| 随机单裂隙饱和/非饱和渗透系数研究 |
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| 引用本文： | 李锦辉,蔡成志.随机单裂隙饱和/非饱和渗透系数研究[J].岩土力学,2012,33(9):2595-2699. |
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| 作者姓名： | 李锦辉 蔡成志 |
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| 作者单位： | 1.哈尔滨工业大学 深圳研究生院 土木与环境工程学院，广东 深圳 518055；2.上海中房建筑设计有限公司，上海 200021 |
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| 基金项目： | 国家自然科学基金(No.51009043);高等学校博士学科点专项科研基金(No.20102302120070);深圳市基础研究计划 |
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| 摘 要： | 裂隙易在降雨作用下诱发滑坡等灾害，裂隙的饱和/非饱和渗透特性是研究此类问题的关键。利用精密数控机床制作随机粗糙裂隙面，并研制了一套仪器进行此随机粗糙裂隙的渗流试验，得到了裂隙的饱和渗透系数，然后通过间接方法预测此裂隙的非饱和渗透系数。研究发现，当裂隙平均开度为0.4 mm时，其饱和渗透系数为0.1 m/s。通过立方定律得到的水力等效隙宽为0.35 mm，小于其平均隙宽。同时裂隙的渗透系数与平均隙宽的平方成正比，这与立方定律的趋势相一致。研究得到了不同隙宽裂隙的非饱和渗透系数函数，当基质吸力小于进气值时，渗透系数为一常数，即为饱和渗透系数；当基质吸力大于进气值时，裂隙板的渗透系数急剧减小。当裂隙板的基质吸力达到其残余含水率对应的吸力值时，裂隙板的渗透系数基本稳定。在此情况下，基质吸力的继续增加对渗透系数的影响非常小，很难使渗透系数减小。
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| 关 键 词： | 裂隙 渗流 渗透系数 非饱和 随机 |
| 收稿时间： | 2012-05-07 |
Study of saturated/unsaturated hydraulic conductivity of a random crack |
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| LI Jin-hui
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CAI Cheng-zhi.Study of saturated/unsaturated hydraulic conductivity of a random crack[J].Rock and Soil Mechanics,2012,33(9):2595-2699. |
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| Authors: | LI Jin-hui CAI Cheng-zhi |
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| Institution: | 1. School of Civil and Environmental Engineering, Shenzhen Graduate School of Harbin Institute of Technology, Shenzhen, Guangdong 518055, China; 2. Shanghai Zhongfang Architectural Design Co., Ltd., Shanghai 200021, China |
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| Abstract: | The presence of cracks can trigger landslide after rainfall.The saturated/unsaturated hydraulic conductivity is a key parameter to study the slope stability.In this research a random crack is made using high-resolution machine.An apparatus is developed to conduct seepage experiment through the random crack;and the saturated hydraulic conductivity of the crack can be obtained.The unsaturated hydraulic conductivity is predicted using the saturated hydraulic conductivity and the soil water characteristic curve.Results show that the saturated hydraulic conductivity is 0.1 m/s when the average aperture of the random crack is 0.4 mm.The hydraulic effective aperture is 0.35 mm,which is smaller than the average aperture.The hydraulic conductivity is proportional to the square of the average aperture,which is consistent with the cubic law.The unsaturated hydraulic conductivity curve shows that the hydraulic conductivity decreases very fast when the matric suction is larger than the air entry value.When the matric suction reaches the suction corresponding to the residual water content the influence of matric suction on the hydraulic conductivity is limited.Finally,the hydraulic conductivity approaches a constant value. |
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| Keywords: | crack seepage hydraulic conductivity unsaturated random |
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