Compression deformation law of compacted loess and its mathematical model
The high fill of loess is a hot issue in the field of geotechnical engineering,and its foundation stability and settlement are also the key issues in the filling area.To predict the total settlement or post-construction settlement data of the foundation in the filling area,it is necessary to study the compression deformation law of compacted loess.Through a large number of indoor confined compression tests,the compression deformation law of compacted loess in high fill area are examined.The stress-strain curves of compacted loess in different areas under different conditions are analyzed,and the compression char-acteristics and variation rules are discussed.The expression method of stress-strain curve under con-fined condition of compacted loess is established by Composite Power Exponent(CPE)model.The re-sults show that the strain of compacted loess increases with the increase of vertical load under the con-dition of lateral restriction.The compression deformation law of compacted loess in different sites and sedimentary ages is basically similar.When the same vertical load is applied,the strain decreases with the decrease of water content and decreases with the increase of compaction degree.As the degree of compaction increases,the ability of the sample to resist deformation becomes ever stronger;with the in-crease of water content,the ability of soil to resist deformation is weakened.Considering the water con-tent and compaction degree,the parameters of the CPE model are quantitatively described.The applica-tion of the mathematical model of the stress-strain curve of the compacted loess under lateral confine-ment in Lvliang Q3 loess shows the accuracy and rationality of the model,which provides a new idea for exploring the compression deformation of compacted loess.
compacted loesslateral compression testdeformation lawmathematical modeldeposi-tional age
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