吹填淤泥落淤渗透压缩非线性关系分析  

Analysis on nonlinear relationship of permeability and compressibility of dredged fill during self-weight deposition

作　　者：秦现军[1] 李瑞玲[1] 张明[2] 

机构地区：[1]鹤壁职业技术学院,河南鹤壁458030 [2]河南工程学院,郑州451191

出　　处：《工程勘察》2011年第5期12-15,共4页Geotechnical Investigation & Surveying

摘　　要：沿海地区围海造陆吹填淤泥吹填后落淤阶段渗透压缩特性的认识,对其自重固结性状预测及后续软基处理设计具有重要意义。由于吹填淤泥吹填初期呈泥浆状,取样试验存在诸多困难,现有渗透固结试验仪测定其渗透压缩参数周期长、成本高,因此对超软土渗透压缩特性的研究工作还非常有限。本文在总结淤泥渗透压缩非线性关系及渗透系数与物理性质之间经验关系的基础上,提出了一种吹填淤泥落淤渗透压缩非线性关系分析方法,并将其应用于围海造陆工程。结果表明:落淤过程中吹填淤泥渗透系数及自重应力与孔隙比呈现较好的指数函数关系。该方法具有使用简洁方便、准确性高等优点,为吹填土落淤过程自重固结性状数值分析提供了理论依据。The understanding on permeability and compressibility characteristics of dredged fill during self-weight deposition will have great significance in the prediction of self-weight consolidation properties and the design for soft clay foundation improvement.Dredged fill is characterized of high water content and many difficulties in sampling test,and the existing permeability and consolidation test apparatus is characterized of long life cycle and high cost in determining permeability and compressibility parameters,therefore the research work on permeability and compressibility characteristics of ultra soft clay is very limited.Based on the summarization of nonlinear relationship of permeability and compressibility,the empirical relation of permeability coefficient and physical properties for silt,the analysis method of nonlinear permeability and compressibility relationship for dredged fill during self-weight deposition is proposed.This method is introduced into the analysis on land reclamation projects,and it shows that the relationship of permeability coefficient-void ratio and self-weight stress-void ratio for dredged fill during self-weight deposition shows a good exponential functions.The proposed method has some advantage of simplicity,applicability and high accuracy,which provides a theoretical basis for numerical analysis on self-weight consolidation properties for dredged fill during self-weight deposition.

关 键 词：吹填淤泥 落淤 孔隙比 自重应力 渗透系数 自重固结 

分 类 号：TU445[建筑科学—岩土工程]