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冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 977-981.doi: 10.7522/j.issn.1000-0240.2016.0112

• 岩土试验与测试技术 • 上一篇    下一篇

细粒含量Pc<25%渗透变形类型为非管涌碎砾石的颗粒级配特征及判别方法

齐俊修1, 赵晓菊1, 刘艳1, 张中炎2, 张广禹3   

  1. 1. 中国电建集团 北京勘测设计研究院有限公司, 北京 100024;
    2. 中水北方勘测设计研究有限责任公司, 天津 300204;
    3. 黄河勘测规划设计有限公司, 河南 郑州 450008
  • 收稿日期:2016-02-03 修回日期:2016-07-13 出版日期:2016-08-25 发布日期:2016-09-19
  • 作者简介:齐俊修(1946-),男,河南睢县人,教授级高级工程师,1970年毕业于同济大学,现从事岩土工程科研试验、监测、治理等方面的工作.E-mail:179326776@qq.com
  • 基金资助:
    中国电建集团北京勘测设计研究院有限公司专题科研项目(ZT2013-09)资助

Particle size distribution characteristics and determination method of crushed gravel with fine content Pc<25% of non-piping permeation deformation type

QI Junxiu1, ZHAO Xiaoju1, LIU Yan1, ZHANG Zhongyan2, ZHANG Guangyu3   

  1. 1. PowerChina Beijing Engineering Corporation Limited, Beijing 100024, China;
    2. China Water Resources Beifang Investigation, Design and Research Co., Ltd., Tianjin 300204, China;
    3. Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450008, China
  • Received:2016-02-03 Revised:2016-07-13 Online:2016-08-25 Published:2016-09-19

摘要: 细粒含量判别法是无黏性粗粒土渗透变形类型主要判别方法,但细粒含量Pc<25%渗透变形类型为流土和过渡的碎砾石,其渗透变形类型不符合细粒含量判别准则.通过对46个工程310个试样(其中Pc<25%的试样数214个),渗透变形试验结果统计分析发现,该类土虽然仅占同级配段(Pc<25%)比例为6.1%,但其颗粒级配曲线均具有独特特征,即各粒径级颗粒含量均较均匀,即Cu均大于5,Cc多数为1.0~3.0之间,即该类土大多数为优良级配,进一步分析发现其D15/d85之比均小于等于5,进而提出用D15/d85≤5作为判别该类土的方法.

关键词: 碎砾石, 细粒含量, Pc<25%, 渗透变形类型, 流土, 过渡, 非管涌, D15/d85

Abstract: Fine grain content criterion is a main discriminant method for the seepage deformation type of cohesionless coarse grained soil, however the seepage deformation types of fine grain content (Pc<25%) are the soil flow and transitional crushed gravel, which do not conform to the fine grain content criterion. According to the statistical analysis on seepage deformation testing results with 310 specimens from 46 projects (in which, the number of samples (Pc<25%) is 214), although this kind of soil accounts for 6.1% in the same graded section (Pc<25%), the grain grading curves have such an unique characteristic that the grain content of each particle size is uniform. The values of Cu are larger than 5, and most values of Cc are within 1.0-3.0, so this kind of soil are mostly well-graded. Further analysis shows that the ratios of D15/d85 are less than or equal to 5, therefore the D15/d85≤5 is taken as a discriminant method for this kind of soil.

Key words: crushed gravel, fine grain content, Pc<25%, types of seepage deformation, soil flow, transition, non-piping, D15/d85

中图分类号: 

  • P642