WORK PLANS - Laserfiche WebLink

Home Browse Search

Kennedy,/Jenks Consultants C.4.3 Classification of Fine-Grained Soils Fine-grained soils are classified on the basis of: 1. Liquid limit 2. Plasticity Classification uses the following symbols: Basic Symbols Modifying Symbols M - silt L - low liquid limit C-clay H - high liquid limit O -organic Pt- peat The following are basic facts about fine-grained soil classification: • The basic symbol M is used if the soil is mostly silt, while symbol C applies if it consists mostly of clay. Use of symbol O indicates that organic matter is present in an amount sufficient to influence soil properties. The symbol Pt indicates soil that consists mostly of organic material. • Modifying symbols are based on the following hand tests conducted on a soil sample: Dry strength (crushing resistance) Dilatency(reaction to shaking) Toughness (consistency near plastic limit) • Soil designated ML has little or no plasticity and can be recognized by slight dry strength, quick dilatency, and slight toughness. • CL indicates soil with slight to medium plasticity, which can be recognized by medium to high dry strength, very slow dilatency, and medium toughness. • OL is used to describe a soil that is less plastic than CL soil and can be recognized by slight to medium dry strength, medium to slow dilatency, and slight toughness. • MH soil has slight to medium plasticity and can be recognized by low dry strength, slow dilatency, and slight to medium toughness. • Soil designated CH has high plasticity and is recognizable by its high dry strength, no dilatency, and high toughness. • OH soil is less plastic than CH soil and can be recognized by medium to high dry strength, slow dilatency, and slight to medium toughness. • Other descriptive information includes: Page 4 Soil Investigation Work Plan, BNSF Mormon Yard, Stockton, California gYs pWmin4ab11311%502g.OgynshOgrepMsbolHnuasl xoM1 pbnWppc_aogEwehobbgging da