崔济东的博客 – JiDong Cui's Blog

分享一个小程序。  A small program to share with you.

• 程序图标 ( Program Icon )

• 程序介绍 ( Program Introduction)

To identify grain size characteristics of soils, grain size distribution curve is developed. First, sieve analysis is conducted. A variety of sieves with different openings are stacked, with the largest opening sieve on the top and smaller on the lower sections. When a relatively large percent passing through the sieve with 0.075mm opening (e.g., more than 10% as a guideline) is obtained from the sieve analysis, a hydrometer analysis is conducted.

This program process the raw data from sieve analysis and hydrometer analysis to get the  grain size distribution curve and other parameters like D10, D30, D50, D60, Cu and Cc.

D10: effective grain size, the diameter of the soil particles for which 10% of the particles are finer.

D30: the diameter of the soil particles for which 30% of the particles are finer.

D50: mean grain size, the diameter of the soil particles for which 50% of the particles are finer.

D60: the diameter of the soil particles for which 60% of the particles are finer.

Cu: coefficient of uniformity, defined as  Cu = D60/D10.

Cc: coefficient of curvature (other terms used are the coefficient of gradation and the coefficient of concavity) defined as Cc = D30*D30/ D60/ D10 .

The coefficient of uniformity and the coefficient of gradation affect the soil packing arrangement.

• 程序界面 ( Program Interface )

• 例子   ( Example )

Import raw data from excel

Check Results

• 程序下载( Program Download)

( 如果有需要这个软件，请在评论栏留下您的评论，软件将通过邮箱给您发送。如果你发现软件有bug或者软件使用有问题，请联系我！）  ( This app is free . If you want this program, leave your comment on the comment region, and the program will be sent to you through Email. If  you have found any bug in the program or have any problem when using the program, please don’t hesitate to contact me directly.  )

• 注释 ( Comments )

  ( 如果您发现有错误，欢迎批评指正。邮箱：jidong_cui@163.com . 如果您喜欢这篇博文，请在上面给我 点个赞 吧！     

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小白学设计系列~~~    工作之余，休息一下，闲聊几笔，也算是整理一下知识吧，都是很简单的东西，请大师不要见笑，请大师们指点。    

• 出品人[Authors] : 崔济东 (Jidong Cui)；沈雪龙 ( Xuelong Shen ).

• 题目[Title] : 土力学有效应力之雨天防滑

有效应力原理是土力学区别于其他力学的一个重要原理，由太沙基（K. Terzaghi）提出，并经Skempton和Bishop改进而被广泛接受。该原理认为饱和土中的压应力由力学效应不同的两部分组成，一部分为孔隙水压力，这部分应力既不产生可觉察的压缩量，也不产生可观的抗剪强度增量，又叫中和应力，另一部分为有效应力，这部分应力对土体能够产生可觉察的变形影响或使土体的抗剪强度增加。公式表示为:

• 注释 ( Comments )

  ( 如果这篇博文有问题，或有错误，请给出指出，欢迎批评指正，给我评论，或给我发邮件，我的邮箱：jidong_cui@163.com . 如果你喜欢这篇博文，请在上面给我 点个赞 吧！     :-)

  ( If  you have any problem about this post, please don’t hesitate to contact me directly.  Email : jidong_cui@163.com. If you like this posts, please give me a “thumbs up“ rating on the button above! )

• 参考文献 ( References)

[01] 太沙基，《理论土力学》

[02] 沈珠江，《理论土力学》

[03] 李广信，《岩坛漫话》

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