Influence of pore fluid concentration on water retention properties of compacted GMZ01 bentonite
Influence of pore fluid concentration on water retention properties of compacted GMZ01 bentonite
复制标题
孔隙流体浓度对压实GMZ01膨润土保水性能的影响
DOI：
10.1016/j.clay.2016.05.020
复制
发表时间：
2016-08
影响因子：
5.6
通讯作者：
Cui, Yu-Jun
中科院分区：
文献类型：
--
作者：
Chen, Y. G.;Chen, B.;Ye, B.;Cui, Yu-Jun
高庙子膨润土具有较低的导水率、较高的膨胀能力和良好的吸附性能，可作为我国高放废物地质处置库人工屏障建设的缓冲/回填材料。对初始干密度为1.70 g/cm 3的压实GMZ 01膨润土进行了水化处理。记录膨胀应变。饱和后，进行吸力控制干燥试验，得到相应的土壤持水曲线。采用MIP方法研究了试样在干湿交替过程前后孔隙比的变化。结果表明，压实后的GMZ 01膨润土的膨胀应变随渗滤液浓度的增加而减小。饱和压实GMZ 01膨润土试样的收缩曲线随吸力的变化而变化，可分为正常收缩阶段、残余收缩阶段和零收缩阶段。对于一个给定的吸力，测得的孔隙比的试样饱和蒸馏水是略大于那些饱和的试样与盐溶液干燥平衡后达到。在吸力一定的情况下，压实GMZ 01膨润土试样的饱和度随盐浓度的增加而增加。根据试验结果，提出了考虑孔隙率和盐溶液对干燥特性影响的SWRC修正方程。验证结果表明，该方程能较好地描述压实GMZ 01膨润土在不同溶液饱和下的土水比容。
Due to its low hydraulic conductivity, high swelling capacity and good adsorption properties, the Gaomiaozi (GMZ) bentonite has been proposed as a suitable buffer/backfill material for the construction of artificial barriers in a deep geological repository for the disposal of high-level nuclear waste (HLW) in China. Compacted GMZ01 bentonite with an initial dry density of 1.70 g/cm3was hydrated with distilled water and NaCl solutions. The swelling strain was recorded. After being saturated, suction-controlled drying tests were conducted and corresponding soil water retention curves were obtained. MIP investigations were conducted on the void ratio variation of a specimen before and after experiencing wetting and drying processes. Results show that the swelling strain of compacted GMZ01 bentonite decreases as the concentration of infiltration solution increases. The shrinkage curve of saturated compacted GMZ01 bentonite specimens evolves with controlling suctions and could be divided into three stages including a normal shrinkage stage, a residual shrinkage stage and a zero shrinkage stage. For a given suction, the measured void ratio of a specimen saturated with distilled water is slightly larger than those of specimens saturated with salt solutions after the drying equilibrium is reached. For a given suction, the degree of saturation of a compacted GMZ01 bentonite specimen increases as the salt concentration increases. According to the test results, a modified SWRC equation was proposed to account for the effect of void ratio and salt solutions on drying behaviour. The verified results revealed that the proposed equation can satisfactorily describe the SWRCs of compacted GMZ01 bentonite saturated with different solutions.
登录
查看更多内容
影响因子：
5.8
作者：
DiMaio, C
通讯作者：
DiMaio, C
影响因子：
4.2
作者：
Paul D. Hallett;T. A. Newson
通讯作者：
Paul D. Hallett;T. A. Newson
DOI：
--
发表时间：
2003-07
期刊：
--
影响因子：
--
作者：
C. Mena
通讯作者：
C. Mena
影响因子：
5.3
作者：
Annan Zhou;D. Sheng;Jie Li
通讯作者：
Annan Zhou;D. Sheng;Jie Li
影响因子：
1.5
作者：
J. Rutqvist;D. Barr;J. Birkholzer;M. Chijimatsu;O. Kolditz;Quansheng Liu;Y. Oda;Wenqing Wang
通讯作者：
J. Rutqvist;D. Barr;J. Birkholzer;M. Chijimatsu;O. Kolditz;Quansheng Liu;Y. Oda;Wenqing Wang