摘要
随着沿海开发的不断推进,在沿海软土地区进行工程建设经常会遇到高含水率淤泥的处置问题。基于传统的挖除、置换或晾晒加灰改良等方法存在或经济成本过高或易受场地、天气等因素限制的工程现实,基于秸秆焚烧引发空气污染问题突出的现状,提出将麦秸秆打成辊,作为新型竖向排水体,代替传统真空固结法中的砂井或塑料排水板,用于高含水率淤泥处理。为了探讨秸秆排水体真空预压处理高含水率淤泥的可行性与适用性,进行了系列室内实验。为了给秸秆排水体设计优化方案的制定提供理论依据,进行了秸秆排水体设计参数的敏感性分析及其优水平组合研究。室内实验结果表明,秸秆排水体真空预压处理高含水率淤泥可行,处理效果良好;秸秆辊直径越大,排水效果越好,固结沉降越大。室内实验与灰色关联分析方法分析显示:直径比初始密度敏感。室内实验与方差分析法结果表明,秸秆辊直径与初始密度因素主次顺序为,直径为主,初始密度为次;优水平组合为直径20cm,密度0.121g/cm^3。
As coastal development proceeds, the disposal of silt with high water content raises challenges to engineering construction in coastal soft soil areas. Because conventional approaches such as excavation, replacement, drying or modification with ash are either costly or restricted by site, weather or other factors, and straw combustion causes air pollution, wheat straw rolls was proposed to be used as new vertical drains in place of sand drain or plastic drainage board used in traditional vacuum drainage consolidation for treating silt with high water content. For discussing the feasibility and applicability of treating silt with high water content by straw drains on vacuum preloading, a series of indoor experiments have been performed. For providing theoretical basis for optimization design of straw drain, the sensitivity analysis on factors influencing drainage result and theoretical research on the optimal level combination design have been made. Indoor experiments show that treating silt with high water content by straw drains on vacuum preloading is feasible and effective. The larger is the diameter of straw roll, the better is the drainage effect, and the larger is the consolidation settlement. Indoor experiment and grey correlation analysis reveal that the diameter is more sensitive than the initial density. Indoor experiments and variance analysis reveal that the diameter of straw roll is the primary factor while the initial intensity is the secondary factor and the optimal combination of the factors is 20 cm diameter and O. 121 g/cm3 density.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第A01期3432-3440,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
江苏省交通运输科技项目(2014T01–1)~~
关键词
地基基础
秸秆辊
淤泥
真空预压
foundation
straw rolls
silt
vacuum preloading
