ZHOU Ming-tao,YANG Ping,HU Huan,et al.Experimental Study on Freezing and Thawing Actions of Vegetation-growing Concrete Ecological Base Material[J].Research of Soil and Water Conservation,2013,20(02):282-287.
植被混凝土生态基材冻融效应试验研究
- Title:
- Experimental Study on Freezing and Thawing Actions of Vegetation-growing Concrete Ecological Base Material
- Keywords:
- water content; freezing end temperature; thawing temperature; plant generate; vegetation-growing concrete
- 分类号:
- TU443
- 摘要:
- 以植被混凝土生态基材为研究对象，探讨了冷端温度、含水率、植生土类型及融化温度4个因素对其冻融效应的影响。结果表明：各因素对植被混凝土冻融效应影响的强弱顺序为植生土类型 > 含水率 > 冷端温度 > 融化温度；随冷端温度升高或含水率增大，植被混凝土的冻胀率与融沉系数均显著增大；其它条件都相同时，黏土配置的植被混凝土在冻融效应上比砂土表现的更为敏感；融化温度对植被混凝土融沉系数的影响微弱，且无规律可循；冻胀与融沉过程对植被混凝土耐久性的破坏主要体现在内部的微观结构上，冻融双重作用对植被混凝土的体积变化影响并不显著；以冷端温度和含水率为影响因素所建立的综合预报模型拟合度好，可有效预测植被混凝土冻胀与融沉变形量。
- Abstract:
- As the experimental research object, the vegetation-growing concrete ecological base material was taken to study its freezing and thawing actions caused by freezing end temperature, water content, soil type and thawing temperature. The results showed that the sequence of influence factors on the vegetation-growing concrete freezing and thawing actions from strong to weak level was soil type, water content, freezing end temperature and thawing temperature. The frost heave ratio and thawing settlement coefficient of the vegetation-growing concrete increased significantly with the rise of freezing end temperature or water content. Under the same conditions, the freezing and thawing actions of the vegetation-growing concrete composed with clay is more sensitive than that composed with sand. The impact of thawing temperature on the vegetation-growing concrete thawing settlement coefficient was very weak, and it was no rules to be observed. There were little changes in volume after a complete process of frost heave and thawing settlement, while the durability of the vegetation-growing concrete was mainly revealed through the internal microstructure. The comprehensive prediction models set up with freezing end temperature and water content had good fitting degree, which may effectively predict distortions when the vegetation-growing concrete was exposed to the condition of frost heave and thawing settlement.
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备注/Memo
收稿日期:2012-09-09;改回日期:2012-10-13。
基金项目:三峡大学博士启动基金“植被混凝土生态基材胀缩恢复性研究”（KJ2011B006）
作者简介:周明涛(1979-),男,湖北保康人,博士,主要从事边坡生态防护及植被修复技术方面的研究。E-mail:zmt@ctgu.edu.cn