摘要
吹填淤泥是典型的由水力吹填形成的欠固结沉积软土,因此常选用真空预压法对其进行加固。由于吹填淤泥缺乏稳定的土骨架结构,在真空预压过程中土颗粒发生大范围的流动。随着颗粒流动的发生,土体孔隙结构产生不均匀分布,并且排水板周围形成相对密实和弱透水性的"土柱"。文中利用离散元方法,数值模拟真空预压过程中吹填淤泥地基固结过程,研究固结后土体孔隙率的不均匀变化随多个因素的变化规律。其次,依据数值模拟的结果提出一种新的真空固结吹填淤泥地基的施工工艺。该施工工艺通过调整打设排水板的步骤提高真空预压固结的效率。
In order to deal with the contradiction between the supply and demand of land resources,the shortage of sand sources in some areas and the way out of dredged silt,it is a suitable method to select silt dredger for earth reclamation. The dredged silt is a typical unconsolidated sedimentary soft soil formed by hydraulic dredging,so it is often reinforced by vacuum preloading which is an effective method to reinforce the dredger fill. Due to the lack of soil skeleton,a large range of particle flow occurs during the vacuum preloading process,which leads to the inhomogeneous distributed of the pore structure. Gradually,a ＂soil column＂with high density and low permeability is formed around the drainage plate. In this paper,the consolidation process of the dredger fill during the vac-uum preloading is simulated by the discrete element method（ DEM）,and the influences of various factors on the inhomogeneity of porosity are discussed. Besides,a new construction technology for the reinforcing dredger fill by the vacuum preloading method is proposed according to the numerical simulation results,which improves the efficiency by adjusting the setting steps of drainage plates.
作者
习志雄
杨贝贝
XI Zhixiong;YANG Beibei(China First Highway Engineering Co.Ltd.,Beijing 100024,China;Beijing Urban Construction Design ＆ Development Group Co.Ltd.,Beijing 100037,China)
出处
《水利与建筑工程学报》
2018年第5期153-156,共4页
Journal of Water Resources and Architectural Engineering
关键词
软土地基
吹填淤泥
真空预压
离散元法
非均匀性
soft soil foundation
dredger fill
vacuum preloading
discrete element method
inhomogeneous
