Compressibility of cemented dredged clay at high water content with super-absorbent polymer
Compressibility of cemented dredged clay at high water content with super-absorbent polymer
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高吸水性聚合物胶结疏浚土在高含水率下的压缩性
DOI：
10.1016/j.enggeo.2016.04.036
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发表时间：
2016-06-24
影响因子：
7.4
通讯作者：
Cao, Yu-Peng
中科院分区：
文献类型：
--
作者：
Bian, Xia;Wang, Zhi-feng;Cao, Yu-Peng
采用破坏骨架法和扩展本征压缩线法研究了高含水量下高吸水性树脂（SAP）胶结疏浚土的压缩特性。利用相应养护后含水量w（t）下的水泥土压缩曲线来制定评价土结构破坏的比较依据。水泥土的压缩性可分为两个阶段：屈服前状态，由屈服前状态下的压缩指数C-s定义;屈服后状态，由结构化骨架表示，取决于结构化指数B。试验结果表明，Cs和B与水泥胶结强度（用屈服应力σ '（vy）表示）和养护后含水量w（t）直接相关，后者随SAP含量、水泥和石灰含量以及初始含水量而变化。在多元回归分析的基础上，提出了Cs和B与σ '（vy）、后养护w（t）和W-L的相关性。据此，提出了一种估算高含水量水泥土全压缩曲线的简便方法。预测结果与试验结果吻合较好，表明该方法可为规划阶段或工程实践提供一个合理的一阶压缩性估算方法。(C)© 2016 Elsevier B. V.版权所有。
This paper presents an investigation of the compression behaviour of cemented dredged clay at high water content with super-absorbent polymer (SAP) using the destructuring framework and the extended intrinsic compression line (EICL). The compression curve of cemented clay at the corresponding after-curing water content w(t) is used to formulate the comparison basis for evaluating the destructuring of the soil structure. The compressibility of cemented clay can be divided into two stages: pre-yield state, which is defined by the compression index at pre-yield state C-s, and post-yield state, which is represented by the destructuring framework, depending on the destructuring index, b. Test results reveal that Cs and b directly correlate with the degree of the cementation bond, represented by the yield stress sigma'(vy), and the after-curing water content w(t), which varies with the SAP content, the cement and lime content and the initial water content. Based on multiple regression analysis, the correlations of Cs and b with sigma'(vy), the after-curing w(t) and W-L are proposed. Accordingly, a simple method for assessing the complete compression curve of cemented clay at high water content with SAP is suggested. The prediction agrees well with the experiment results, which implies that this method provides a rational first-order estimation of the compressibility of cemented clay with SAP during planning stage or in engineering practice. (C) 2016 Elsevier B.V. All rights reserved.