水泥加固海积软土影响因素试验研究

Experimental Research on Influentical Factors of Soft Clay Treated by Cement

由于沉积环境和物质组成的差异,不同地区软土以水泥作为固化剂加固效果差别较大。从土质与掺入料两个方面的影响因素出发,进行了大量的室内试验研究,试验结果表明广州番禺软土水泥土当水泥掺入比高于16%后,其强度增长速率缓慢;水泥土无侧限抗压强度随软土粘粒含量的增加大体呈降低趋势,但当粘粒含量一定时,水泥土无侧限抗压强度存在峰值含水率,当含水率超过峰值时,其强度变化不明显;对比分析不同有机质含量的水泥土试验结果发现软土中有机质对水泥加固土强度的影响远大于对其变形模量的影响,加入掺入比>2%的石膏可以有效改善高有机质含量软土的加固效果。养护条件对水泥土强度有一定影响,软基处理设计时应考虑实际水泥土桩桩身强度与室内试验结果的差异。

Due to sedimentary environment and material composition, soft soil treatment with cement in various regions. The paper conducts there is significant difference on the effectiveness of massive laboratory experimental research on the influence factors of soil characteristics and admixture. The experimental result shows the strength increasing rate would be slow in case the mixing rate of cement for soft soil is higher than 16% in Guangzhou Panyu, in general, the unconfined compressive strength of cement-stabilized soil is in decreasing trend with the increase of clay content in soft soil. While the clay content of soft soil maintains at a certain level, there is a water content peak on the unconfined compressive strength, and in case the water content exceeds the peak,there is no significant alteration of the strength. By the contrastive analysis on the experimental results of cement-stabilized soil with different organic content,it shows the influence of organic material in soft soil on the cement reinforcing strength is far more than its influence on the deformation modulus, and the treatment effectiveness on soft soil with organic material can be significantly improved by adding plaster of more than 2%. Curing conditions have certain influence on the strength of cement-stabilized soil. In the soft foundation treatment and design, the difference between the actual strength of cement soil pile and the laboratory experimental results shall be taken into consideration.