海泡石纤维固化盐渍土的强度试验研究

盐渍土为细颗粒的特殊土,易使路基路面产生溶陷、膨胀和腐蚀等病害,充分利用盐渍土作为路基填料成为沿海地区道路工程建设中的重要问题之一。利用海泡石纤维对盐渍土进行固化试验研究,分析了固化材料掺量、养护龄期、盐渍土含盐量及含水率对固化盐渍土强度的影响,并利用扫描电镜试验对固化盐渍土的机理进行了初步探讨。试验结果表明:0.8%~1.2%海泡石纤维固化盐渍土的强度符合规范要求。施工时尽量采用低含盐量的盐渍土,施工含水率应控制在略高于最佳含水率5%范围内。经海泡石纤维固化后的盐渍土,海泡石纤维缠绕填充在土体孔隙中,使得土体更加密实。

Test Research on Strength of Saline Soil Solidified with Sepiolite Fiber

Saline soil is a special soil that consists of fine particles and has poor engineering properties.It causes salt heaving and is collapsible and corrosive.The treatment of this type of soil for the use as a resource for roadbed fillings has been one of the most important engineering topics in highway construction near coastal areas.This study introduces a new curing material,called sepiolite fiber,which is used to amend and stabilize saline soil.To test the effects of sepiolite fiber-solidified saline soil,unconfined compressive strength(UCS)tests were carried out on unmodified and sepiolite fiber-modified saline soil samples,respectively.The influences of multiple factors,including sepiolite fiber content,curing age,salt content and water content,on the unconfined compressive strength(UCS)of stability coastal saline soil were discussed.Based on the scanning electron microscope(SEM)results,the curing mechanism of strength improvement was analyzed.The test results showed that the UCS of saline soil with 0.8%~1.2%sepiolite fiber stabilized attained corresponding engineering standards.During the construction,it should pay attention to adopt the saline soil with low salt content.The construction water content should be controlled at a slightly higher than the optimal water content of 5%.According to the SEM analysis results,it was found that the modification process produced denser and more stable soil because sepiolite fiber wound and filled in the soil pore.