Influence of curing age and solidifying agent concentration on solidification effect of soil in rare earth mine storage yard
In order to investigate the effects of the concentration and curing age of composite soil solidifying agents on the solidification effect of abandoned rare earth mine yard soil,21 sets of direct shear tests were conducted to quantitatively analyze the concentration of solidifying agents(αw=2%,3%,4%,5% and 6% ),and curing age(t=3,7,14 and 28 d)on the shear strength index and shear stress of remolded soil samples.The experimental results show that soil cohesion and internal friction angle both significantly increase with the increase in curing agent concentration and curing age.Under a vertical pressure of 100 kPa,the peak shear stresses corresponding to soil samples with curing agent concentrations of 2%,3%,4%,5% and 6% are 97.69,122.46,139.46,186.49 and 220.97 kPa,respectively.αw=6%,the peak shear stress values of solidified soil with curing ages of 3,7,14 and 28 days are 158.24,189.29,210.61 and 220.97 kPa,respectively.When the concentration of the curing agent is 2%,the shear stress of the soil sample increases with the increase of shear displacement during the shear process.When the concentration of the curing agent increases to 6%,the shear stress of the soil sample shows a characteristic of first increasing,then decreasing,and finally maintaining stability with the increase of shear displacement.
万方数据
维普
