1 / 10

Sources: Soil Mechanics – Laboratory Manual,B.M. DAS (Chapters 9)

Soil Mechanic Laboratory Assist. Lec . Lubna Mohammed Abd Environmental Engineering Department Al- Mustansiriyah University Soil Classification. Sources: Soil Mechanics – Laboratory Manual,B.M. DAS (Chapters 9). Class Outlines. Soil Classification Systems USCS AASHTO USDA

gillispie
Download Presentation

Sources: Soil Mechanics – Laboratory Manual,B.M. DAS (Chapters 9)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Soil Mechanic LaboratoryAssist. Lec. Lubna Mohammed AbdEnvironmental Engineering Department Al- Mustansiriyah UniversitySoil Classification Sources: Soil Mechanics – Laboratory Manual,B.M. DAS (Chapters 9)

  2. Class Outlines • Soil Classification Systems • USCS • AASHTO • USDA • USCS Classification System

  3. USCS Classification System • Originally developed for the United States Army • The method is standardized in ASTM D 2487 as “Unified Soil Classification System (USCS)” • USCS is the most common soil classification system among geotechnical engineers • A typical USCS classification would be: Silty sand with gravel SM - Group Name Group Symbol

  4. Naming Convention • Fine-grained Soil First Letter Second Letter M – Silt L – Low plastic C – Clay H – High plastic O – Organic • Coarse-grained Soil First Letter Second Letter S – Sand P – Poorly graded G – Gravel W – Well graded M – Silty C - Clayey

  5. Classification of Soils • From sieve analysis and the grain-size distribution curve determine the percent passing as the following: • > 3 inch – Cobble or Boulders • 3 inch - # 4 (76.2 – 4.75 mm) : Gravel • # 4 - # 200 (4.75 - 0.075 mm) : Sand • < # 200: Fines • First, Find % passing # 200 • If (5%) or more of soil passes # 200 sieve, then conduct Atterberg Limits test (LL & PL)

  6. FINES GRAVEL SAND GrainSize Distribution Curves Cobbles or Boulders

  7. Classification of Soils • If the soil is fine-grained (≥ 50% passes #200) follow the guidelines for fine-grained soils • If the soil is coarse-grained (<50% passes #200) follow the guidelines for coarse-grained soils • Find % Gravel & Sand • Calculate Cu & Cc • Calculate LL, PL and PI

  8. Fine-grained Soils Civil Engineering - Texas Tech University

  9. Coarse-grained Soils Civil Engineering - Texas Tech University

  10. In your report • Use data from Sieve analysis in Lab 2 and classify the soil • Assuming the % passing No. 200 Sieve in 55%, and using data from Lab 3 classify the soil • Attach the Plasticity Chart

More Related