Chapter 2 Origin of Soil and Grain Size - Particle size distribution curve basics

Basics about particle size distribution curve.
Textbook: Principles of Geotechnical Engineering (9th Edition). Braja M. Das, Khaled Sobhan, Cengage learning, 2018.
Chapter-by-Chapter Playlists (including all videos)
Chapter 2 - Origin of Soil and Grain Size
Chapter 8 - Seepage
• Chapter 8 Seepage (Geo...
Chapter 9 - Effective Stress
• Chapter 9 In Situ Stre...
Chapter 10 - Stresses in a Soil mass
• Chapter 10 Stresses in...
Chapter 11 - Consolidation
• Chapter 11 Compressibi...
Chapter 12 - Shear Strength of Soil
• Chapter 12 Shear Stren...

[@ildefonsodeloria1956]

Hi, I really find your videos useful in supplementing my learnings in our soil mechanics class! Thank you so much!

[@spmitv3126]

What causes change in distribution profile when one has larger particles and their mean is different example the range for one is 1 to 9 and the other 0 to 5.5 and their mean are different

[@abdomuse9953]

what do I do if there is no corresponding value for D10? how do I calculate the coefficient of uniformity in this case

[@ameliachaerani1544]

What information we can conclude from calculating the coefficient of gradation?

[@uSeeGeo]

Cc is the curvature of the PSD curve and is used to determine if soil is well-graded (1

[@luisSilva-cy7jg]

very good, thanks for this info, thanks👍👍

[@kennison8190]

do we always just 'guess' the values of D10, D30, & D60 based from the PSD graph? is it possible to calculate for the exact values of D10, D30, & D60?

[@uSeeGeo]

The easiest way is to read those values directly from the graph. Alternatively, you could use interpolation of adjacent data points to get the value.

[@kennison8190]

@@uSeeGeo Got it. Thanks!

[@tsanakas83]

Are there any other parameters we can calculate? when do we work with mm and when do we work with φ?

[@uSeeGeo]

Not much except different D# values. Particle sizes are typically given in mm.