Research On The Relationship Between Modulus And Thickness Of Silt Roadbed Improved By Industrial Waste Residue In Huangfan District

Southwest Shandong Province is located in the Yellow River flooding area,where there are a lot of alluvial silt,which is often used as subgrade filling for road construction.The poor bearing capacity of subgrade is caused by the poor gradation,poor structure,easy liquefaction and other special engineering properties of silt in Yellow River flooding area,which determines that it is difficult to be directly applied to road engineering construction.With the increase of the current traffic load,the bad characteristics of silt make its application in the design and construction of road subgrade more and more limited.How to improve the bearing capacity of silt subgrade in the Yellow River flooding area and meet the increasing demand of traffic load is an urgent problem to be solved in the road engineering construction in the Yellow River flooding area.Based on the above problems,this thesis uses the method of industrial waste to improve the silt,evaluates the improved silt through compaction,unconfined compressive strength,California bearing ratio and freeze-thaw cycle tests,and carries out repeated loading dynamic triaxial test to obtain the modulus of resilience,studies and calculates the relationship between the bearing capacity and thickness of industrial waste improved subgrade,that is to say,the equivalent modulus and deflection of different subgrade thickness and improved soil modulus are calculated by software,and the relationship between subgrade equivalent modulus and deflection and subgrade thickness and improved soil modulus is obtained,when the equivalent modulus is constant,the subgrade thickness under different modulus of improved soil is calculated,and the relationship between improved subgrade thickness and improved soil modulus under controlled equivalent modulus is obtained,the test road is paved to carry out the field test of industrial waste slag improved silt filling subgrade.The main research contents and results of this thesis are as follows:(1)The system summarizes the status quo of the powder roadbed and the improved powder roadbed and the research on the thickness of the roadbed at home and abroad.(2)Since there are many types of industrial waste,this thesis has selected two industrial waste residue formulations,and the industrial waste gauge of industrial waste flooding is 5%?10%?15%,compared with cement soil,which is formulated.Steel slag: high territory: cement= 65: 12: 23,Formula Di-sulfide gypsum: cement: steel slag: slag = 10: 15: 40: 35,cement modified soil in cement duct is 4% ? 6% ? 8%.Through the indoor trial,the physical mechanical properties and durability and durability of the soil were studied,and the effect of industrial waste sagging soil and cement improved soil was compared.The results show that it is determined that 10% is the optimal amount of industrial waste reform soil,and the strength durability is stronger than 6% cement soil.(3)Based on the indoor repeated loading triaxial test,the influence of the content of industrial waste slag on the modulus of the improved soil is analyzed.The relationship between the thickness and modulus of the subgrade and the equivalent modulus of the subgrade and the deflection is obtained by calculation,and the relationship between the modulus and the thickness of the subgrade is calculated by the modulus.The results show that with the increase of the content of industrial waste slag,the dynamic resilient modulus of the improved soil increases,The increase is decreasing.The equivalent modulus of subgrade increases with the increase of subgrade thickness and improved soil modulus.When the subgrade equivalent modulus is constant,the subgrade thickness decreases with the increase of improved soil modulus.(4)The field tests of industrial waste residue and cement improved soil were carried out,and the superior mechanical properties of industrial waste residue improved silt were demonstrated.The results show that the road performance of 10% industrial waste improved silt is better than that of 6% cement soil,and the industrial waste improved silt is more environmentally friendly.The relationship between equivalent modulus of subgrade,modulus of improved soil and thickness of Subgrade in Chapter 4 is verified by field test of resilient modulus and deflection.