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As per IRC the slope of earth in cutting is
1
2
4
3
1
According to the Indian Roads Congress (IRC) standards, the side slope for earthwork in cutting is generally recommended to be 1:1 for most soil types to ensure slope stability. This ratio represents the horizontal to vertical proportion of the cut slope face.
According to the Indian Roads Congress (IRC) standards, the side slope for earthwork in cutting is generally recommended to be 1:1 for most soil types to ensure slope stability. This ratio represents the horizontal to vertical proportion of the cut slope face.
Slope=VerticalHorizontalтАЛ тАФ Ratio representing the inclination of the cutting face.
The stability of a cut slope depends on the angle of repose of the soil and internal cohesion. A slope of 1:1 (45┬░) is considered the standard baseline for engineering design in stable soils. Steeper or flatter slopes are adjusted based on specific geotechnical investigations such as the internal friction angle (╧Х) and soil cohesion (c).
Standard slope in cutting for road embankments is 1:1.
IRC recommendations ensure structural integrity and prevent landslides in cuts.
Slope requirements vary depending on soil type (e.g., loose sand requires flatter slopes).
Cutting side slopes are steeper than embankment slopes due to undisturbed soil strength.
Minimizes excavation volume
Ensures safety against slope failure in typical soil
May require shoring or reinforcement in very weak soils
Does not account for high water table effects
Highway geometry design
Railway cutting profiles
General earthwork construction
For embankment filling, the ratio is typically 2:1 (Horizontal:Vertical).
In very hard rock, the slope can be significantly steeper, often approaching vertical (e.g., 1:0.25).
A is correct тАФ The IRC standard for the side slope of earthwork in cutting is 1:1.
Remember: In highway engineering, 'Cutting' is usually 1:1 (steeper), while 'Embankment' (filling) is 2:1 (flatter) for better stability of the loose fill.
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