弱固结砂土抗剪强度及微观特征试验研究OA

The weakly consolidated sandy soil,due to its unique genesis and mechanical characteristics,exhibited significant water sensitivity and mechanical degradation in plateau environments.The preparation moisture content was a key factor influencing the mechanical properties of sandy soils in this region,particularly in terms of shear strength and microstructure.Through a series of mechanical tests and microscopic scanning analyses,this paper investigated the effects of different preparation moisture contents on remolded sandy soil from the Zanda area.The results show that preparation moisture content significantly affects the soil's shear strength,microstructure,and pore characteristics.When moisture content is below 4%,the soil exhibits higher shear strength,as matric suction between particles enhances inter-particle bonding.When the moisture content reaches the optimum value of 8%,the soil demonstrates peak shear strength and the most favorable microstructure.As the moisture content further increases to 10%or higher,the soil's shear strength drops significantly,the pore structure becomes loose,and particle contacts become unstable.