固化淤泥土压缩性试验研究

淤泥由于含水率高强度低,无法直接作为工程用土。对淤泥进行固化处理,可以实现废弃淤泥的资源化利用。选择常州市武进区废弃淤泥作为研究对象,利用42.5普通硅酸盐水泥作为固化添加剂,通过固化淤泥的单向压缩试验,探讨4种水泥参量变化条件下共24个试样的压缩变化机理,描述水泥添加量对压缩模量的影响,分析其影响规律。通过试验对比分析,可知：同一含水率下,淤泥随着水泥参量的增加,试样压缩性减小;各试样在压缩试验过程中,其压缩变形规律基本一致,荷载达到200kPa时,其压缩性趋于稳定;随着固结压力的不断增加,沉降变形量逐渐减缓,最后趋于收敛;随着水泥参量的增加,同一应力条件下,试样稳定需要的时间缩短;淤泥固化效果在水泥参量接近50%时较优,超过此数值,强度虽提高,固化工作经济效益降低。

An Experimental Study on the Compression of Solidified Sludge

Because of its high moisture content and low strength,sludge can not be used directly in engineering.The solidification treatment of sludge would enable the utilization of sludge,turning a waste material into useful resource.The sludge was chosen from Wujin district in Changzhou as an object of study. By using ordinary silicate cement as a curing additive,through one-way compression tests,the compression mechanism of 4kinds of cement parameter variation for 24samples were explored,the impact of cement content on the compression modules was described,and the rule to get the basic experimental data for engineering and scientific research were analyzed.A comparative analysis of the experiment indicates that,with the same water content,the sludge sample＇s compressibility decreases with the increase of cement parameters;the sample′s compression deformation rate remain consistent in the process of compression tests;when loading up to 200kPa,its compression is more stable;as the solidification pressure increases,the settlement deformation rate gradually slows down,and finally it tends to converge;with the increase of cement parameters,under the same stress condition,the time for the sample stability becomes shortened;the optimal result of sludge solidification is acquired when the cement reaches up to 50%.A higher content of cement would increase the strength but decrease the economic benefits in engineering.