Effect of compaction method on the undrained strength of fiber-reinforced clay
Effect of compaction method on the undrained strength of fiber-reinforced clay
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DOI：
10.1016/j.sandf.2018.02.013
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发表时间：
2018-04-01
影响因子：
3.7
通讯作者：
Alahmad, Mohammad
中科院分区：
文献类型：
--
作者：
Abou Diab, Assile;Najjar, Shadi S.;Alahmad, Mohammad
离散纤维在加固土壤中的应用引起了岩土工程界的兴趣。在涉及纤维增强粘土的实验研究中存在两个局限性。首先，纤维增强粘土试样通常在实验室中使用传统的“冲击”压实来制备，而现场粘土系统的压实通常涉及“捏合”作用。其次，文献中报道的大多数测试都使用合成纤维，排除了其他类型的纤维。本文通过一个实验三轴测试程序来解决这些限制：（1）补充了文献中关于用“天然”纤维增强的粘土的不排水荷载响应的稀缺数据，并通过“揉捏”压实，（2）评估了涉及“冲击”压实的实验程序的能力，以产生与实际现场条件相关的响应。从73不固结不排水三轴试验的结果表明，在不排水强度的纤维增强粘土的百分比改善是高度依赖于压实方法，与标本，使用冲击压实产生的改进高达三倍以上，比相同的标本，通过揉捏制备。这种行为的差异可以追溯到通过冲击和捏合压实的试样之间的纤维取向分布的差异。(C)2018年由Elsevier B.V.代表日本岩土学会制作和主办。
The use of discrete fibers in reinforcing soils is of interest to the geotechnical engineering community. Two limitations exist in experimental studies involving fiber-reinforced clays. First, fiber-reinforced clay specimens are generally prepared in the lab using conventional "impact" compaction, whereas the compaction of clay systems in the field typically involves "kneading" action. Second, the majority of tests reported in the literature use synthetic fibers to the exclusion of other types. This paper addresses these limitations through an experimental triaxial testing program that: (1) supplements the scarce data available in the literature on the undrained load response of clays reinforced with "natural" fibers and that are compacted by "kneading", and (2) assesses the capacity of the experimental procedures that involve "impact" compaction to produce responses that are relevant to actual field conditions. Results from 73 unconsolidated undrained triaxial tests indicate that the percent improvement in the undrained strength of the fiber-reinforced clay is highly dependent on the compaction method, with specimens that are prepared using impact compaction yielding improvements up to three times larger than identical specimens prepared by kneading. This discrepancy in the behavior can be traced back to differences in the fiber orientation distributions between specimens that were compacted by impact and kneading. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.