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本文利用GDS动态循环三轴仪施加竖向循环荷载对武汉地区具有代表性的老黏土进行试验研究,主要分析了老黏土在模拟地铁振动荷载作用下的动力特性。通过对孔隙水压力变化和残余应变发展曲线的分析,探讨了下不同固结比、动应力比、卸荷比等因素对老黏土动力特性的影响,并综合各因素总结出老黏土的动力响应规律;通过与软粘土和淤泥质土的已有研究成果进行对比分析与讨论,提出了合适老黏土的孔隙水压力发展模型及残余应变经验公式。本文的研究对地下工程设计中认识老黏土的物理力学特性等具有一定意义。
In this paper, the GDS dynamic cyclic triaxial apparatus is applied to exert vertical cyclic loading to test and study the representative old clay in Wuhan. The dynamic characteristics of the old clay under the simulated subway vibration load are mainly analyzed. Based on the analysis of pore water pressure and residual strain curve, the influences of different consolidation ratio, dynamic stress ratio and unloading ratio on the dynamic characteristics of old clay were discussed. The dynamic response of old clay was summarized based on various factors Through the comparative analysis and discussion with the existing research results of soft clay and silt soil, the pore water pressure development model and residual strain empirical formula of suitable old clay are proposed. The research in this paper is of some significance for understanding the physical and mechanical properties of old clay in underground engineering design.