Factor of Safety for Cohesive Soil given Depth of Prism Formula

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Factor of Safety expresses how much stronger a system is than it needs to be for an intended load. Check FAQs
fs=(Csγ'zcos((i))sin((i)))+(tan((φ))tan((i)))
fs - Factor of Safety?Cs - Cohesion of Soil?γ' - Submerged Unit Weight?z - Depth of Prism?i - Angle of Inclination to Horizontal in Soil?φ - Angle of Internal Friction?

Factor of Safety for Cohesive Soil given Depth of Prism Example

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Here is how the Factor of Safety for Cohesive Soil given Depth of Prism equation looks like with Values.

Here is how the Factor of Safety for Cohesive Soil given Depth of Prism equation looks like with Units.

Here is how the Factor of Safety for Cohesive Soil given Depth of Prism equation looks like.

1.3494Edit=(5Edit5.01Edit3Editcos((64Edit))sin((64Edit)))+(tan((46Edit))tan((64Edit)))
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Factor of Safety for Cohesive Soil given Depth of Prism Solution

Follow our step by step solution on how to calculate Factor of Safety for Cohesive Soil given Depth of Prism?

FIRST Step Consider the formula
fs=(Csγ'zcos((i))sin((i)))+(tan((φ))tan((i)))
Next Step Substitute values of Variables
fs=(5kPa5.01N/m³3mcos((64°))sin((64°)))+(tan((46°))tan((64°)))
Next Step Convert Units
fs=(5kPa5.01N/m³3mcos((1.117rad))sin((1.117rad)))+(tan((0.8029rad))tan((1.117rad)))
Next Step Prepare to Evaluate
fs=(55.013cos((1.117))sin((1.117)))+(tan((0.8029))tan((1.117)))
Next Step Evaluate
fs=1.34938537687227
LAST Step Rounding Answer
fs=1.3494

Factor of Safety for Cohesive Soil given Depth of Prism Formula Elements

Variables
Functions
Factor of Safety
Factor of Safety expresses how much stronger a system is than it needs to be for an intended load.
Symbol: fs
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Cohesion of Soil
Cohesion of Soil is the ability of like particles within soil to hold onto each other. It is the shear strength or force that binds together like particles in the structure of a soil.
Symbol: Cs
Measurement: PressureUnit: kPa
Note: Value should be greater than 0.
Submerged Unit Weight
Submerged Unit Weight is the unit weight of weight of soil as observed underwater in a saturated condition of course.
Symbol: γ'
Measurement: Specific WeightUnit: N/m³
Note: Value should be greater than 0.
Depth of Prism
Depth of Prism is the length of prism along z direction.
Symbol: z
Measurement: LengthUnit: m
Note: Value should be greater than 0.
Angle of Inclination to Horizontal in Soil
Angle of Inclination to Horizontal in Soil is defined as the angle measured from the horizontal surface of the wall or any object.
Symbol: i
Measurement: AngleUnit: °
Note: Value should be greater than 0.
Angle of Internal Friction
Angle of Internal Friction is the angle measured between the normal force and resultant force .
Symbol: φ
Measurement: AngleUnit: °
Note: Value should be greater than 0.
sin
Sine is a trigonometric function that describes the ratio of the length of the opposite side of a right triangle to the length of the hypotenuse.
Syntax: sin(Angle)
cos
Cosine of an angle is the ratio of the side adjacent to the angle to the hypotenuse of the triangle.
Syntax: cos(Angle)
tan
The tangent of an angle is a trigonometric ratio of the length of the side opposite an angle to the length of the side adjacent to an angle in a right triangle.
Syntax: tan(Angle)

Other formulas in Stability Analysis of Submerged Slopes category

​Go Normal Stress Component given Submerged Unit Weight
σNormal=γ'z(cos((i)))2
​Go Submerged Unit Weight given Normal Stress Component
γ'=σNormalz(cos((i)))2
​Go Depth of Prism given Submerged Unit Weight
z=σNormalγ'(cos((i)))2
​Go Shear Stress Component given Submerged Unit Weight
𝜏=(γ'zcos((i))sin((i)))

How to Evaluate Factor of Safety for Cohesive Soil given Depth of Prism?

Factor of Safety for Cohesive Soil given Depth of Prism evaluator uses Factor of Safety = (Cohesion of Soil/(Submerged Unit Weight*Depth of Prism*cos((Angle of Inclination to Horizontal in Soil))*sin((Angle of Inclination to Horizontal in Soil))))+(tan((Angle of Internal Friction))/tan((Angle of Inclination to Horizontal in Soil))) to evaluate the Factor of Safety, The Factor of Safety for Cohesive Soil given Depth of Prism is defined as the ratio of soil's shear strength to applied stress. Critical for stability in construction. Factor of Safety is denoted by fs symbol.

How to evaluate Factor of Safety for Cohesive Soil given Depth of Prism using this online evaluator? To use this online evaluator for Factor of Safety for Cohesive Soil given Depth of Prism, enter Cohesion of Soil (Cs), Submerged Unit Weight '), Depth of Prism (z), Angle of Inclination to Horizontal in Soil (i) & Angle of Internal Friction (φ) and hit the calculate button.

FAQs on Factor of Safety for Cohesive Soil given Depth of Prism

What is the formula to find Factor of Safety for Cohesive Soil given Depth of Prism?
The formula of Factor of Safety for Cohesive Soil given Depth of Prism is expressed as Factor of Safety = (Cohesion of Soil/(Submerged Unit Weight*Depth of Prism*cos((Angle of Inclination to Horizontal in Soil))*sin((Angle of Inclination to Horizontal in Soil))))+(tan((Angle of Internal Friction))/tan((Angle of Inclination to Horizontal in Soil))). Here is an example- 1.351074 = (5000/(5.01*3*cos((1.11701072127616))*sin((1.11701072127616))))+(tan((0.802851455917241))/tan((1.11701072127616))).
How to calculate Factor of Safety for Cohesive Soil given Depth of Prism?
With Cohesion of Soil (Cs), Submerged Unit Weight '), Depth of Prism (z), Angle of Inclination to Horizontal in Soil (i) & Angle of Internal Friction (φ) we can find Factor of Safety for Cohesive Soil given Depth of Prism using the formula - Factor of Safety = (Cohesion of Soil/(Submerged Unit Weight*Depth of Prism*cos((Angle of Inclination to Horizontal in Soil))*sin((Angle of Inclination to Horizontal in Soil))))+(tan((Angle of Internal Friction))/tan((Angle of Inclination to Horizontal in Soil))). This formula also uses Sine (sin)Cosine (cos), Tangent (tan) function(s).
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