Experimental and Modeling Study of Soil Water Retention Curves of Compacted Bentonite considering Salt Solution Effects
Experimental and Modeling Study of Soil Water Retention Curves of Compacted Bentonite considering Salt Solution Effects
复制标题
考虑盐溶液效应的压实膨润土土壤保水曲线试验与模型研究
DOI：
10.1155/2019/4508603
复制
发表时间：
2019-05
期刊：
影响因子：
1.7
通讯作者：
Wu Dong-yu
中科院分区：
文献类型：
--
作者：
He Yong;Zhang Ke-neng;Wu Dong-yu
由于其低水力传导率、高膨胀能力和良好的吸附性能，高庙子（GMZ）膨润土已被选为潜在的缓冲/回填材料，用于在中国高放核废料（HLW）处置的深层地质处置库中建造工程屏障。研究盐溶液对压实膨润土保水性能的影响对于基于多屏障概念的高放废物地质处置具有重要意义。在本研究中，通过喷射不同浓度的盐溶液分别获得修正样本以达到目标盐含量。采用气相技术进行吸力控制，对不同含盐量的致密GMZ膨润土（1.7 Mg/m3）进行密闭条件下的保水试验。获得了相应的土壤保水曲线（SWRC）。分析表明，对于给定的吸力，GMZ膨润土样品的测量含水量随着盐含量（或孔隙流体浓度）的增加而增加。影响程度取决于吸力。对于较低吸力（低于38MPa），保水能力随着含盐量的增加而增加，而对于较高吸力（高于38MPa），保水能力的影响可以忽略不计。基于 Fredlund 和 Xing (1994) 方程，提出了一种土壤保水模型，用于模拟压实 GMZ 膨润土的 SWRC，并考虑了孔隙流体化学。考虑孔隙流体浓度的影响，分析确定参数。验证表明，该模型模拟的SWRC与实测值吻合较好。
Due to its low hydraulic conductivity, high swelling capacity, and good adsorption properties, the Gaomiaozi (GMZ) bentonite has been selected as potential buffer/backfill materials for construction of engineered barriers in the deep geological repository for disposal of high-level nuclear waste (HLW) in China. Investigation of salt solution effects on the water retention properties of compacted bentonite is of great importance in the context of geological disposal of HLW based on the multibarrier concept. In this study, amended specimens were obtained through a spray of different concentrations of salt solutions to reach target salt contents, respectively. With employment of the vapor phase technique for suction control, water retention tests were conducted on densely compacted GMZ bentonite (1.7 Mg/m3) with different salt contents under confined conditions. Corresponding soil water retention curves (SWRCs) were obtained. Analysis indicates that, for a given suction, the measured water content of GMZ bentonite specimen increases as the salt content (or pore fluid concentration) increases. The influencing rate depends on suction. For lower suctions (lower than 38 MPa), the water retention capacity increases as the salt content increases, while for higher suctions (higher than 38 MPa), the influence can be negligible. Based on the Fredlund and Xing (1994) equation, a soil water retention model was proposed for simulation of the SWRCs of compacted GMZ bentonite with consideration of pore fluid chemistry. Parameters were analyzed and determined with consideration of influences of the pore fluid concentration. Verification indicates that the SWRCs simulated by the proposed model are well agreed with the measured ones.
登录
查看更多内容
孔隙流体浓度对压实GMZ01膨润土保水性能的影响
影响因子：
5.6
作者：
Chen, Y. G.;Chen, B.;Ye, B.;Cui, Yu-Jun
通讯作者：
Cui, Yu-Jun
DOI：
10.1111/j.1755-6724.2008.tb00662.x
发表时间：
2008-10
期刊：
Acta Geologica Sinica ‐ English Edition
影响因子：
--
作者：
Wen Zhijian
通讯作者：
Wen Zhijian
影响因子：
3.6
作者：
T. Hueckel
通讯作者：
T. Hueckel
影响因子：
5.6
作者：
Jacinto, Abel Carlos;Villar, Maria Victoria;Ledesma, Alberto
通讯作者：
Ledesma, Alberto
影响因子：
7.4
作者：
Nam, Soonkie;Gutierrez, Marte;Munoz, Juan Jorge
通讯作者：
Munoz, Juan Jorge