考虑Klinkenberg效应的压实膨润土渗气特性研究  

Gas permeability of compacted bentonite considering Klinkenberg effect

作　　者：秦冰[1,2] 陆飏 张发忠[1] 陈正汉[1] 刘月妙[3] 王驹[3] 

机构地区：[1]后勤工程学院国防建筑规划与环境工程系,重庆401311 [2]西南科技大学核废物与环境安全国防重点学科实验室,四川绵阳621010 [3]核工业北京地质研究院,北京100029

出　　处：《岩土工程学报》2016年第12期2194-2202,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(11502299,11272353);核废物与环境安全国防重点学科实验室开放基金项目(13zxnk03)

摘　　要：利用非饱和三轴渗气仪研究了压实高庙子膨润土的渗气特性。发现当渗气系数小于10^(-14) m^2时,压实膨润土中的Klinkenberg效应较为显著,渗气系数会随气压力的增大而降低;气体滑脱因子随Klinkenberg渗气系数与体积含气率之比的变化满足幂函数关系,试验得到的二者之间关系与干密度、含水率无关,并与Klinkenberg理论模型相近;Klinkenberg渗气系数与体积含气率在双对数坐标中呈线性关系,其斜率与含水率基本无关。基于试验规律,建立了考虑Klinkenberg效应的高庙子膨润土非饱和渗气系数的数学模型。The gas permeability of compacted GMZ bentonite is studied using the triaxial gas pcrmeameter. It is found that the Klinkcnbcrg effect exists when the gas permeability is lower than I0＂14 m2. A power relationship is observed between the Klinkcnbcrg slippage factor and the ratio of the Klinkenberg permeability to the air-filled porosity. The relationship is independent on dry density and water content, and is almost identical with the Klinkenbcrg model. In the double-log scales, there is a linear relationship between the Klinkenberg permeability and the air-filled porosity, of which the slope is almost independent on water content. Based on the test results, a model for unsaturated gas permeability is proposed, in which the Klinkcnberg effect is taken into account.

关 键 词：膨润土 渗气特性 Klinkenberg效应 高放废物 

分 类 号：TU43[建筑科学—岩土工程]