Determination of Consolidation Constants by Use of Standard Oedometer Tests for the Purpose to Construct a New Constitutive Equation Taking Time effects into Consideration.

固结常数应用有效应力来定义。但由于没有孔隙水压力的测量。作为连续变化的指数，这些常量还没有根据有效应力来确定。为了克服这一障碍，本研究开发了一种人为改变试件顶面和底面孔压的新方法。利用这种新方法，有效应力分析已被证明甚至适用于阶跃加载类型的试验，并对以C_S和C_c为代表的压缩特性进行了精确检验。更重要的是。基于水压控制的思想，开发了一种新型的恒梯度固结试验方法，并根据连续变化的有效应力确定了更为可靠的压缩常数和渗透率系数k，为建立最新本构方程奠定了坚实的基础。

Consolidation constants should be defined by use of effective stress. However, because of no measurement of pore water pressure. the constants have not been determined in terms of effective stress as continuously changing indices. For the purpose to overcome this barrier, a new testing method artificially varying pore water pressures at the top and bottom surfaces of a specimen was developed in this study. By use of the new method, effective- stress analyses have been proved to be applicable even for step-loading type tests, arid compression behaviors represented by C_s and C_c have been precisely examined. Furthermore. a new type of constant-gradient consolidation test procedure was developed based on the idea of water pressure control, and the much more reliable compression constants as well as permeability behaviors represented by the coettiwent of permeability, k, have been determined in the terms of continuously changing effective stress.Based on the results stated above, a firm foundation on which the latest constitutive equation could be constituted has been obtained.