Experimental Study On The Liquefaction Of Sandy Soil Sodium Silicate Curing

Sand is a kind of granular materials,widely exist in nature and often serve as a large number of engineering and construction of foundation,often will be affected by the earthquake load,such as traffic load,vibration load of different types of dynamic loads.For seismic load,A short-term shock load,The longitudinal wave and transverse wave in the earthquake will stress on soil unit,one of the most significant performance in earthquake damage is the phenomenon of sand liquefaction,results in the decrease of strength of the soil.And the influence of traffic load classes for sand soil is more complex,not only the vertical stress loop changes in the longitudinal stress will also be affected by the vibration.Mainly for the piling vibration load caused by vibration and impact in soil.These will cause huge economic loss and may threaten our life,so for soils under complex stress path dynamic and static characteristics of the study will help us control of the disaster has very important theoretical significance and practical value.Solid,liquid,gas is ubiquitous three-phase soil medium body,whose nature is relatively complex,of course,there are also two soil medium phase(saturated sand).Due to the dynamic stress exerted different then shown in the soil mechanics state will vary.For curing the main purpose of sandy soil is filling sandy soil in the middle of the pore,make not has the cohesive force of soil under the action of sodium silicate and calcium chloride to produce cohesive force to improve the strength and prevent the occurrence of liquefaction.After curing,the penetration coefficient of sand minimum order of magnitude 10-10 cm/s.For curing soil static and dynamic triaxial test are achieved the desired results: static triaxial strength,cohesive strength were increased,dynamic triaxial liquefaction resistance effect.The test sample used for fujian standard sand,for the pros and cons of calcium silicate and calcium chloride performance according to the length of time,the size of the baume degree,temperature of high and low to distinguish;Solidified soil permeability coefficient of initial solidified soil infiltration parameters was tested by GDS permeameter;Cured sand sample C,theta value and strength of the initial parameters of the sample by static triaxial instrument measurement;The dynamic strength and dynamic strain of solidified soil samples at the beginning of the sentence with the method of dynamic triaxial test the dynamic properties of solidified soil parameters areobtained.In this paper,the main research content mainly includes:1.In this paper,by analyzing the GDS system curing the permeability coefficient of sand specimen,thought that curing days,sodium silicate and calcium chloride mass ratio has much to do.Described according to the two important factors,through the seven group 31 sample penetrant test control,extract the data and the data were analyzed,the conclusion shows that after curing of sandy soil significantly lower permeability coefficient,the minimum can achieve an order of magnitude 10-10 cm/s.2.Maintenance to solidify sand specimen,3 days,a total of three sets of 9 samples on a static triaxial test,loading rate according to the specification requirements.Sample damage stress strain curve peaks,to the extraction of no peaks strain of 15%.Through the static triaxial test results show that the solidified soil sample of C,theta value associated with the mass ratio of sodium silicate and calcium chloride.In addition,the strength of the solidified soil specimens are also associated with the mass ratio of sodium silicate and calcium chloride.3.Dynamic triaxial dynamic load study of solidified soil sample cured sand sample residual strain and the analysis of the relationship curve of vibration time available,its damage type curing sand sample for cumulative strain increases with the increase of vibration frequency,for the damage type curing soil sample,the early damage type and solidified soil sample cumulative deformation,increases with the increase of vibration frequency,the late have a stable situation.according to test data analysis: pore pressure increases with the increase of vibration frequency,with the increase of vibration frequency gradually close to the confining pressure and pore pressure tends to be stable,but is unlikely to be confining pressure.