粉煤灰联合水泥原位固化软土现场试验研究  

Experimental study on in-situ solidification of soft soil by fly ash combined with cement

作　　者：胡志明[1] 王子帅 张艳林 王东星[2] 乔少博 卓师婷 HU Zhi-ming;WANG Zi-shuai;ZHANG Yan-in;WANG Dong-xing;QIAO Shao-bo;ZHUO Shi-ting(Sinohydro Bureau 7 Co.,Ltd.,Chengdu,Sichuan 610213,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610213 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《中国港湾建设》2024年第5期40-47,72,共9页China Harbour Engineering

基　　金：国家自然科学基金(52079098)。

摘　　要：针对软土含水率高、承载能力低和粉煤灰资源利用化等工程难题,采用原位固化和强力搅拌工艺,进行粉煤灰联合水泥固化软土施工,开展了不同固化剂配比、处理深度和龄期下固化土轻型动力触探测试,并对数据进行系统分析。结果表明:加入1%粉煤灰能够有效降低水泥固化软土含水率,含水率降低幅度随水泥用量增加而增加;粉煤灰联合水泥原位固化对软土密度影响较小,但会限制固化土早期承载力的发展;固化土承载力随深度增加存在较大波动,增加处理深度有助于减小波动幅度;粉煤灰联合水泥使用将进一步提升水泥固化土对重金属及污染物稳定作用。尤其地,基于双线性插值算法提出固化配比量化方法,并引入变异系数建立原位固化评价指标,可为类似软土原位固化施工工程提供参考依据。To solve the problems such as high water content,low bearing capacity and reutilization of fly ash in soft soil,the combination of fly ash and cement in solidifying soft soil was carried out by in-situ solidification and strong mixing processes.The light dynamic penetration tests on solidified soil under different binder amounts,treatment depths and curing ages were carried out to analyze the in-situ data systematically.The results show that adding 1%fly ash can effectively reduce the water content of cement-solidified soft soil,and the reduction rate rises with increasing cement content.The in-situ solidification of fly ash combined with cement has little effect on density of soft soil,but it will limit the development of bearing capacity.The bearing capacity fluctuates greatly with depth,and increasing the treatment depth helps to reduce the fluctuation range.The use of fly ash combined with cement will further enhance the stabilization of heavy metals and pollutants.Based on the bilinear interpolation algorithm,the quantitative evaluation method of curing ratio is proposed,and the coefficient of variation is introduced to establish the evaluation index of in-situ solidification,which can provide a reference basis for similar soft soil in-situ solidification construction projects.

关 键 词：原位固化 软土 水泥 粉煤灰 变异系数 

分 类 号：U655.544[交通运输工程—港口、海岸及近海工程]