淤泥改性土力学强度研究
Study on Mechanical Strength of Sludge-modified Soil
陈建民 1胡杰 1吴帅峰 1刘奔 1刘峥嵘2
作者信息
- 1. 湖南省交通规划勘察设计院有限公司,湖南长沙 410200
- 2. 湖南省衡永高速公路建设开发有限公司,湖南长沙 410004
- 折叠
摘要
道路工程中淤泥资源化利用是目前存在的技术难题,为此将淤泥改性成路基填料,以SM-C型改性剂对淤泥改性土的性能影响为研究主体,进行击实试验、无侧限抗压强度试验和CBR试验分析淤泥改性土力学性能的演变规律,进行干湿循环试验研究改性土抵抗水损坏的能力,进行微观试验研究淤泥改性土的改性机理.研究成果如下:①随改性剂掺量增加,改性土最佳含水率提高,最大干密度下降.②添加改性剂能显著提升淤泥改性土的无侧限抗压强度、CBR值,8％掺量的淤泥改性土可满足各等级道路路基填料CBR值要求.③随改性剂掺量的增加,淤泥改性土水稳性能提升明显.④微观试验结果表明,改性剂拌合淤泥发生水化反应,生成的碳酸钙及水化硅酸钙等水化产物填充在颗粒孔隙间,使土颗粒粒径增加,土体力学强度得到提升.
Abstract
The reasonable and effective utilization of sludge resources in road engineering is a current technical challenge.This study aims to modify sludge into roadbed fill material,with a focus on the impact of SM-C type modifier on the performance of sludge-modified soil.The study includes compaction tests,unconfined compressive strength tests,and CBR tests to analyze the evolution of the mechanical properties of modified sludge soil.Wet-dry cycle tests are conducted to study the water resistance of the sludge-modified soil,and microscopic experiments are carried out to investigate the modification mechanism of sludge-modified soil.The research findings are as follows:①The optimum moisture content of modified soil increases with the increase in modifier dosage,while the maximum dry density decreases.② The addition of the modifier significantly improves the unconfined compressive strength and CBR value of the sludge-modified soil.③With an increase in the modifier dosage,the water stability of sludge-modified soil improves significantly.④ Microscopic test results demonstrate that the modifier reacts with the sludge,generating hydration products such as calcium carbonate and hydrated calcium silicate,which fill the interparticle voids,increase particle size,and enhance mechanical strength.
关键词
路基工程/淤泥改性土/力学强度/改性机理/固废利用Key words
roadbed engineering/sludge-modified soil/mechanical strength/modification mechanism/solid waste utilization引用本文复制引用
出版年
2024
NETL
NSTL
万方数据