Helical filter paper technique for uniform distribution of injected moisture in unsaturated triaxial specimens
Helical filter paper technique for uniform distribution of injected moisture in unsaturated triaxial specimens
复制标题
DOI：
10.1016/j.sandf.2015.06.008
复制
发表时间：
2015-08-01
影响因子：
3.7
通讯作者：
Uchimura, Taro
中科院分区：
文献类型：
--
作者：
Irfan, Muhammad;Uchimura, Taro
在恒定总应力条件下，通过在初始非饱和试样中注水，再现了降雨引起的边坡破坏过程中土单元所经历的场应力路径。三轴试件底部附近注入水分的累积导致试件的不均匀性，从而导致渐进破坏。提出了在试件周围缠绕螺旋形滤纸，使注入水均匀分布的新思路。进行了注水实验，并在恒定剪切应力下比较了有和没有滤纸存在的试样的行为。螺旋滤纸的使用保证了注入水分的更均匀分布，并且使水分沿着试件高度的差异减小了约50%。试样水分均匀性的改善也降低了注水实验过程中渐进失效的可能性。螺旋滤纸技术被认为是一个强大的潜力再现雨致滑坡条件在实验室三轴实验。(C)2015年，日本地质学会。Elsevier B.V.制作和主持。保留所有权利。
The field stress path experienced by a soil element during rain-induced slope failures is reproduced by injecting water in an initially unsaturated specimen under constant total stress conditions. The accumulation of injected moisture near the base of triaxial specimens causes non-uniformity in the specimen leading to progressive failure. A new idea of using a helix shaped filter paper wrapped around the specimen's periphery to uniformly distribute the injected water is presented. Water injection experiments were conducted and the behavior of specimens with and without the presence of filter paper was compared under constant shear stress. The use of helical filter paper ensured more uniform distribution of injected moisture, and reduced the discrepancy of moisture along specimen's height by around 50%. Improvement in moisture uniformity of the specimen also reduced the possibilities of progressive failure during water injection experiments. The helical filter paper technique was found to hold a strong potential for the reproduction of rain-induced landslide conditions in laboratory triaxial experiments. (C) 2015 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved.