Numerical Simulation Analysis On Mechanical Properties Of Foamed Mixture Lightweight Soil Using River Sludge

Due to the shortage of the earth’s resources and growing awareness of environment protection,the technologies of regenerating dredged sludge into geotechnical construction materials have received more and more attention internationally.One of these methods is to change the waste sludge into lightweight treated soil.The research object of this article,the foamed mixture lightweight soil using river sludge(FMLSS)is regenerated by mixing river sludge with cement and air foam.Some research shows that,this new geotechnical materials are light in self-weight,high strength,and they have the capacity of self-standing,what’s more,they are favorable to the protection of the environment.As a result,they will have good and extensive application prospect in engineering practice.But this research in our country is still in its infancy,there are a lot of content waiting for people to study.In this paper,on the basis of laboratory test,we studied the mechanical properties and damage mechanism of FMLSS by combining numerical simulation analysis.The main work is as follows:First of all,the various parameters of different ratio of FMLSS used in the numerical simulation were determined through laboratory test,after that,the finite element software ABAQUS was used to carry on the static and dynamic simulation on FMLSS sample model.then,we compared the simulation results with actual test and done further analysis of the simulation.The research shows that the numerical simulation results are in agreement with the actual test,at the same time,the different air foam content,cement content in FMLSS and loading ways will affect the strength and deformation characteristics.Secondly,Based on the mesoscopic characteristic of micropore distribution internal FMLSS,using physical mechanical experiments and numerical simulation,the correlation between FMLSS mechanical properties and micropore mesoscopic characteristic is studied to reveal the intensity of play and failure mechanism.According to the simulation and experiment measuring,the moisture content,air foam content and cement content are the important factors that affect micropore distribution internal FMLSS,and large diameter micropore and the uniformity of diameter distribution also largely affects the mechanics properties of FMLSS.Finally,we analyzed the factors that affects the structural property of FMLSS through consolidation test,and on the basis of Cam-Clay model,we modified its yield surface equation and stress-strain relationship by introducing parameters reflecting structural property combining FMLSS mechanical properties,the method to obtain the parameter of the improved model is also presented in this paper.