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本文依据土力学中已建立的基本概念,通过试验研究,首先找出正常固结粘土的渗透系数K与孔隙比e的关系,压缩系数a_V与孔隙比e或有效固结压力σ′的关系,从而推导出固结系数C_V与孔隙比或有效固结压力的关系表达式。分析不同土类固结系数的变化,归纳出三种典型的情况,即:C_V随e的减小而减小;C_V随e的减小而增大和C_V基本上与e无关。并指出特殊土类的C_V有特殊的变化规律。其次,分析了固结指数m变化的物理依据,讨论了m值与有效固结压力和上层厚度H的关系,最后,说明C_V和m变化的相互关系以及实用计算中应注意的问题。
Based on the basic concepts established in soil mechanics, this paper firstly finds out the relationship between the permeability coefficient K of the normally consolidated clay and the pore ratio e, and the relationship between the compression coefficient a_V and the pore ratio e or the effective consolidation pressure σ’. Therefore, the relationship between the coefficient of consolidation C_V and the void ratio or the effective consolidation pressure is deduced. Analysing the change of soil consolidation coefficient in different soils, we conclude three typical situations: C_V decreases with the decrease of e; C_V increases with the decrease of e and C_V is basically independent of e. And pointed out that special soil C_V has a special law of change. Secondly, the physical basis of the change of the consolidation index m is analyzed, and the relationship between the m value and the effective consolidation pressure and the thickness H of the upper layer is discussed. Finally, the relationship between the variation of C_V and m and the problems that should be paid attention to in the practical calculation are explained.