吹填淤泥土的双掺固化和配比优化试验研究
Experimental Study on Double-Mixture Solidification and Ratio Optimization of Dredger Fill Sludge
秦亮 1陈志敏 2卢永飞2
作者信息
- 1. 甘肃省交通规划勘察设计院股份有限公司,甘肃 兰州 730030
- 2. 兰州交通大学 土木工程学院,甘肃 兰州 730070;兰州交通大学 甘肃省道路桥梁与地下工程重点实验室,甘肃 兰州 730070
- 折叠
摘要
为了研究水泥和氧化钙双掺固化改良吹填淤泥土的最优配比,该文基于正交试验开展了双掺固化土的改性分析,最后通过模糊综合评价法对各配比方案进行了量化优选.结果表明:① 同等比例掺入条件下(掺入量 1.0%～4.0%),最优含水率与掺入量呈正线性相关,而最大干密度呈负线性相关;非同等比例下,规律不甚明显,但是相对水泥来说,氧化钙的减水效果要优于水泥的效果;② 试样的无侧限抗压强度受水泥和氧化钙相对比例影响,等比例掺入时呈正相关,但总体上水泥在双掺固化土强度增长过程中起主要作用;③ 采用模糊综合评价法,综合考虑项目固化施工成本、抗压强度、击实特性等多种因素认为山东玉龙岛炼化项目吹填淤泥的最优配合比方案是采用 2.0%水泥+1.5%氧化钙双固化,此时试样的最优含水率为23.3%,最大干密度为1.68 g/cm3,无侧限抗压强度为440 kPa.
Abstract
In order to study the optimal ratio of cement and calcium oxide by double-mixture solidification for improving dredger fill sludge,the soil modification results by double-mixture solidification were analyzed based on orthogonal experiments.Finally,the fuzzy comprehensive evaluation method was used to quantitatively optimize each ratio scheme.The results show that:① Under the same addition ratio(addition amount of 1.0%‒4.0%),there is a positive linear correlation between the optimal moisture content and the addition amount,and there is a negative linear correlation between the optimal moisture content and the maximum dry density.Under non-equal addition ratios,the law is not obvious.However,compared to cement,the water-reducing effect of calcium oxide is better.② The unconfined compressive strength of the sample is affected by the relative ratio of cement and calcium oxide,which is positively correlated when cement and calcium oxide are added in the same amount,but in general,cement plays a major role in the strength growth of soil by double-mixture solidification.③ By taking the fuzzy comprehensive evaluation method and considering various factors such as project solidification construction cost,compressive strength,and compaction characteristics,it is believed that the optimal ratio scheme for dredger fill sludge in Shandong Yulongdao Refining and Chemical Project is 2.0%cement +1.5%calcium oxide for double-mixture solidification.The optimal moisture content of the sample is 23.3%,and the maximum dry density is 1.68 g/cm3.The unconfined compressive strength is 440 kPa.
关键词
吹填淤泥/水泥/氧化钙/双固化改性/配合比/模糊综合评价Key words
dredger fill sludge/cement/calcium oxide/double-mixture solidification for modification/mixture ratio/fuzzy comprehensive evaluation引用本文复制引用
基金项目
国家自然科学基金资助项目(11662007)
出版年
2024
国家科技期刊平台
NSTL
万方数据