Study On Mechanical Properties Of Q₄^mcsoft Soil And Stabilized Cement-soil

Q₄^mcsoft soil with high water content,high compression,low permeability,low shear strength and so on.Groundwater corrosive strong,and rich in organic matter,resulting in the design and construction of the cement-soil mixing pile often appear slow solidification,low strength and core shape is not forming;In addition,engineering design and construction are often due to the permeability coefficient Improper value leads to the deviation,the overall grasp of the soft ground distribution and improve the performance of mixing pile cement soil has practical engineering significance.This paper focuses on the influence of the variable head test and the effect of admixture on the characteristics of cement soil.The main conclusions are as follows:（1）The influence of the time interval of the change of the head height on the measurement of the permeability coefficient is small.With the increase of the porosity ratio,the effect is slightly increased,but within the acceptable range.In the test,the change of the head height Time interval is 90min～150min,the interval is too short,the height of the head is too small,the reading error increases;the interval is too long,the permeability coefficient is long,the temperature difference of the test environment,the humidity difference and other factors Big.（2）The influence of the initial head height on the permeability coefficient of the muddy soil with different pore ratio is significant,and the larger the pore ratio is,the greater the effect is on the measurement result.The permeability coefficient of the larger soil samples is much larger than that of the small soils.As the initial head height increases,the pressure of the specimen increases,the structure of the soil is destroyed,the internal structure changes,the effective stress increases,the soil consolidation,permeability coefficient decreases.（3）In the variable head test,the influence of the initial head height on the accuracy of the permeability coefficient is mainly considered in the variable head penetration test.For the soil samples with high porosity ratio,the damage of the soil sample structure is small when the initial head height is small In view of the determination of the permeability coefficient is mainly to serve the engineering application,the test process also consider the engineering hydrogeological conditions,especially the groundwater level,etc.,is not the starting height of the smaller the better.（4）SV type curing agent is more suitable for the application of silt in the curing.The curing effect of Y-type curing agent on silt soil is remarkable,which can improve its compressive strength and compressive strength of cement silt.With the increase of Y-type curing agent,the compressive strength shows a uniform upward trend,Y-type curing agent on the sludge and silt are cured.The compressive strength of cement has a tendency to increase its compressive strength,and the compressive strength of cement silt has a uniform upward trend with the increase of early strength.On the silt and silt,soil curing effect.