Bissoy.com
Doctors Medicines MCQs Q&A

While designing a pile, negative skin friction is considered when the pile is constructed in:

While designing a pile, negative skin friction is considered when the pile is constructed in: Correct Answer Fill material

Concept:

‘Negative skin friction’ or ‘downward drag’ is a phenomenon that occurs when a soil layer surrounding a portion of the pile settles more than the pile. Such relative motion may occur when the clay stratum undergoes consolidation due to

1. A fill was recently placed over the clay stratum.

2. Lowering of the groundwater table.

3. Reconsolidation occurring due to disturbance caused by pile driving in sensitive clay stratum, etc.

Negative skin friction increases gradually as the consolidation of the clay layer proceeds since the effective overburden pressure gradually increases due to the dissipation of excess pore pressure. 

[ alt="zza45" src="//storage.googleapis.com/tb-img/production/17/02/zza45.JPG" style="height: 334px; width: 450px;">

Related Questions

Study the statements listed below (1) Negative skin friction is developed when the pile is driven through a recently deposited clay layer (2) Negative skin friction is developed when the pile is driven through a layer of dense sand (3) Negative skin friction is developed due to sudden drawdown of the water table Out of these statements
Which of the following is NOT true about Frictional force? A. Friction is the force which opposes the relative motion of two surfaces in contact. B. The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction. C. Friction in machines wastes energy and also causes wear and tear. D. Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction.
While discussing about friction, a teacher gave a number of examples to explain the concept. Some of the examples where friction is useful in our day-to-day life as quoted by the teacher are given below : A. We are able to write because of friction between the tip of the pen and the paper. B. We are able to walk because of friction between our feet and the ground. C. A ball thrown vertically upwards comes back to us due to friction. D. We are able to stop a moving vehicle by applying brakes because of friction. The correct examples were
Negative skin friction in the soil is considered when the pile is constructed through a:
The following statements pertain to the occurrence of negative skin friction in piles. S1: It is developed when the pile is driven through a recently deposited clay layer. S2: It is developed when the pile is driven through a layer of dense sand S3: It is developed due to a sudden drawdown of the water table. Which of the above statement(s) is/are incorrect?
From the three typical cases C1, C2, C3 choose the combination, where one can expect occurrence of negative skin friction, on piles: C1 : An upward drag exists in the pile C2 : Develop if the filled material around pile is a loose sand deposit. C3 : Lowering of ground water table resulting in consolidation of soil
Consider the following statements: 1. The kinetic friction is always less than the rolling friction. 2. The kinetic friction is always equal to the rolling friction. 3. The kinetic friction is always greater than the rolling friction. Which of the following statement is correct?
In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives. While language as the medium ___________ thought may be compared to air as the medium of the sun's influence, in other _____________ it is like the skin of the body; a scurvy skin shows bad blood within, and a scurvy language shows inaccurate thought ___________ a confused mind. And as a disease once fixed on the skin reacts and poisons the blood in turn as it has first been poisoned by the blood, so careless use of language __________ indulged reacts on the mind to make it permanently and increasingly _____________, illogical, and inaccurate in its thinking. in other _____________ it is like the skin
A tattoo is a permanent mark or design made on your skin with pigments inserted through pricks into the skin's top layer. Typically, the tattoo artist uses a hand-held machine that acts much like a sewing machine, with one or more needles piercing the skin repeatedly. With every puncture, the needles insert tiny ink droplets. Tattoos carry the risk of creating skin diseases, allergic reactions, and further MRI complications.Since tattoo instruments come in contact with blood and bodily fluids, diseases may be transmitted if the instruments are used on more than one person without being sterilised. However, infection from tattooing in clean and modern tattoo studios employing single-use needles is rare. Assuming the information in the above paragraph is true, which of the following is true?
Which of the following is correct about friction? I. Rolling friction is smaller than the sliding friction II. Sliding friction is smaller than static friction