CE8491 Important Questions SOIL MECHANICS

CE8491 Important Questions Soil Mechanics Regulation 2017 Anna University free download. Soil Mechanics Important Questions CE8491 pdf free download.

Sample CE8491 Important Questions Soil Mechanics:

Important 2 Mark Questions

1.What are the assumptions of Boussinesq Equtions?
1. The soil mass is an elastic medium for which the modulus of Elasticity, E is constant.
2. The soil mass in homogeneous, that is all its constituent parts or elements are similar CE8491 Important Questions Soil Mechanics
and it has indentical properties at every point in it in indentical directions.
3. The soil mass is isotropic, that is it has identical elastic properties in all directions
through any point of it.
4. The soil mass is semi‐infinite, that is it extends infinitely in all directions below a level
surface. CE8491 Important Questions Soil Mechanics
2. Name the vertical stress distribution diagrams drawn using Boussinesq equation?
1. Vertical stress isobar diagram
2. Vertical pressure distribution on a horizontal plane.
3. Vertical pressure distribution on a vertical line.
3. Define isobar? CE8491 Important Questions Soil Mechanics
An isobar is a curved or contour connecting all points below the ground surface
of equal vertical pressure.
4. Define pressure bulb?
The zone in a loaded soil mass bounded by an isobar of given vertical pressure
intensity is called a pressure bulb.
10. What are the disadvantages of settlement and the components affecting settlement?
If the settlement is excessive, meaning more than what is permissible for the
structure, it may cause structural damage or malfunctioning, especially whent eh rate of
such settlement is rapid. The total settlement St, of a loaded soil can be recognized as
having three components: the immediate settlement Si, the settlement duet o primary
consolidation Sc and the settlement due to secondary consolidation Ss or creep.
St = Si+Sc+Ss CE8491 Important Questions Soil Mechanics
11. Briefly explain about immediate settlement
The immediate settlement or distortion settlement occurs almost immediately after
the load is imposed, as a result of disortion of the soil without any volume change. The
immediate settlement is usually determined by using the elastic theory even though the
deformation itself is not truly elastic.
12. Define consolidation? CE8491 Important Questions Soil Mechanics
According to Terzaghi : “Every process involving a decrease in the water content of a
saturated soil without replacement of the water by air is called a process of consolidation.
13. What are the factors which cause the compressibility of clays?
i. The expulsion of double layer water from between the grains.
ii. Slipping of the particles to new positions of greater density.
iii. Bending of particles as elastic sheet.
14. Define hydrodynamic lag?
The delay caused in consolidation by the slow drainage of water out of a
saturated soil mass is called hydrodynamic lag.
15. Define hydrodynamic pressure? CE8491 Important Questions Soil Mechanics
The pressure that builds up in pore water due to load increment on the soil
is termed excess pore pressure or excess hydrostatic pressure.