摘要
为研究石棉纤维加固软土的效果和机理,改善水泥土的脆性破坏特点,提出将石棉纤维的物理加筋作用与水泥、粉煤灰的化学加固作用相结合,通过对不同纤维掺量（0%～9%）的石棉纤维粉煤水泥复合土进行直剪试验、无侧限抗压强度试验、劈裂试验、扫描电镜试验,进而对石棉纤维加筋水泥土的强度性质和影响机理进行探讨.研究表明,石棉纤维配合水泥与粉煤灰能显著提高软土的强度和稳定性,改善水泥土的破坏形式.水泥粉煤灰配比一定时,石棉纤维增强水泥复合土各强度指标值存在最优掺量,纤维添加量在3%～6%之间,石棉纤维的加筋效果在水泥土中能得到很好的发挥,超过最优掺量则会降低复合土的强度值.
This paper aims to improve the brittle fracture characteristics of cement soil and to study the engineering properties and mechanical mechanism of asbestos fiber reinforced soft soil. It adds the asbestos fiber into fly ash and cement soil. Thus it creates a new kind of composite soil and carries out a series of experiments on the new soil. In these experiments,asbestos fiber is added into fly ash and cement soil with different ratios( 0%~ 9%),which results in different composite soil samples with different content of asbestos fiber. All of the composite soil samples are subjected to the direct shear test,the unconfined compression test,the diametral compression test and the scanning electron microscopy test( SEM). Thus the mechanical behavior and mechanism of fiber reinforced soft soil are illustrated. It is found that the combination of asbestos fiber and fly-ash cement can significantly enhance the strength and stability of soft soil and improve brittle fracture characteristics of cement soil. There is a range of optimal content of asbestos fiber regarding the enhancement of the strength value of the composite soil. This range is between 3%~ 6%. Other asbestos fiber content outside the range can reduce the enhancement effect.
出处
《工程地质学报》
CSCD
北大核心
2015年第5期982-988,共7页
Journal of Engineering Geology
基金
武汉市建设科研项目深基坑被动区结构化加固新技术研发(201219)资助
关键词
石棉纤维
粉煤灰
水泥土
软土加固
微观结构
Asbestos fiber,Fly-ash,Cement soil,Reinforcing soft soil,Microstructure
作者简介
张艳军（1983-）,男,硕士,国家注册岩土工程师,主要从事岩土工程设计与研发.Email：littlezhang2003＠163.com
于沉香（1987-）,女,硕士,工程师,主要从事岩土体工程技术研究.Email：yuchx2013＠qq.com
