大尺寸软粘土固结变形试验研究  

Research on Consolidation Deformation Test of Large-Size Soft Clay Samples

作　　者：周翠英[1] 曾强[2] 李亚生[1] 

机构地区：[1]中山大学应用力学与工程系∥地下工程与信息技术研究中心,广东广州510275 [2]广东省电力设计研究院,广东广州510280

出　　处：《中山大学学报（自然科学版）》2005年第5期25-29,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(59809008)广东省自然科学基金重点资助项目(013188)广东省科技攻关十五专项(2001B30903)广东粤东高速公路实业发展有限公司资助项目(2004-3000-7101043)

摘　　要：针对常规室内试验的局限性,设计了软粘土天然土样和重塑土样的大尺寸固结变形试验。试验中荷载的大小与实际土体的受力条件按同比缩小;土样侧限条件设计为具有弹塑性特点的有机玻璃板,板内贴有渗透系数与淤泥质土渗透系数相近的滤纸,板上模拟土体边界渗流条件开一定密度的细小排水孔,土样的尺寸为20 cm×20 cm×20 cm,30 cm×30 cm×30 cm和40 cm×40 cm×40 cm三种规格;整个实验过程尽可能地反映土体实际的受力环境;在试验基础上,探讨了一定压力下,大尺寸软粘土的固结变形规律及其数学模型,讨论了其尺寸效应。同时,将所建立的沉降计算模型推广为广义的实际土体变形模型,并在深圳国际机场软基沉降预测中进行了初步应用,取得了较好的效果。Due to the limits of routine chamber consolidation test, a new large-size consolidation test for the natural soil samples and remolded ones of soft clay am designed in which the loads am reduced according to a certain scale to actual ones. The four sides around soil samples are designed as elastic and plastic boundary with organic glass material on which distributed many small drainage holes according to a certain density so as to simulate the seepage condition of the boundary of sample. The sizes of soil samples am much bigger than that of the routine ones, such as 20 cm × 20 cm ×20 cm, 30 cm ×30 cm ×30 cm and 40 cm × 40 cm ×40 cm. The process of experiment should be well reflecting the stress environment and deformation regularity as much as possible, then the consolidation deformation regularities am studied. The settlement model of large sized soft clay samples under some certain pressures is built, and the size effect of the deformation of soft clays is discussed. The mathematical model for the calculation of settlement of soft clay is extended to a general one for the calculation of soils in natural cases by considering the size effect. By applying this model to the prediction of soft ground in Shenzhen International Airport, the reliability of the model is testified.

关 键 词：软粘土 大尺寸 固结变形 模拟试验 尺寸效应 

分 类 号：TU471[建筑科学—结构工程]