黑龙江干流工程吹填堤防固结特性及固结沉降研究

Study on the Consolidation Characteristics and Consolidation Settlement of Blow-fill Embankment in Heilongjiang Main Stream Project

吹填土固结特性及固结沉降对地基的稳定性具有重要影响。以黑龙江干流工程吹填砂性土为研究对象,对现场土样进行了压缩试验和剪切试验,研究吹填土在排水固结过程中的沉降变化规律。结果表明:吹填砂性土在高含水率状态下会发生较大的沉降变形,随着含水率的降低沉降变形会逐渐减小;围压能够改变土体原来的内部结构,使土颗粒间的排列发生变化,并且围压越大,土体的塑性破坏应力越大;吹填砂性土体的沉降变形主要是由土体孔隙水排出引起的,砂性土在高含水率状态下具有较大的压缩变形,导致土体产生过大的沉降变形。

Blow-fill soil consolidation characteristics and consolidation settlement have an important impact on the stability of the foundation.In this paper,taking the sandy blow-fill soil of Heilongjiang main stream project as the research object,compression test and shear test were carried out on the soil samples on the site,and at the same time,the change rule of settlement of blow-fill soil in the process of drainage and consolidation was studied.The results show that the settlement deformation of blow-fill sandy soil will be larger in the state of high water content,and the settlement deformation will be gradually reduced with the reduction of water content;the perimeter pressure can change the original internal structure of the soil body,so that the arrangement of the soil particles changes,and the larger the perimeter pressure is,the larger the plastic destructive stress of the soil body is;the settlement deformation of the blow-fill sandy soil is mainly caused by the pore water drainage of the soil body,and the sandy soil has larger compression deformation in the state of high water content,the soil samples have larger compression deformation,and the sandy soil has larger compression deformation in the process of drainage consolidation in the dry stream project.The sandy soil has large compression deformation under high water content,which leads to excessive settlement deformation of the soil body.