Minimum depth of well foundation
12Apr, 2023
Negative skin friction and its minimization
The downward drag force acting on a pile due to downward movement of surrounding soil.
Causes
- Newly filled material without compaction.
- If fill material is loose cohesion-less soil.
- When fill material is deposited over soft soil.
- Lowering of GWT
Minimization
12Apr, 2023
Floating Foundation
Types of mat foundation in which the weight of excavation is equal to sum of raft weight and load from superstructure.
12Apr, 2023
In plate load test, the bearing capacity of clay soil is equal to bearing capacity of plate but not in sandy soil why?
The bearing capacity of sandy soil depends upon the width of foundation. The width of plate is 5 times less than width of pit. That’s why……..
12Apr, 2023
Why Rankine and Coulombs Earth Pressure Theories cannot be used for computation of lateral earth pressure in Sheet Pile?
Rankine and Coulombs theory are applicable only for rigid retaining walls rotating about base.
Sheeting and Bracing system are flexible (not rigid) and rotation takes place at the top of the wall.
12Apr, 2023
How to you calculate earth pressure when the lateral movement of soil is prevented by unyielding the wall?
Unyielding Means Wall is at rest. So, calculate Earth pressure at rest. (Yeilding is restrained = Earth pressure at rest)
12Apr, 2023
Information required during preservation of soil sample in laboratory
- Name of project
- Name of Boring
- Name of Sampling
- Date of Sampling etc.
12Apr, 2023
Method of Drilling for boring in boulder and rocky areas
Percussion Drilling (For boring in Rocky area such as construction of bridge over river)