Solidified Soil Base Based On New Soil Stabilizer Road Performance Research

In the context of China’s rapidly growing national economy,the transport industry is the most important carrier in the economic development of China,which makes the demand for road construction in China increase.However,the traditional road construction requires mining a large amount of natural resources,which will cause not only severe natural damage to the environment but also scarcity of resources like stone,sand,and stone,which is not easy to buy in many areas.If the traditional road construction materials are not used in road engineering construction,and the new soil curing agent with stable engineering nature,small environmental pollution and good economy can be used,it his will be conducive to fostering the development of highway engineering construction in China.Based on the actual scientific research project,this paper uses the new soil curing agent and some cement developed by Southwest University of Science and Technology to improve the soil with different moisture content,and conducts extensive research into the mechanical properties of improved soils.The influence of subgrade load carrying capacity,curing material content,and structural layer thickness on the mechanical properties of the solidified ground base road structure is also discussed by means of numerical simulations.Lastly,the feasibility of a solidified soil based on a novel soil curing agent as a road base is demonstrated through examples of engineering applications.The main results of the research on the road performance of the solidified soil base based on the new soil stabilizer are as follows:(1)Through indoor geotechnical tests,the 7d unconfined compressive strength index is used as the basis for the design of the mix ratio,and the best mix ratio for silty clay with different water contents and new soil solidification materials is proposed;(2)The difference in the moisture content of the silty clay in the soil hardening agent under the best mixture ratio of unconfined compressive improvement rate compared to plain soil is greater than 500%,resilient modulus value reached nearly 800 MPa,filler minimum strength(CBR)is not less than 3%,soaking water swelling and water absorption is significantly lower than the plain soil,7 days after soaking strength can still reach nearly 0.5MPa,the relevant mechanical indicators meet the specification requirements;(3)the use of soil curing agent as a road base material,its tensile and compressive stress range and vertical displacement range are less than the "road engineering construction and quality acceptance specification" in the design value,the mechanical properties of the road structure has improved;(4)the bearing characteristics of the road is not only related to the road structure design,but also related to the bearing capacity of the roadbed,comprehensive consideration of engineering cost and mechanical properties of the principle of optimization,when the bearing capacity of the roadbed is less than 120 kPa,it is recommended that the thickness of the concrete surface layer is 18～20cm,the thickness of the solidified soil base is50～80cm;When the bearing capacity of subgrade is 120～180kPa,it is suggested that the thickness of concrete surface layer should be 16～18cm,and the thickness of solidified soil base should be 40-50cm;When the bearing capacity of subgrade is greater than 210 kPa,it is recommended that the thickness of concrete surface layer should be 14～16cm,and the thickness of solidified soil base should be 30-40cm;If possible,try to take the upper limit.(5)Through the comparison of the test results of the field engineering application,the road performance and environmental performance of the solidified soil base based on the soil curing agent can meet the requirements of the pavement base material.The project cost is10%～20% less than that of the traditional cement stabilized macadam base,and the construction period is shortened by nearly 60%.