GCTS空心圆柱扭剪仪反压饱和试验探究  

Experimental Study on the Back Pressure Saturation Method by GCTS Hollow Cylinder Apparatus

作　　者：王腾辉[1,2] 赵瑞斌[1,2] 张彦[1,2] 

机构地区：[1]天津城市建设学院土木工程学院,天津300384 [2]天津市软土特性与工程环境重点实验室,天津300384

出　　处：《岩土工程技术》2012年第2期82-85,共4页Geotechnical Engineering Technique

基　　金：天津市科技计划项目(06YFGZSF04000)

摘　　要：GCTS空心圆柱扭剪仪是研究土体在循环荷载下的主应力轴旋转的理想仪器。如何使用GCTS空心圆柱扭剪仪对软土空心试样进行反压饱和才能使后续试验结果更精确,探究了以GCTS空心圆柱扭剪仪为试验平台,对空心试样进行了反压饱和的试验方法。总结了空心扭剪仪反压饱和的3种加压方式:手动加压、自动加压和连续加压方式。通过一些试验探究了每种加压方式所对应的合理性参数。确定了适合吹填土的压差为15kPa。确定了孔压稳定的标准为:如果孔压在1min内的变化值小于围压和反压之间压力差的5%,则认为孔压稳定。GCTS Hollow Cylinder apparatus is the best tool to study the soil behavior under the principal stress rotation. In the whole process of torsional shear test, saturation of specimen is prerequisite and the success of the samples saturated also is the key. Taking GCTS hollow cylinder apparatus as a testing platform, the back pressure method is used to saturate hydraulic fill fully. The apparatus provides 3 ways to increase confining pressure and back pressure, i. e. manual stepping, automatic stepping and continuous ramping. Through some experiments, each compression of the corresponding parameters reasonable is explored. 15kpa differential pressure be adequate for hydraulic fill. The standards of pore pressure stability.. If the changes of porepressure in one minute is less than the 5%of difference between the cell pressure and the back pressure, the pore pressure is considered stable.

关 键 词：空心扭剪 吹填土 反压饱和 

分 类 号：TU413[建筑科学—岩土工程]