Optimization Research For Stabilizing The Wabu Lake Soft Soil By GGBS

China has a vast land and a large land occupation area,among which there are a large number of soft soil phenomena in some coastal areas and inland cities,the soft soil has a large water content,low shear strength,easy to produce settlement and deformation characteristics.However,the solidification strength of foundation soft soil is directly proportional to the safety factor of the project,so the solidification of soft soil is an important link in practical engineering.Nowadays,cement is commonly used in engineering construction to solidify soft soil.In the process of cement production,a large amount of toxic gas and carbon dioxide will be produced,which consumes a lot of resources and causes serious pollution to the environment.Moreover,high cost of cement production.However,granulated blast furnace slag?GGBS?is a kind of waste slag produced in the process of industrial production.The hydration products of blast furnace slag is similar to that of cement,so blast furnace slag can be used to replace cement as a soft soil curing agent,which not only reduces environmental pollution but also can be used for secondary utilization of waste slag,which conforms to the development status of circular economy in China.In this paper,the soft soil in the Wabu Lake area of Huainan was taken as the research object,according to the engineering characteristics of the soft soil in the Wabu Lake area,the blast furnace slag?GGBS?with potential hydration activity was selected as the main curing material,calcium oxide?CaO?and sodium sulfate?Na₂SO₄?as an activator to solidifying Wabu Lake soft soil.The main content and research results are as follows:?1?Through the study of the single factor effect of three kinds of curing factor analysis,obtain GGBS in the study of the content of the solidified soil range from 8%to 14%,calcium oxide content in the stabilized soil research ranges from 2%to 5%,sodium sulfate content in the stabilized soil research ranges from 2%to 6%,and only mixed quicklime stabilized soil unconfined compressive strength value of the largest growth.?2?The Box-Behnken Design experimental design method was used to analyze the interaction of three experimental influencing factors and the variance analysis of the functional model test data,and the optimization analysis results were obtained by combining with the Design-Expert software:the optimal mix ratios of GGBS,CaO and Na₂SO₄ were 12.12%,4.09%and 4.70%respectively.?3?Through unconfined compressive strength test of soft soil with the same initial water content and different curing agent ratio,it is found that the reduction of water content ranges from 5%to 6%at the age of 7 days.When the mixing ratio of three curing agents is 14%,5%and 4%,the reduction of soil water content reaches the maximum and the strength of solidified soil reaches the maximum.At the age of28 days,the reduction of water content ranges from 5%to 8%.When the mixing ratio of three curing agents is 11%,3.5%and 4%,the reduction of water content of soil reaches the maximum,and then the strength of solidified soil reaches the maximum.?4?The mixing of organic matter has a significant inhibitory effect on the curing effect of soil.In the optimal ratio,the curing effect of organic matter on soil has two stages:at the initial stage of the age of 7 days,when the mixing ratio of organic matter is 3%-13%,the strength of solidified soil decreases significantly with the increase of organic matter.In the later stage,when the organic matter mixing ratio was 13%-18%,the increase of organic matter had little influence on the strength of solidified soil.When the organic matter mixing ratio reached 18%,the strength value decreased by44.2%compared with the initial organic matter mixing stage.The change of the strength of solidified soil at the age of 28 days was the same as that at the age of 7days.When the organic matter mixing ratio reached 18%,the strength value decreased by 46.3%.?5?By solidified soil under different ratio of curing agent on the unconfined compressive strength test found that under different ratio of curing 28d compressive strength of solidified soil is greater than the 7d strength value,in the eight group contrast experiment,when the mixed curing agent than in 12.12%,4.09%,4.70%,the strength of the two ages reach maximum respectively,which is higher than that of the other seven groups.?6?Validation of composite curing agent GSS3 wabu lake the feasibility of soft soil solidification,through experiment the GGBS solidified soil with different content of cement solidified soil in curing 7d and 28d strength of solidified soil under comparative analysis,the results show that:under the condition of the optimal ratio,7d instars of GGBS solidified soil unconfined compressive strength can reach1231kPa,with the strength of the cement content of 14%by close.At 28 days,the strength is close to 1520kPa,and the strength is higher than that of three different content of cement solidified soil.Figure:[42];Table:[14];Reference:[60]...