重塑黄土饱和与固结时间三轴试验研究  

TRIAXIAL TEST ON SATURATION AND CONSOLIDATION OF REMOULDED LOESS

作　　者：谌文武[1,2] 刘伟[1,2] 孙冠平[1,2] 毕骏 张帅[1,2] 陈鹏飞[1,2] 

机构地区：[1]兰州大学土木工程与力学学院,兰州730000 [2]西部灾害与环境力学教育部重点实验室,兰州730000

出　　处：《工程地质学报》2014年第5期839-844,共6页Journal of Engineering Geology

基　　金：国家重点基础研究发展计划(973)项目(2014CB744700)资助

摘　　要：饱和黄土三轴试验中,土样饱和及固结过程是否完成对试验结果至关重要。土工试验饱和方法中,通常所使用的抽气饱和是提高土样饱和度的有效方法,但对于重塑马兰黄土样,抽气饱和中试样浸水后会发生结构溃散。因此,土样只能在三轴仪上进行饱和。本研究基于GDS非饱和三轴仪对兰州地区的马兰黄土重塑样进行多次饱和试验与固结试验,提出在GDS三轴仪外压力室外部设置三通接头,将试样顶部和底部接通汇集为同一路径,将饱和路径与排水路径均缩短为原来的一半,可明显缩短试验饱和时间与固结时间,进而实现在土样达到预定饱和度情况下缩短试验总时间的目标。而且,本试验中土样上、下同时进水或排水,也符合土体在自然界真实赋存状态下的饱和与固结过程。经反复验证,该方法在粉质黏土重塑样的三轴试验中使用效果较好。The saturation and consolidation status of soil samples is very important in the triaxial test of saturated loess.The vacuum saturation is a common effective way to saturate samples in the test.It is very difficult to saturate the remoulded loess samples by vacuum saturation which may destroy the structure of remoulded loess.So the remoulded loess samples have to be saturated on the triaxial apparatus.A number of saturation tests and consolidation tests are carried on the unsaturated triaxial apparatus of GDS for remoulded loess at Lanzhou.A tee-joint is installed on the triaxial apparetus to cut down the time of saturation test and consolidation test.Also it is a better way to simulate the soils in natural state through up and down to saturate and consolidate.This work contributes to the saturation and consolidation of silty clay in the triaxial test.

关 键 词：三轴试验 反压饱和 固结试验 饱和时间 三通阀门 

分 类 号：P642[天文地球—工程地质学]