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What type of soil allows you to bench the side of an excavation at a maximum 1 1?

What type of soil allows you to bench the side of an excavation at a maximum 1 1?

Type B Soil 1
B-1.2 Excavations Made in Type B Soil 1. All simple slope excavations 20 feet or less in depth shall have a maximum allowable slope of 1:1.

What is type c60 soil?

3.3 Type C-60 soil is a moist, cohesive soil or a moist dense granular soil, which does not fit into Type A or Type B classifications, and is not flowing or submerged. This material can be cut with near vertical sidewalls and will stand unsupported long enough to allow the shores to be properly installed.

Which type of soil is the least stable to trench in?

Type C
Type A soil is the most stable soil in which to excavate. Type C is the least stable soil. It’s important to remember that a trench can be cut through more than one type of soil.

What is type AB and C soil?

Type B Soils are cohesive soils with an unconfined compressive strength greater than 0.5 tsf (48 kPa) but less than 1.5 tsf (144 kPa). Other Type C soils include granular soils such as gravel, sand and loamy sand, submerged soil, soil from which water is freely seeping, and submerged rock that is not stable.

What angle should a trench be cut back to?

The trench shield must extend at least 18 inches above the top of the vertical side. For combination slope/bench systems in TYPE C soil and a trench depth of less than 20 feet, the steepest maximum allowable slope is 34 degrees from the horizontal is allowed only if a trench support or shield is used.

What are the 13 types of soil?

Soil Types

  • Sandy soil. Sandy Soil is light, warm, dry and tend to be acidic and low in nutrients.
  • Clay Soil. Clay Soil is a heavy soil type that benefits from high nutrients.
  • Silt Soil. Silt Soil is a light and moisture retentive soil type with a high fertility rating.
  • Peat Soil.
  • Chalk Soil.
  • Loam Soil.

What is the most stable type of soil?

OSHA classifies soils into four categories: Solid Rock, Type A, Type B, and Type C. Solid Rock is the most stable, and Type C soil is the least stable. Soils are typed not only by how cohesive they are, but also by the conditions in which they are found.

What are the 4 types of soil?

At what depth do you need trench support?

5 feet
Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock. If less than 5 feet deep, a competent person may determine that a protective system is not required.

When digging a trench a gas line hit can lead to an explosion?

– A gas line hit can lead to an explosion. – A broken water line can fill a trench in seconds. – Contact with buried power cables can kill. Safety Tip: Always your local utility locating service such as 811 before you dig, and get the utilities marked.

What are the 5 types of soil?

The 5 Different Types Of Soil

  • Sandy Soil. Sandy soil is light, warm, and dry with a low nutrient count.
  • Clay Soil. Clay weighs more than sand, making it a heavy soil that benefits from high nutrients.
  • Peat Soil. Peat soil is very rarely found in natural gardens.
  • Silt Soil.
  • Loamy Soil.

What are the 10 types of soil?

  • 10: Chalk. Chalk, or calcareous soil, is found over limestone beds and chalk deposits that are located deep underground.
  • 9: Sand. ” ”
  • 8: Mulch. While mulch isn’t a type of soil in itself, it’s often added to the top layer of soil to help improve growing conditions.
  • 7: Silt.
  • 6: Topsoil.
  • 5: Hydroponics.
  • 4: Gravel.
  • 3: Compost.

Which is the best type of soil for digging a trench?

Generally speaking, the more clay that is in the soil being excavated, the better the trench walls will hold up. Another factor in soil cohesiveness is water. Soil that is filled with water is termed saturated. Saturated soil does not hold together well, and is particularly dangerous in excavation work.

What kind of soil is used for excavations?

Granular soil is gravel, sand, or silt (coarse-grained soil), with little or no clay content. Cohesive soil has high clay content and is very durable and strong. It doesn’t break up or decay and can be excavated using vertical side slopes. Fissured soil is soil that tends to break up.

What kind of soil can be penetrated by the thumb?

Type A soils with an unconfined compressive strength of 1.5 tons per square foot can be readily indented by the thumb; however, they can be penetrated by the thumb only with very great effort.

What should be considered when designing an excavation system?

Excavations must be immediately filled back to their normal state after completing the work. When designing an effective excavation protective system, consider soil classification, depth of cut, water content of soil, changes due to weather and climate, and other operations in the vicinity.