真空荷载下不同颗粒级配软土真空度传递规律试验研究  

Experimental study on vacuum degree transfer law of soft clay of different grain size grading under vacuum preloading

作　　者：颜永国[1] 

机构地区：[1]中交四航工程研究院有限公司,广东广州510230

出　　处：《水运工程》2010年第10期109-112,共4页Port & Waterway Engineering

摘　　要：采用改进的真空预压试验模型对含砂软土真空度传递进行试验研究,在相同的加载条件下进行了7组不同颗粒级配的试样真空预压室内模型试验,分别从土体的孔隙水压力和膜下真空度方面对不同试样的真空度传递规律进行对比分析,简述含砂软土的颗粒级配对真空度传递的影响。试验结果表明,真空度优先在有较大孔隙的土体传递,含砂量越高,粒径越大,则真空度在土体传递的速度就越快,从而加快孔隙水压力的消散,加快土体固结的速度。By using improved vacuum preloading experimental model,the vacuum transfer law of sandy soft clay are performed.Vacuum preloading indoor experiment of seven sets of samples with different grain size grading are tested under the same test loading condition.Then pore water pressure and under-membrance vacuum are analyzed to study the vacuum degree transfer law of different samples.The effect of grain size grading on the transfer of vacuum degree of sandy soft clay is described briefly.The results show that the vacuum degree transfer in the soil with big porosity preferentially.The higher the sand content and the bigger the particle size,the faster the transfer of vacuum degree,and thus the dissipation of pore water pressure is speeded up and the consolidation speed of soil is accelerated.

关 键 词：真空荷载 颗粒级配 软土 真空度 

分 类 号：TU472[建筑科学—结构工程]