Experimental Study on Freeze-thaw and Strength Characteristics of Artificially Frozen Cement-improved Soft Clay
To investigate the frost heave and thaw settlement characteristics of artificially frozen cement-improved soft clay as well as the variation of strength before and after freeze-thaw cycles,laboratory experiments including frost heave and thaw settlement tests,and uniaxial compression tests were conducted to reveal the frost heave,thaw settlement,and strength properties of cement-improved soft clay under different freeze-thaw conditions and influencing factors.The results show that the freeze-thaw ratio and settlement coefficient of soft clay decrease with decreasing freezing cold end temperature,and the settlement coefficient is greater than the freeze-thaw ratio.After adding cement,the settlement coefficient is smaller than the freeze-thaw ratio,and decreases with increasing ce-ment content.When the cement content exceeds 5％,the settlement coefficient is less than 2％.The initial freez-ing temperature of cement-treated soil decreases with increasing cement content,reaching a minimum of-1.53℃when the cement content is 9％.The freeze-thaw process is divided into three stages:active freezing,maintenance freezing,and melting,with temperature field changes at different heights of the sample.The strength of cement-improved soft clay decreases after freezing and thawing,with an average reduction of 56％in 25 sets of samples,and the maximum strength reduction after freezing and thawing reaches 76％.The study indicates that the strength of improved soil increases with increasing cement content,decreases with increasing moisture content,and increases with age.
artificial ground freezing methodcement stabilized soilfreeze-thaw settlementfreezing temperature fieldstrength
万方数据
维普
