| 砂砾石土的管涌临界渗透坡降预测方法 |
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| 引用本文： | 吴梦喜,高桂云,杨家修,湛正刚.砂砾石土的管涌临界渗透坡降预测方法[J].岩土力学,2019,40(3):861-870. |
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| 作者姓名： | 吴梦喜 高桂云 杨家修 湛正刚 |
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| 作者单位： | 1. 中国科学院力学研究所，北京 100190；2. 中国科学院大学，北京 100049；3. 中国地震局地壳应力研究所，北京 100085；
4. 中国电建集团贵阳勘测设计研究院有限公司，贵州 贵阳 550081 |
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| 基金项目： | 国家重点基础研究发展计划课题（No.2013CB035903）；国家科技支撑计划课题（No.2014BAB03B04）；华能科技项目（No.NHKJ15-H13） |
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| 摘 要： |
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| 关 键 词： | 管涌 内部稳定性 砂砾石土 临界渗透坡降 |
| 收稿时间： | 2017-08-25 |
A method of predicting critical gradient for piping of sand and gravel soils |
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| WU Meng-xi,GAO Gui-yun,YANG Jia-xiu,ZHAN Zheng-gang.A method of predicting critical gradient for piping of sand and gravel soils[J].Rock and Soil Mechanics,2019,40(3):861-870. |
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| Authors: | WU Meng-xi GAO Gui-yun YANG Jia-xiu ZHAN Zheng-gang |
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| Institution: | 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. The Institute of Crustal Dynamics, China Seismological Bureau, Beijing 100085, China;
4. Powerchina Guiyang Engineering Corporation Limited, Guiyang, Guizhou 550081, China |
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| Abstract: | Fine particles in an internally unstable sand and gravel soil may be washed out under seepage, thus the bearing capacity of a dam foundation with those sand and gravel soil layers reduces. The determination of critical piping permeability gradient of gravel soil on dam foundation is an important step in dam design and seepage prevention safety analysis. In this paper, the prediction of the critical vertical upward hydraulic gradient of piping in sand and gravel soils were developed based on the force balance theory of a single particle or a group of particle under seepage. Based on 64 groups of vertical upward piping tests of gravel soils in literatures, Kenney-Lau stability criterion method and Kezdi particle size ratio method were used to analyze the internal stability of gravel soils. The results show that the proposed method is an effective method to access the internal stability of gravel soils using particle gradation curve. By comparing the predictions of critical permeability gradient with the experimental results of 41 groups of sand-gravel soils, it is a reasonable assumption that the permeability of particles in sand-gravel soils under seepage is proportional to the surface area of particles . |
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| Keywords: | piping internal stability sand and gravel soil critical gradient |
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