含排水砂垫层地基平面应变固结试验  

Experiment of plane-strain ground consolidation with drainage sand cushion

作　　者：高翔[1,2] 王创[1,2] 周星辰[1,2] 赵文博[1,2] 雷国辉[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学江苏省岩土工程技术工程研究中心,江苏南京210098

出　　处：《南京工业大学学报（自然科学版）》2017年第2期102-106,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51278171);中央高校基本科研业务费专项资金(2015B06014;2015B25914)

摘　　要：针对含水平排水砂垫层地基的平面应变固结问题,自主研制了一套平面应变固结试验装置,开展饱和重塑黏土上覆不同长度和渗透系数的砂垫层条件下的固结试验,自动量测固结过程中土体超静孔隙水压力和表面沉降量的变化,分析砂垫层长度和渗透系数对土体固结速率的影响。结果表明:固结速率并不仅仅取决于砂垫层的渗透系数,砂垫层的长度也是影响地基固结速率的重要设计参数。砂垫层越长,则地基固结速率越慢,固结完成所需要的时间越长,其原因在于,砂垫层的长度决定了土堤等工程平面应变固结中水平向渗流路径的长短。A plane-strain consolidation test apparatus was developed to investigate the plane-strain consolidation problem of ground with horizontal drainage sand cushion.Consolidation tests were carried out on saturated remoulded clay overlaid by sand cushions with different lengths and hydraulic conductivities.Variations of excess pore-water pressure and surface settlement of soil were automatically measured during the process of consolidation.The effects of the length and hydraulic conductivity of sand cushion on consolidation were analyzed.Results showed that the rate of consolidation was not only dependent on the hydraulic conductivity of sand cushion.The length of sand cushion was also an important design parameter influencing the rate of consolidation of soil.The longer the sand cushion was the slower the rate of ground consolidation was and the longer the time was required to complete the consolidation.The reason is that the length of sand cushion controls the horizontal seepage path in the plane-strain consolidation in projects such as embankment engineering.

关 键 词：砂垫层 渗透系数 平面应变固结试验 渗流路径 固结速率 

分 类 号：TQ028.8[化学工程]