| 总磷对黏土物理力学性质影响的试验研究 |
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| 引用本文： | 伍艳,任海平,王玮屏,兰雁,沈细中.总磷对黏土物理力学性质影响的试验研究[J].岩土力学,2014,35(10):2823-2830. |
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| 作者姓名： | 伍艳 任海平 王玮屏 兰雁 沈细中 |
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| 作者单位： | 1. 黄河水利委员会黄河水利科学研究院，郑州 450003；2. 水利部堤防安全与病害防治工程技术研究中心，郑州 450003； 3. 黄河勘测规划设计有限公司，郑州 450003 |
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| 基金项目： | 国家自然科学基金(No.51309114)；“十二五”国家科技支撑计划(No.2013BAC05B01)。 |
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| 摘 要： | 通过室内试验，考察了去离子水及不同浓度总磷溶液对黏土物理力学性质的影响，并通过土体矿物成分含量及微观形貌分析，对总磷溶液与黏土作用机制进行了初步探讨。结果表明，总磷对土体物理力学性质影响明显：黏土塑性指数随着总磷溶液浓度的增大而减小，有效黏聚力先增大后减小，有效内摩擦角则随着溶液浓度的增大而增大；各浸泡条件下，黏土应力-应变关系曲线变化规律基本一致，均呈应变硬化现象，土体剪切峰值随总磷溶液浓度的增大先增大后减小；总磷溶液与土体间相互作用主要包括离子交换作用、胶结作用及微生物分解作用，并同时受到孔隙液介电常数及黏滞性的影响，这些作用通过改变黏土的矿物成分含量，使其微观形貌及孔隙特征发生明显变化，最终导致土体的宏观力学特性改变。
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| 关 键 词： | 总磷 物理力学性能 矿物成分 微观结构 机制 |
| 收稿时间： | 2013-12-16 |
Experimental study of the effect of total phosphorus on physico-mechanical performance of clays |
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| WU Yan,REN Hai-ping,WANG Wei-ping,LAN Yan,SHEN Xi-zhong.Experimental study of the effect of total phosphorus on physico-mechanical performance of clays[J].Rock and Soil Mechanics,2014,35(10):2823-2830. |
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| Authors: | WU Yan REN Hai-ping WANG Wei-ping LAN Yan SHEN Xi-zhong |
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| Institution: | 1. Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China; 2. Research Center on Levee Safety and Disaster Prevention of Ministry of Water Resources, Zhengzhou 450003, China; 3. Yellow River Engineering Consulting Co., Zhengzhou 450003, China |
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| Abstract: | In order to find the effect of total phosphorus on physico-mechanical performance of clay, samples have been tested with deionized water and total phosphorus solution with different concentrations in laboratory, and the interaction mechanisms of clays and total phosphorus are revealed by mineral and microscopic analysis. The results make clear that the total phosphorus has significant influences on physico-mechanical performance of clay: the plasticity indices of samples decrease with the increasing concentration of total phosphorus solution, the effective cohesive strength increases and then decreases, and the effective friction angle increases with the increasing concentration; the strain hardening phenomenon appears in the stress-strain relationships, and the variation of stress-strain curve of samples soaks in deionized water and total phosphorus solution is almost the same. The peak shear strength of samples manifests as a trend of increase and then it decreases with the increasing concentration of total phosphorus solution. The mineral composition, microstructure and physico-mechanical performance of clays are affected by the interaction between total phosphorus and clays, including ion exchange, cementation, microbial decomposition as well as the dielectric constant and viscosity of pore solutions. |
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| Keywords: | total phosphorus physico-mechanical performance mineral composition microstructure mechanism |
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