Besides,the parameters of the prediction model about every factor was studied based on regression analysis.The research in this paper is 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 vibrational Loading.