| 土体渗透稳定性判定准则 |
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| 引用本文： | 常东升,张利民.土体渗透稳定性判定准则[J].岩土力学,2011,32(Z1):253-259. |
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| 作者姓名： | 常东升 张利民 |
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| 作者单位： | 香港科技大学 土木与环境工程学系，中国 香港 999077 |
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| 基金项目： | 国家自然科学基金海外及港澳学者合作研究基金资助(No.50828901);Research Grants Council of the Hong Kong SAR(No.622207) |
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| 摘 要： | 土体的渗透稳定性是指在渗流条件下宽级配土体内粗颗粒阻止细颗粒流失的能力，土体的渗透稳定性受几何条件、水力条件和物理条件的影响。从几何条件出发，通过对收集的167种土的室内渗透侵蚀试验结果的分析，基于对土体渗透稳定性控制变量地研究，将土分成良好级配土和间断级配土两大类；基于细粒（小于0.063 mm）含量的不同，将每类土又细分为3类，针对不同细类土提出了不同的渗透稳定性几何判定准则。从水力条件出发，研究了应力状态对土体渗透侵蚀起动及破坏水力梯度的影响。试验结果表明，起动水力梯度和破坏水力梯度都随着围压的增大而增大，是由于增大围压使得颗粒间的摩擦力增大的结果。
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| 关 键 词： | 土石坝 渗透稳定性 渗流 侵蚀 大坝安全 |
| 收稿时间： | 2010-12-15 |
Internal stability criteria for soils |
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| CHANG Dong-sheng,ZHANG Li-min.Internal stability criteria for soils[J].Rock and Soil Mechanics,2011,32(Z1):253-259. |
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| Authors: | CHANG Dong-sheng ZHANG Li-min |
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| Institution: | Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong 99907, China |
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| Abstract: | Internal stability refers to the ability for the coarse fraction of a broadly-graded soil to prevent the loss of its fine fraction due to seepage flow. The internal stability of a soil is influenced by geometric conditions (i.e. grain sizes and their distribution and pore sizes and their distribution), hydraulic conditions (i.e. hydraulic gradient and flow direction), and mechanical conditions (i.e. compaction efforts). From the geometric standpoint, soils are classified into two groups: well-graded and gap-graded, based on the information of 167 soils in a laboratory test dataset and understanding on the control variables for internal stability. Each group is further divided into three categories according to the fines content (< 0.063 mm). Finally, new internal stability criteria for each category of well-graded and gap-graded soils are proposed. From the hydraulic point of view, the influence of complex stress states on the initiation and development of seepage erosion is investigated. It is found that both the initiation hydraulic gradient and the failure hydraulic gradient increase with confining pressure. This is mainly due to the increase of friction between particles. |
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| Keywords: | embankment dam internal stability seepage erosion dam safety |
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