In Which Case The Wall Moves Towards The Backfill Mcq?

When the retaining wall is moving away from the backfill the the ratio between lateral earth pressure and vertical earth pressure is called coefficient of active earth pressure.

When the retaining wall moves towards the earth What is the pressure exerted by a wall known as?

Earth pressure:

This pressure exerted by retaining material is termed as Earth pressure. Retaining material retained by retaining wall or structure is termed as backfill which may have its top surface horizontal or inclined.

Which of the following cases for cohesionless backfill in Rankine theory is considered?

Which of the following cases for cohesion less backfill in Rankine’s theory is considered? iii) Backfill with a sloping surface and inclined back and surcharge. Explanation: The retaining walls are constructed of masonry or concrete, due to this the frictional force develops.

When a retaining wall moves towards the backfill the pressure exerted on the wall is termed as?

passive pressure:

In passive state the wall is pushed towards the back fill. The passive earth pressure is greater than earth pressure at rest because shearing resistance is built up between two surface of soil mass.

What is the assumption made about back of wall in the Rankine theory of earth pressure?

The Rankine’s theory assumes that there is no wall friction , the ground and failure surfaces are straight planes, and that the resultant force acts parallel to the backfill slope. In case of retaining structures, the earth retained may be filled up earth or natural soil.

When the retaining wall moves into the soil the lateral earth pressure is called as?

(ii) Soil exerts a push against the retaining wall by virtue of its tendency to slip laterally and seek its natural slope or angle of repose. Thus making the wall to move slightly away from the backfilled soil mass. This kind of pressure is known as “active earth pressure”.

What is active earth pressure?

The minimum value of lateral earth pressure exerted by soil on a structure, occurring when the soil is allowed to yield sufficiently to cause its internal shearing resistance along a potential failure surface to be completely mobilized.

Which statement is correct for earth pressure at rest?

Explanation: For earth pressure at rest, there is horizontal stress as well as the vertical stress. For earth pressure at rest, there will be no shear stresses. μ= Poisson’s ratio. Explanation: The earth pressure at rest has the condition corresponding to ∈h=0.

What is active thrust?

The active thrust, ? ? , is determined from the conditions of force equilibrium and its point of application is determined from the conditions of moment equilibrium. Figure 1 shows an inclined retaining wall, with inclined cohesionless backfill subjected to a uniform surcharge intensity of q KN/m2.

What is KA and KP in soil mechanics?

Ka = Active Earth Pressure 3. Kp = Passive Earth Pressure (Passive is more like a resistance) Earth Pressure At Rest At rest earth pressure occur when there is no wall rotation such as in a braced wall. (

What is the coefficient of active earth pressure in retaining wall?

Active earth pressure coefficient (Ka): It is the ratio of horizontal and vertical principal effective stresses when a retaining wall moves away (by a small amount) from the retained soil. K a = 1 − sin ⁡ ( ϕ ) 1 + sin ⁡ ( ϕ ) = tan 2 ( 45 − ϕ 2 ) .

What is retaining wall in building?

A retaining wall is a structure that holds or retains soil behind it. There are many types of materials that can be used to create retaining walls like concrete blocks, poured concrete, treated timbers, rocks or boulders. Some are easy to use, others have a shorter life span, but all can retain soil.

What is soil profile Mcq?

Explanation: A cross-sectional view of the horizon in a soil is called a soil profile. This soil profile can able to identify the special characteristics present in the soils and this can be used as a referral while studying a soil pollution causing by different soils.

Which method can be adopted in case of rock tunneling?

Explanation: Blasting is the conventional method which is adopted in case of rock tunneling.

Is the minimum earth pressure?

The minimum stable value of K is called the active earth pressure coefficient, Ka; the active earth pressure is obtained, for example, when a retaining wall moves away from the soil. … For a level ground deposit with zero lateral strain in the soil, the “at-rest” coefficient of lateral earth pressure, K0 is obtained.

What is soil bearing capacity?

In a nutshell, bearing capacity is the capacity of soil to support the loads that are applied to the ground above. It depends primarily on the type of soil, its shear strength and its density. It also depends on the depth of embedment of the load – the deeper it is founded, the greater the bearing capacity.

When was active earth pressure created?

Article shared by : ADVERTISEMENTS: Rankine (1857) considered the equilibrium of a soil element at any depth (h) in the backfill behind a retaining wall and determined the active earth pressure.

What is a lateral pressure?

Lateral Pressure refers to any tendency (or propensity) of individuals and societies to expand their activities and exert influence and control beyond their established boundaries, whether for economic, political, military, scientific, religious, or other purposes.

Which state of pressure is considered for the design of bridge abutments and basement walls?

At-rest soil pressure is developed during the construction of bridge abutment.

What are the two theories used to compute lateral earth pressure?

There are two commonly uses lateral earth pressure theories: Coulomb (1776) and Rankine (1857).

What are the assumptions of Rankine theory?

It assumes that the soil is cohesionless, the wall is frictionless, the soil-wall interface is vertical, the failure surface on which the soil moves is planar, and the resultant force is angled parallel to the backfill surface.

Which of the following assumptions of Rankine earth pressure theory is correct?

Which of the following assumptions of the Rankine’s theory of lateral earth pressure are correct? … The soil mass is semi-infinite, homogenous, dry and cohesion-less. 2.

Which assumption is true for the Coulomb’s wedge theory?

The assumptions made by Coulomb while giving his theory was:

The soil is isotropic and homogeneous. The surface of rupture is a plane. The failure wedge is a rigid body. There is friction between and the wall.