结合水对昆明红黏土压缩特性的影响研究OACSTPCD

Through isothermal adsorption test and compression test,the change rule of compression properties of Kunming red clay with water content is obtained,the relationship between the content of bound water and the compressibility index of red clay is discussed,and the microscopic mechanism of the influence of bound water on its compression properties is explained.The MATLAB is used to construct corresponding mathematical model to reveal the compression mechanism of red clay from the perspective of soil mechanics.The results show that,(a)the isothermal adsorption curve of Kunming red clay can be divided into three stages;(b)the compression coefficient showed a"Unimodal"value with the change of water content,and the compression modulus showed a decreasing trend with the increase of water content with an exponential function relationship;(c)taking the water content as bridge,the corresponding relationship between the compression coefficient and the pore ratio is revealed by three-dimensional fitted surface;and(d)the content of bound water affects the stability and compressibility of soil particle structure,and with the appearance of free water,the connection between water films decreases,resulting in the reduction of friction between soil particles and the weakening of compressibility resistance.