Experimental Study On Treatment Of Soft Soil Foundation By Dynamic Loading Combined With Electroosmosis

Wenzhou soft clay can not meet the needs of site construction because of its high moisture content,high sensitivity and low permeability,and large engineering machinery can not enter the field directly.In order to solve this problem,electroosmotic treatment is often used,but due to the shortcomings of high energy consumption,electrode corrosion,large resistance between soil and electrode,high cost and so on,there are some limitations in the application of electroosmosis method in field construction.The treatment of soft clay by dynamic loading and electroosmosis can promote the discharge of moisture from the soil to a certain extent.Based on the above reasons,the experimental study on strengthening Wenzhou soft clay by dynamic loading and electroosmosis is carried out in this paper.It is of great significance to compare the method of dynamic loading combined electroosmosis with the method of pure electroosmosis for improving electroosmosis,but it is not possible to put forward some suggestions for field construction.The effect of dynamic loading combined electroosmosis is obviously better than that of electroosmosis alone.Dynamic loading can close the cracks of soil,make more electric energy used for drainage,improve the efficiency of electroosmosis,and can compress the pores in soil.In order to further study the influence of dynamic loading on electroosmosis,it is considered that the drainagespeed can be increased as much as possible,and the water content of soil after treatment can be reduced.The experimental study was carried out from the interval of dynamic loading,the starting time and the magnitude of exciting force.The starting time of dynamic loading is an important factor affecting the effect of electroosmosis,so an experimental study on one group of pure electroosmosis and five groups of different starting time was carried out on the basic of different starting time.The purpose of this paper is to study the effect of start-up time of dynamic loading on electroosmosis.The results show that the optimal reinforcement effect can be obtained when the starting time of dynamic loading is MCR=30% in terms of current,effective potential,shear strength and final water content of cross plate.The interval time of dynamic loading has an important influence on the experimental results.In order to study the effect of loading interval time on the experimental results and finally determine the best interval time,a group of pure electroosmosis tests and four groups of dynamic loading combined electroosmosis tests with different intervals were designed.The test results show that too long interval time is unfavorable to the increase of drainage efficiency,but too short interval time has no obvious increase in drainage capacity,and the consolidation effect of dynamic loading combined electroosmosis with interval time of 12 hours is the best.The magnitude of exciting force under dynamic loading is also a factor that can't be ignored for dynamic loading combined electroosmosis.In order to study the influence of exciting force on the test results and determine the best exciting force,a group of pure electroosmotic tests and five groups of dynamic loading combined electroosmosis tests with different excitation forces were designed.The experimental results showthat the effect of too small exciting force on the promotion of electroosmosis exists,but it is not obvious.When the exciting force increases to a certain extent,the effect of continuous increase of exciting force on electroosmotic consolidation does not change much,and the dynamic loading has the best effect on the consolidation of electroosmotic drainage when the exciting force is 10 KN.