An Analytical Model For Compression Process And Its Engineering Applications Of Soils

The lateral confined compression models of soils is a significant basis of the analysis and computation of foundation settlement and soil deformation.At present,the simulation of deformation of lateral confined compressio n process of soils mainly includes numerical simulation based on microscopic analysis and analytical method based on macroscopic analysis.The former can fully reflect the micro-mechanics mechanism of soils deformation,but the method is actually inoperabl e or very difficult,resulting in less engineering application of the method.Therefore,the latter analytical method is favored by many scholars and engineers.However,the current soil lateral confined compression deformation of analytical model is not s atisfactory,so if we can establish a simple method which can fully reflect the stress path and stress history of soil deformation analysis of soil compression process model,for improving the analysis method of foundation settlement has important theoreti cal and practical significance in engineering,which is also the research content of this paper.Firstly,from the in-depth study of the mechanical mechanism and macroscopic deformation characteristics of the lateral confined compression deformation of soi ls,a macroscopic soil is abstracted as two portions of ideal materials according to the general features that the total macroscopic deformation of soils can be divided into mesoscopic unrecoverable and recoverable elastic deformation.One is called as a mesoscopic ideal void material which can describe the unrecoverable deformation behavior,another is called as a mesoscopic ideal porous skeleton material which can describe the recoverable and elastic deformation behavior,then a analytical model of the macroscopic deformation of soils is established which can distinguish mesoscopic unrecoverable and recoverable elastic deformation.Afterwards,the analytical models for lateral confined initial compression of soils is developed by separately discussing the mesoscopic deformation analysis methods of mesoscopic ideal void and porous skeleton materials,and the corresponding methods for determining the parameters of these models are also proposed.Then,considering that the essential difference between the init ial compression and unloading rebound and recompression process of soils is the change of the deformation law of the material which is the unrecoverable part of the soil,that is,the material of the void,therefore,based on the initial compression model of soil,The process of unloading and recompression of soils after consolidation stress was studied.Based on the calculation method of unrecoverable strain,an analytical model of unloading resilience of soil was established,and then the initial void rat io and compressibility parameter,the analytical model of lateral confined recompression is established,which can fully reflect the influence of stress path and stress history on soil deformation.Finally,on the one hand,through the lateral confined compression test of soil,the test curves are compared with the existing model curves of the similar kind,which shows the rationality of this model.On the other hand,this paper established the compression process of soil analysis model is applied to the fo undation settlement calculation of layered summation method,analyses the practical engineering of foundation settlement,which shows the practical of this model.