2种复合固化剂作用下有机质土的渗透性  

Permeability of organic soil treated with two composite stabilizers

作　　者：畅帅[1,2] 徐日庆[1,2] 李雪刚[1,2] 徐丽阳[1,2] 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《中南大学学报（自然科学版）》2014年第6期2021-2028,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51178420)

摘　　要：为研究复合固化剂GX07与XGL2005的降渗效果以及有机质对水泥土固化反应的影响，对这2种固化剂作用下的人工有机质土进行渗透试验。结果表明：腐植酸掺量为6%且水泥掺入比wc≤15%时，GX07的降渗效果比XGL2005发挥得更为迅速，XGL2005的降渗效果完全发挥需要比60 d更长的龄期。通过分析龄期与水泥掺入比对土体固化的影响，提出水泥最优掺入比wco与固化土极限渗透系数ku的概念，并得出当腐植酸掺量为6%时，GX07和XGL2005固化土样的wco分别约为10%和12%。对GX07加固的试验土样，ku约为4×10-9 cm/s。进一步研究发现：当wc为10%~15%且T为3~28 d时，2种复合加固土渗透系数随龄期的变化在单对数坐标系下均有较好的线性关系，由此建立这2种复合加固土的渗透系数预测模型。To explore the effect of permeability reduction of GX07 and XGL2005 and investigate the influence of organic matter on the chemical reaction of soil with cement, permeability tests were conducted on artificial organic soil treated with these two composite stabilizers. By contrasting the results, it is concluded that on the premise of humic acid content 6% and cement content wc≤15%, the function of reducing permeability of GX07 can be fulfilled more rapidly than that of XGL2005, which may involve longer age than 60 d to be performed completely. On the basis of analyzing the influence of age and cement content on soil stabilization, concepts of optimal mixing ratio wco and ultimate permeability coefficient ku are proposed. And wco for stabilized soil treated with GX07 and XGL2005 is around 10% and 12% respectively while ku for GX07-treated test soil sample is 4×10-9 cm/s approximately once humic acid content is 6%. Further work shows permeability coefficient decreases linearly as age increases in single logarithm when wc is 10%-15% and T is 3-28 d, based on which a forecasting model for the permeability coefficients of soil treated with these two composite stabilizers is put forward.

关 键 词：有机质土 腐植酸 最优掺入比 极限渗透系数 预测模型 

分 类 号：TU472[建筑科学—结构工程]