Research On Deformation Mechanism Of Soft Ground Under Low-frequency Cyclic Loading

In recent years,with the rapid economic development,more and more storage facilities are built on soft soil,and its foundation is subjected to typical low-frequency cyclic loading during operation.Soft soil has the characteristics of large porosity ratio,high water content,and high compressibility,which leads to problems such as large deformation of the soft ground under low-frequency cyclic loading,long settlement time,uneven settlement and difficulty in prediction,etc.damage.Understanding the deformation mechanism of soft ground under low-frequency cyclic loading can effectively prevent the destruction of the superstructure caused by the deformation of the foundation.Based on the research background of soft soil foundation deformation during the operation of storage facilities,this paper studies the deformation mechanism of soft soil foundation under low-frequency cyclic load through three aspects: consolidation theory analysis,indoor cyclic load test and ABAQUS simulation and theoretical comparison based on engineering examples.Firstly,MATLAB is used to program and calculate the analytical solutions of pore pressure,settlement and consolidation degree,and the theoretical solution is used to study the macroscopic deformation mechanism of soft ground under low-frequency cyclic loading,such as pore pressure,settlement,Consolidation degree,effective stress and other changes;analyze and determine the factors that affect the deformation of the soft ground under low-frequency cyclic loading,such as load type,load loading\standby\vacant time,consolidation coefficient,cyclic load,load period,The theoretical calculation of the required drainage distance;finally change the parameters of a certain factor,keep the parameters of the other factors unchanged,analyze the specific impact of a certain factor on the macroscopic deformation of the soft ground,and compare the deformation of the foundation under static load.Simulate the effect of soft ground under low-frequency cyclic load through indoor cyclic loading/ unloading test,and study the difference between low-frequency cyclic load and static load under long-term action;cyclic load,load period,historical stress,effective load ratio,etc.,deform the soft soil The influence of the influence ofthe analog objects on the vertical deformation of the soft ground under low-frequency cyclic loading is analyzed.The deformation characteristics of the soft ground under low-frequency cyclic loading and the changes of the physical properties of the soft soil are analyzed.Finally,the ABAQUS simulation values based on engineering examples are compared with the measured and theoretical values to analyze the changes of pore pressure,settlement and consolidation degree of the soft ground under low-frequency cyclic loading;The change law of the foundation in terms of porosity ratio,stress-strain,etc.,and then to understand the deformation mechanism of soft ground under the action of low-frequency cyclic load,provide a reference for the design,construction and maintenance of the actual project.