水泥固化锌污染土压缩特性影响因素分析

Analysis of the influence factors on the compressive properties of cement solidified zinc contaminated soils

基于固结试验,研究了不同养护温度、锌离子质量分数及水泥掺量条件下水泥固化锌污染土的压缩特性,推导出能够综合反映三者对压缩系数影响规律的经验式。结果表明:基于该经验公式,根据某一已知条件(即上述3个变量值)对应的固化体或者素土的压缩系数值可以较好地预测其他条件下的固化体压缩系数。此外,锌离子质量分数一定时,固化体压缩系数随水泥掺量的增大呈指数性减小。水泥掺量一定时,压缩系数随锌离子质量分数的增大而增大。压缩系数随养护温度的提高而减小,固化体压缩系数比值与养护温度之间呈现较好的对数函数关系。

Consolidation tests were carried out to investigate the effects of cement content,zinc ion concentration and curing temperature on the compression coefficient of cement solidified zinc contaminated(CSZC)soil.A regression formula was derived to correlate the compression coefficient of CSZC soil with the above-mentioned three parameters.The results indicate that the regression formula is able to reasonably predict the compression coefficient of CSZC soil provided that the compression coefficient of CSZC soil under a given combination of cement content,zinc ion concentration and curing temperature is known or the compression coefficient of the soil without contamination is known.In addition,the compression coefficient exponentially decreases with increasing cement content for a given zinc ion concentration,and increases with increasing zinc ion concentration for a given cement content.Moreover,the compression coefficient decreases with increasing curing temperature.The ratio of compression coefficient at different temperatures to that at 20℃satisfies the logarithm relationship of temperature.