What is strain factor E50?
Strain Factor (E50) – strain corresponding to 1/2 the maximum principal stress difference (typical values are provided in the table below) Undrained Shear Strength.
What is ε50?
ε50 is one of the parameters in the design of deep foundations under axial and lateral loading that some analysis procedures such as p-y and t-z methods make use of this parameter. However, available literature provide limited recommendations for ε50 values in c-ϕ materials.
When the effective stress of the soil is equal to zero the soil is said to be in?
The condition of zero effective stress associated with upward seepage is also called liquefaction, quicksand, or a boiling condition. Quicksand was so named because the soil particles move around and appear to be ‘alive’ (the biblical meaning of ‘quick’ – as opposed to ‘dead’).
What is a py curve?
P-Y curves are the numerical models used to simulate the response of soil resistance (p, soil resistance per unit length of the pile) to the pile deflection (y) for the piles under lateral loading.
What is soil stiffness?
In general, soil stiffness is determined by soil shear strength. The higher the soil stiffness is, the more fatigue damage may occur in the riser pipe, since vibration frequency and stress ranges will be higher. Secant soil stiffness is generally higher than tangent soil stiffness.
What is soft clay soil?
Description. Soft clay is defined as soils with large fractions of fine particles such as silty and clayey soils, which have high moisture content, peat foundations and loose sand deposits, located near or under the water table (Kamon and Bergado, 1991).
When porosity is 50 percentage the void ratio is?
Porosity is defined as the ratio of the volume of voids to the total volume of the soil. So porosity is always less than the void ratio. Here the void ratio is 0.5, so the porosity should be less than 50% i.e. 33%.
What is the effect of water for determining effective stress?
But if we put this soil mass in water then because of buoyancy force the net total downward force is reduced consequently the stress on particles is reduced. This reduced stress is called effective stress. The stress exerted by the water present in the soil pores is called the pore water pressure.
How do you calculate lateral pile capacity?
In general, at a pile-head deflection of 10 mm, the applied load, , is defined as the design value of lateral bearing capacity of single piles. As a result, the m value used to determine the lateral bearing capacity of single piles can be obtained from the m-Y0 curve.
What is soil modulus?
in Parameters. Soil Young’s modulus (E), commonly reffred to as soil elastic modulus, is an elastic soil parameter and a measure of soil stiffness. It is defined as the ratio of the stress along an axis over the strain along that axis in the range of elastic soil behaviour.
When porosity is 50 void ratio is Mcq?
Porosity MCQ – Geotechnical Engineering
How do you measure effective stress in soil?
The total stress is the sum of the weight of the soil up to the surface and the weight of water above this: Vertical total stress at depth z, sv = g . z + gw .
When the water level in a lake or tank rises the effective stresses in the soil below are?
Changes in water level below ground result in changes in effective stresses below the water table. A rise increases the pore water pressure at all elevations thus causing a decrease in effective stress.
What is the point of fixity?
One current design practice uses a point of fixity, which assumes the pile- soil system can be modeled as a cantilever of a particular length, forming a single column in a multi-column elastic frame.
What is meant by depth of fixity?
The depth below ground level at which the soil firmly holds a pile.
How do you calculate modulus of soil?
Most recent answer
- There are some correlations between cohesion and elastic modulus of soil, for cohesion soils and intermediate soils in stance: C=-2.2049+6.48N (r2=0.98), (N is SPT number) and C(kPa).
- After this you can use another correlation between ‘E’ and N SPT to find elasticity modulus.
What is the subgrade modulus of soil?
The Subgrade Modulus, also known as the Modulus of Subgrade Reaction, is a stiffness parameter typically used in defining the support conditions of footings and mat foundations, such as that shown on Figure 1. The parameter is expressed in units of [Force]/[Length]3.