Research For Solidification Ratio Optimization And Engineering Characteristics Of Wabu Lake Soft Soil In Shouxian County Of Huainan

Wabu Lake area in Shou county of Huainan City is located in an important position of urban development.There is a large number of soft soil around in Wabu Lake.These soft soils have the characteristics of low bearing capacity and high initial water content,which is not conducive to the development of local urbanization.In order to meet the requirements of practical engineering construction,soft soil foundation should be treated,and soft soil curing agent is a common treatment method.At present,cement is often used to solidify soft soil in engineering construction.However,cement will not only be accompanied by harmful gases such as CO₂and SO₂in the production process,but also has a large amount of cement and consumes a lot of resources in the use process,causing considerable trouble to the local sustainable development.Granulated blast furnace slag（GGBS）is an industrial waste slag that must be produced when smelting pig iron in industrial blast furnace.The composition of GGBS is similar to that of cement.It can be used to replace traditional cement as a new curing agent,which not only effectively reduces the environmental pollution brought by cement,but also solves the problem of industrial waste slag treatment.This paper takes Wabu Lake soft soil in Shou county,Huainan City as the research object.The main contents and research results are as follows:（1）According to the genesis and engineering characteristics of Wabu Lake soft soil,a new composite curing agent named GMN3 was prepared by selecting GGBS instead of traditional cement as the main curing agent Mg O and Na₂CO₃as alkaline activator.（2）The range of content of GGBS,Mg O and Na₂CO₃curing agents is determined through single mixing test,in which the research range of GGBS content is 8%～14%,Mg O content is 0.5%～2.5%,and Na₂CO₃content is 0.5%～3.5%.（3）Based on the Box-Behnken Design method of response surface method,the curing ratio of composite curing agent gmn3 to cure Huainan Wabu Lake soft soil is optimized by using design expert software.Taking the content ratio of GGBS、Mg O and Na₂CO₃as the influencing factor and the unconfined compressive strength of solidified soil under different curing ages of 7d and 28d as the target response value,the optimal content ratio of GGBS,Mg O and Na₂CO₃is determined to be 12.23%,1.64%and 2.22%through variance analysis and interaction analysis.（4）Through unconfined compressive strength test,the effects of curing agent content,different initial moisture content and organic matter content on the strength of solidified soil were studied.The results show that the strength of solidified soil can reach the maximum only when the content of curing agent reaches the optimal ratio;With the increase of initial moisture content,the strength of solidified soil increases first and then decreases.When the initial moisture content is 42%,the strength of solidified soil reaches the maximum;With the continuous increase of organic matter content,the strength of solidified soil continues to decline until it is gentle,and the decline speed is first fast and then slow.（5）Through the unconfined compressive strength test,the effects of curing agent dosage ratio,different initial moisture content and organic matter content on the mechanical properties of GMN3 solidified soil are studied:as the curing agent dosage ratio is closer to the optimal ratio,the solidified soil has brittle failure,its failure strain decreases gradually,and the unconfined compressive strength increases continuously;With the increase of initial moisture content,the maximum stress of GMN3 solidified soil increases first and then decreases;With the increasing content of organic matter,the failure characteristics of solidified soil gradually change from brittleness to plasticity.（6）The strength of GMN3 solidified soil under the optimal proportion is compared with that of 8%,12%and 14%cement solidified soil at different curing ages.The results show that under the optimal proportion,the strength of GMN3 solidified soil is equivalent to that of 12%cement solidified soil at the curing age of 7d;When the curing age reaches28d,the strength of GMN3 solidified soil exceeds 14%and 7%of that of cement solidified soil,which also shows that the new composite curing agent GMN3 has high applicability to the soft soil of Wabu Lake in Huainan.Figure[46]Table[16]Reference[74]...