Cohesion of Soil given Angle of Inclination and Slope angle Formula

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Effective Cohesion in Geotech as Kilopascal is the consistency of soft to hard defined on the basis of the standard CSN 73 1001 for different states of consistency and degree of saturation. Check FAQs
Ceff=(Fs-(tan(φπ180)tan(θπ180)))((12)γH(sin((i-θ)π180)sin(iπ180))sin(θπ180))
Ceff - Effective Cohesion in Geotech as Kilopascal?Fs - Factor of Safety in Soil Mechanics?φ - Angle of Internal Friction?θ - Slope Angle?γ - Unit Weight of Soil?H - Height from Toe of Wedge to Top of Wedge?i - Angle of Inclination to Horizontal in Soil?π - Archimedes' constant?

Cohesion of Soil given Angle of Inclination and Slope angle Example

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Here is how the Cohesion of Soil given Angle of Inclination and Slope angle equation looks like with Values.

Here is how the Cohesion of Soil given Angle of Inclination and Slope angle equation looks like with Units.

Here is how the Cohesion of Soil given Angle of Inclination and Slope angle equation looks like.

0.4009Edit=(2.8Edit-(tan(46Edit3.1416180)tan(25Edit3.1416180)))((12)18Edit10Edit(sin((64Edit-25Edit)3.1416180)sin(64Edit3.1416180))sin(25Edit3.1416180))
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Cohesion of Soil given Angle of Inclination and Slope angle Solution

Follow our step by step solution on how to calculate Cohesion of Soil given Angle of Inclination and Slope angle?

FIRST Step Consider the formula
Ceff=(Fs-(tan(φπ180)tan(θπ180)))((12)γH(sin((i-θ)π180)sin(iπ180))sin(θπ180))
Next Step Substitute values of Variables
Ceff=(2.8-(tan(46°π180)tan(25°π180)))((12)18kN/m³10m(sin((64°-25°)π180)sin(64°π180))sin(25°π180))
Next Step Substitute values of Constants
Ceff=(2.8-(tan(46°3.1416180)tan(25°3.1416180)))((12)18kN/m³10m(sin((64°-25°)3.1416180)sin(64°3.1416180))sin(25°3.1416180))
Next Step Convert Units
Ceff=(2.8-(tan(0.8029rad3.1416180)tan(0.4363rad3.1416180)))((12)18000N/m³10m(sin((1.117rad-0.4363rad)3.1416180)sin(1.117rad3.1416180))sin(0.4363rad3.1416180))
Next Step Prepare to Evaluate
Ceff=(2.8-(tan(0.80293.1416180)tan(0.43633.1416180)))((12)1800010(sin((1.117-0.4363)3.1416180)sin(1.1173.1416180))sin(0.43633.1416180))
Next Step Evaluate
Ceff=400.929325949969Pa
Next Step Convert to Output's Unit
Ceff=0.400929325949969kPa
LAST Step Rounding Answer
Ceff=0.4009kPa

Cohesion of Soil given Angle of Inclination and Slope angle Formula Elements

Variables
Constants
Functions
Effective Cohesion in Geotech as Kilopascal
Effective Cohesion in Geotech as Kilopascal is the consistency of soft to hard defined on the basis of the standard CSN 73 1001 for different states of consistency and degree of saturation.
Symbol: Ceff
Measurement: PressureUnit: kPa
Note: Value should be greater than 0.
Factor of Safety in Soil Mechanics
Factor of Safety in Soil Mechanics 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.
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.
Slope Angle
Slope Angle is defined as the angle measured between a horizontal plane at a given point on the land surface.
Symbol: θ
Measurement: AngleUnit: °
Note: Value should be greater than 0.
Unit Weight of Soil
Unit Weight of Soil mass is the ratio of the total weight of soil to the total volume of soil.
Symbol: γ
Measurement: Specific WeightUnit: kN/m³
Note: Value should be greater than 0.
Height from Toe of Wedge to Top of Wedge
Height from Toe of Wedge to Top of Wedge of soil.
Symbol: H
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.
Archimedes' constant
Archimedes' constant is a mathematical constant that represents the ratio of the circumference of a circle to its diameter.
Symbol: π
Value: 3.14159265358979323846264338327950288
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)
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 Slope Stability Analysis using Culman's Method category

​Go Height of Wedge of Soil given Weight of Wedge
h=WweLγ2
​Go Cohesive Force along Slip Plane
Fc=cmL

How to Evaluate Cohesion of Soil given Angle of Inclination and Slope angle?

Cohesion of Soil given Angle of Inclination and Slope angle evaluator uses Effective Cohesion in Geotech as Kilopascal = (Factor of Safety in Soil Mechanics-(tan((Angle of Internal Friction*pi)/180)/tan((Slope Angle*pi)/180)))*((1/2)*Unit Weight of Soil*Height from Toe of Wedge to Top of Wedge*(sin(((Angle of Inclination to Horizontal in Soil-Slope Angle)*pi)/180)/sin((Angle of Inclination to Horizontal in Soil*pi)/180))*sin((Slope Angle*pi)/180)) to evaluate the Effective Cohesion in Geotech as Kilopascal, Cohesion of Soil given Angle of Inclination and Slope angle is defined as the value of cohesion when we have prior information of other parameters used. Effective Cohesion in Geotech as Kilopascal is denoted by Ceff symbol.

How to evaluate Cohesion of Soil given Angle of Inclination and Slope angle using this online evaluator? To use this online evaluator for Cohesion of Soil given Angle of Inclination and Slope angle, enter Factor of Safety in Soil Mechanics (Fs), Angle of Internal Friction (φ), Slope Angle (θ), Unit Weight of Soil (γ), Height from Toe of Wedge to Top of Wedge (H) & Angle of Inclination to Horizontal in Soil (i) and hit the calculate button.

FAQs on Cohesion of Soil given Angle of Inclination and Slope angle

What is the formula to find Cohesion of Soil given Angle of Inclination and Slope angle?
The formula of Cohesion of Soil given Angle of Inclination and Slope angle is expressed as Effective Cohesion in Geotech as Kilopascal = (Factor of Safety in Soil Mechanics-(tan((Angle of Internal Friction*pi)/180)/tan((Slope Angle*pi)/180)))*((1/2)*Unit Weight of Soil*Height from Toe of Wedge to Top of Wedge*(sin(((Angle of Inclination to Horizontal in Soil-Slope Angle)*pi)/180)/sin((Angle of Inclination to Horizontal in Soil*pi)/180))*sin((Slope Angle*pi)/180)). Here is an example- 0.000401 = (2.8-(tan((0.802851455917241*pi)/180)/tan((0.4363323129985*pi)/180)))*((1/2)*18000*10*(sin(((1.11701072127616-0.4363323129985)*pi)/180)/sin((1.11701072127616*pi)/180))*sin((0.4363323129985*pi)/180)).
How to calculate Cohesion of Soil given Angle of Inclination and Slope angle?
With Factor of Safety in Soil Mechanics (Fs), Angle of Internal Friction (φ), Slope Angle (θ), Unit Weight of Soil (γ), Height from Toe of Wedge to Top of Wedge (H) & Angle of Inclination to Horizontal in Soil (i) we can find Cohesion of Soil given Angle of Inclination and Slope angle using the formula - Effective Cohesion in Geotech as Kilopascal = (Factor of Safety in Soil Mechanics-(tan((Angle of Internal Friction*pi)/180)/tan((Slope Angle*pi)/180)))*((1/2)*Unit Weight of Soil*Height from Toe of Wedge to Top of Wedge*(sin(((Angle of Inclination to Horizontal in Soil-Slope Angle)*pi)/180)/sin((Angle of Inclination to Horizontal in Soil*pi)/180))*sin((Slope Angle*pi)/180)). This formula also uses Archimedes' constant and , Sine, Tangent function(s).
Can the Cohesion of Soil given Angle of Inclination and Slope angle be negative?
No, the Cohesion of Soil given Angle of Inclination and Slope angle, measured in Pressure cannot be negative.
Which unit is used to measure Cohesion of Soil given Angle of Inclination and Slope angle?
Cohesion of Soil given Angle of Inclination and Slope angle is usually measured using the Kilopascal[kPa] for Pressure. Pascal[kPa], Bar[kPa], Pound Per Square Inch[kPa] are the few other units in which Cohesion of Soil given Angle of Inclination and Slope angle can be measured.
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