考虑应力历史的双层地基一维固结问题

基于单层超固结饱和土固结理论，针对不同排水条件、变荷载和自重应力沿深度实际分布及考虑应力历史影响的双层地基固结问题，提出了相应的一维固结方程，并利用半解析法编制了求解该问题的Fortran程序ODLCADOS.通过典型的算例，揭示了考虑应力历史影响的双层地基一维线性固结性状.研究表明，考虑应力历史影响比未考虑应力历史影响时，地基沉降小，固结发展快；荷载的大小、上下土层先期固结压力、土体压缩性和渗透性的变化等对双层地基的固结性状均有明显影响.

One-dimensional consolidation theory of double-layered soil considering effects of stress history

Based on the consolidation theory of the single-layered over-consolidated soil,one-dimensional equations for linear consolidation of the double-layered soil were proposed considering effects of the stress history according to different drainage conditions,time dependent load and actual overburden pressure.And a corresponding computer program in Fortran language,which was called onedimensional linear consolidation analysis of double-layered over-consolidation soil(ODLCADOS),was developed by the semi-analytical method.Characteristics of one-dimensional linear consolidation of the double-layered soil taking account of effects of the stress history were illustrated by typical numerical examples.Results showed that the settlement is smaller and the rate of consolidation is greater than that of the one without considering effects of the stress history,and that the magnitude of load,the pre-consolidation pressure,variations of compressibility and permeability of the double-layered soil all significantly influence the consolidation behavior.