Experimental Study On Consolidation Deformation Of Soft Soil Under Repeated Loading

The soft soil foundation has a long time of consolidation and settlement during the operation of the storage facility,and the settlement is relatively large,which results in the stability and safety of the upper building.During the operation of the storage facility,loading and unloading load on soft soil foundation approximates cyclic reversed loading,Taking the soft soil foundation under storage facilities as the research background and based on the laboratory consolidation test and finite element simulation,the deformation law of soft soil under cyclic reversed loading is studied in this work.In this paper,the one-dimensional consolidation theory of Terzaghi is firstly reviewed.Based on this theory,the analytical solution of one-dimensional consolidation of rectangular loads is derived.Secondly,according to the operation rules of storage facilities and combined with the characteristics of repeated loading,experiment on consolidation deformation of soft soil under repeated loading and static loads are carried out by using the modified consolidation test equipment.By the comparison of consolidation test results,the time effect of consolidation deformation of soft soil under repeated load ing and static loading is analyzed.In the repeated loading consolidation test,the consolidation deformation characteristics of soft soil are studied.The deformation laws of soft soil under different pre-loads,the period of repeated and increment ratio of repeated loading on consolidation deformation of soft soil,and compression coefficient,the void ratio with the number of repetitions are analyzed.In order to further study the settlement of soft soil foundation during the operation period of storage facilities under repeated loading,this paper takes the modified soft soil foundation of the Oil storage tank as an example,and uses the modified Cambridge model to associate ABAQUS finite element software with VISUAL STUDIO and FORTRAN to prepare DLOAD.The repeated load subroutine analyzes the characteristics of settlement,pore pressure dissipation,effective stress and void ratio during the soft soil foundation operation period of the storage facility.The results show that the results of numerical simulation using repeated loads are much more accurate for the settlement of soft soil foundations subjected to repeated loading of storage facilities.The repeated load and the storage facility load have similarities to a certain extent.Although they are not completely equivalent,after the pre-analysis of the storage facility type,reserves and storage period,the load type and size can be approximated to predict the long-term settlement.The development trend of pore pressure under repeated loading is fluctuating around zero.The effective stress increases with the increase of loading times.The results of the numerical simulation have practical engineering significance.