| 宁明膨胀土渗透特性试验研究 |
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| 引用本文： | 张锐,郑健龙,杨和平.宁明膨胀土渗透特性试验研究[J].桂林工学院学报,2008,28(1):48-53. |
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| 作者姓名： | 张锐 郑健龙 杨和平 |
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| 作者单位： | 长沙理工大学,公路工程学院,长沙,410076 |
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| 基金项目： | 交通部西部交通建设科技项目(200231800015) |
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| 摘 要： | 为研究宁明膨胀土渗透特性并得到渗流分析所需参数,在了解土性和土体结构特征的基础上,对广西宁明两种膨胀土的原状样和重塑样分别进行了饱和渗透试验、压力板试验和收缩试验,根据试验结果用间接方法得到非饱和膨胀土渗透系数及其随含水量变化规律。结果表明:矿物成分、土体结构对膨胀土的渗透性有一定影响,膨胀性粘土矿物含量越多,渗透系数越低、透水性越差。原状土被扰动重塑后微结构破坏,渗透性大大降低。宁明非饱和膨胀土渗透系数随着含水量减少(基质吸力增大)而急剧减小,渗透系数与含水量之间可以用指数函数拟合。
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| 关 键 词： | 膨胀土 渗透特性 土水特征曲线 VG模型 收缩试验 |
| 文章编号： | 1006-544X(2008)01-0048-06 |
| 修稿时间： | 2007年1月18日 |
Permeability Test of Ningming Expansive Soil |
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| ZHANG Rui,ZHENG Jian-long,YANG He-ping.Permeability Test of Ningming Expansive Soil[J].Journal of Guilin University of Technology,2008,28(1):48-53. |
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| Authors: | ZHANG Rui ZHENG Jian-long YANG He-ping |
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| Abstract: | Based on the known soil properties and the characteristics of soil structure,saturated permeability test,pressure plate test and shrinkage test are conducted on undisturbed and remolded samples of two types of expansive soil.By testing and indirect method,the permeability coefficient of the unsaturated expansive soil and its variation with moisture content are obtained.The study shows that minerals and soil structure influence the permeability of expansive soil.The more expansive clay mineral,the lower the permeability.Permeability greatly decreases after undisturbed soil is remolded and soil microstructure is broken.The permeability coefficient of the Ningming expansive soil sharply decreases with the decrease of moisture content(increase of matric suction).The relation between permeability coefficient and moisture can be fitted by exponential function. |
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| Keywords: | expansive soil permeability soil-water characteristic curve VG model shrinkage test |
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