吴珺华, 叶婷婷, 旷聿涵. 土工膜覆盖下边坡土体水分分布及变化规律研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(4): 66-72. DOI: 10.3969/j.issn.1001-4926.2017.04.011
引用本文: 吴珺华, 叶婷婷, 旷聿涵. 土工膜覆盖下边坡土体水分分布及变化规律研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(4): 66-72. DOI: 10.3969/j.issn.1001-4926.2017.04.011
WU Jun-hua, YE Ting-ting, KUANG Yu-han. Distribution and Change Laws of Soil Water Content of Slope Under the Coverage with Geo-membrane[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(4): 66-72. DOI: 10.3969/j.issn.1001-4926.2017.04.011
Citation: WU Jun-hua, YE Ting-ting, KUANG Yu-han. Distribution and Change Laws of Soil Water Content of Slope Under the Coverage with Geo-membrane[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(4): 66-72. DOI: 10.3969/j.issn.1001-4926.2017.04.011

土工膜覆盖下边坡土体水分分布及变化规律研究

Distribution and Change Laws of Soil Water Content of Slope Under the Coverage with Geo-membrane

  • 摘要: 基于非饱和土渗流原理,采用有限元程序分析了土工膜铺设范围和方式对边坡土体水分分布的影响规律。结果表明:对粉土边坡而言,坡顶后缘完全被膜覆盖时,边坡土体含水率的变化幅度最小。坡脚前缘膜的覆盖范围对边坡土体含水率的影响并不明显,其变化幅度较大;土工膜边缘采用包边处理后,坡肩土体的含水率变化幅度呈减小趋势。包边深度基本不影响土体含水率;阶梯形包边处理的边坡土体含水率变化幅度要小于直线形包边处理的。对粘土边坡而言,土工膜不同覆盖范围对坡肩处土体含水率的影响很小;而坡脚处土工膜覆盖范围的不同对该处土体含水率有一定影响,随着时间的推移,土体含水率呈现先减小后增大的趋势。膜的覆盖范围越小,土体含水率的增长趋势越明显。这表明,土工膜在坡顶后缘的覆盖范围对控制边坡土体含水率的变化幅度至关重要。相同条件下,阶梯形的土工膜铺设方式比直线形的效果要好,包边铺设比未包边铺设的效果要好。

     

    Abstract: Based on the principle seepage of unsaturated soil, the effects of covering areas and ways on distribution and change laws of soil water content of slope were carried out by FEM. For the silty slope, the rangeability of soil water content was the lowest when the rear edge of slope top was covered totally by geo-membrane. The covering areas at the front edge of slope toe had little effect on soil water content and its rangeability is large. The rangeability of soil water content at slope shoulder was decreased if the edges of geo-membrane were wrapped. The wrapped depth of geo-membrane had little effect on the soil water content. The rangeability of soil water content with stepped side-wrap was less than the rangeability with the way of linear side-wrap. For the clay slope, the different covering areas had little effect on the soil water content at slope shoulder. The different covering areas at slope toe had a certain effect on the soil water content. The soil water content decreased first and the incerased as time goes on. The less the geo-membrane covered, the more the soil water content increased. The covering areas at rear edge of slope top are very important to control the rangeabiliby of soil water content. The effect of covering way with stepped side-wrapped is better than the way with linear side-wrapped. The effect of covering with side-wrap is better than the effect of covering without side-wrap.

     

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