Experimental Analysis Of The Influence Of Coarse Particles In Soft Soil On Rheological Properties

Soft soil under natural conditions usual y has a high water content and poor permeabilit y and compression characteristics of large,often encountered in foundation deformation and stability of the engineering construction in soft soil area,the soft soil composition is complex,which makes the deformation and stability of soft soil has become the urgent need to solve two major difficulties problems in engineering.The soft soil is widely distributed in China,beach,lake,Delta area were distributed,and economic growth also accelerated the rapid development of basic construction,greatly improve the social demand for land,which leads to the original is not suitable for soft soil bearing also has a very high economic value.Therefore,it is of great significance to study the rheological mechanism of soil and master the law of rheology,and to guide the enginee r ing practice and promote the development of the society.In this paper,bentonite and quartz sand configuration of the artificial soil as the research sample,using a combination of theoretical and experimental methods,explore the influe nce of matrix and particle physics state on the rheology of soil reinforcement in soft soil;and combined with the test data to interpretation of soil rheology from "streamline" perspective.The main achievements of the research work in this paper are as follows:(1)The influence of particle size,body ratio and matrix liquid index on the rheological properties of soil in soft soil was studied.Through direct shear creep test showed that the average viscosity coefficient of soft soil increases with the increase of particle volume fraction and matrix liquid index increased with coarse particle size decreases;the creep threshold stress increased with particle volume fraction increases with coarse particle size and matrix liquid refers to the increase of number of reduced.(2)The introduction of four element model with nonlinear elastic modulus H-(H1?N1?V1)of test data fitting.The results show that the model has a higher agreement on the rheological behavior of soil,but the model simulation is not accurate when the soil rheologic a l nonlinear level is raised.Through the discussion of the model parameters,the relations hip between the particle ratio,the particle size and the matrix liquid index and the creep parameters is also obtained.The results are in agreement with the direct shear creep test(3)The rheology model of soil rheology is preliminarily presented and verified,and the average viscosity coefficient of soil is exponentially related to the length of streamline.According to the model,it is deduced that the length of the particle streamline decreases with the increase of the volume ratio,and the total creep line length of the soil increases with the increase of the volume ratio,and then the creep threshold stress increases with the increase of the volume ratio.