Study On Optimization Of Solidification Formula Of Huxi Soft Soil In Shou County

The Wabu Lake in Shou County,Huainan City has a special geographical location and a large amount of lacustrine soft soil.These soft soils are characterized by high natural water content,strong compressibility,large porosity ratio and low bearing capacity,which are not conducive to project construction,which seriously hinders The development of the region.In order to make the various engineering indexes in these soils meet the actual engineering construction needs,it is often necessary to solidify the soft ground.Cement is a commonly used soft soil curing agent,but when producing cement,it will generate a large amount of carbon dioxide and other toxic gases,seriously polluting the environment,and the cost is high.According to the characteristics of soft soil in Wabu Lake area in Shou County,this paper selects a curing agent suitable for strengthening the soft soil in this area,and uses Box-Behnken method in response surface method to optimize the formulation of the curing agent.The main contents and important conclusions of this article are as follows:?1?Based on the engineering characteristics of the soft soil in the Wabu Lake area of Shou County,combined with the characteristics of high water content and high organic matter in the soil,from the perspective of environmental protection and the feasibility of recycling industrial waste slag,granulated blast furnace slag GGBS)as the main curing agent,calcium oxide?CaO?and sodium carbonate?Na₂CO₃?as the stimulant,the composite curing agent composed of the three strengthens the soft clay.?2?The Box-Behnken method in the response surface method was introduced into the optimization study of the three external additive formulas.Through the analysis of variance and interaction mechanism of the three impact factors,the Granulated Blast Furnace Slag?GGBS?was obtained with the help of Design-Expert software),Calcium oxide?CaO?and sodium carbonate?Na₂CO₃?,the best formula of the three external additives are 13.10%,4.32%and 1.09%.?3?The strength comparison test of composite solidified soil and cement solidified soil was carried out by changing the content of organic matter.The results showed that under the curing age of 7d and 28d,the unconfined compressive strength of the best formula of composite solidified soil and 8%cement solidified soil were affected by organic matter The influence of the amount of change,and the unconfined compressive strength of the cement-solidified soil is more affected by the amount of organic matter,and the strength loss rate is higher than the composite solidified soil.?4?The 7d and 28d curing ages of composite solidified soil and cement solidified soil strength comparison test found that with the growth of curing age,the strength of composite solidified soil under the best formula growth rate is faster than8%cement.?5?By changing the initial moisture content of the soft soil,the strength comparison test of the composite solidified soil and the cement solidified soil was carried out.The results showed that when the initial moisture content of the soft soil was between 25%and 40%during the curing period of 28 days,the two types of solidification The unconfined compressive strength of the soil is positively correlated with the initial moisture content of the soft soil,but the strength loss rate of the two solidified soils is exactly the opposite.When the initial moisture content of the soft soil is greater than 40%,the unconfined compressive strength of the two solidified soils decreases as the initial moisture content of the soft soil becomes larger,and its strength loss rate also gradually increases,and 8%The strength loss rate of the mixed cement is greater than that of the best formulated composite solidified soil.Figure:[39];Table:[10];Reference:[53]...