site investigation problems to practice
DESCRIPTION
Some problems to practiceTRANSCRIPT
Foundation Engineering Class Test 1 Feb 2016
(Set A) Answer all the questions.
1) What is a Shallow Foundation? Where are they used? (1+1)
2) You, a Civil Engineer, is given two option to choose for soil testing. Initial investigation showed
the presence of Stiff clay.
Option 1) A Shelby tube whose External Diameter is 51 mm and Internal Diameter is 48 mm.
Option 2) A sampling tube of External Diameter of 75 mm and Internal Diameter of 69 mm.
Which one would you choose and why?
(Hint: Find the Area ratio of each of them). (2+2+2)
3) Explain Standard Penetration Test with neat sketch. (5+2)
4) SPT test was carried out at the depth of 4m in the field. The field report indicated blow count
for
1st 15 cm to be 7
2nd 15 cm to be 12
3rd 15 cm to be 16
The soil has the unit weight of 14 kN/m^3.
a) Determine the SPT Value (or N value). (2)
b) Make necessary correction and state the corrected N value. (5)
5) During the Site investigation, it is necessary to establish the Water table. Water in borehole
was bailed out to a depth of 11.00m (below the ground). The rise of water was recorded at 24
hour interval as follows:
h1= 62.1 cm, h2= 58.0 cm, h3=55.5 cm.
Establish the location of the groundwater table to be kept in Site investigation Report.
(8)
Bonus Question Derive Kp = 𝟏+𝑺𝒊𝒏 𝝓
𝟏−𝑺𝒊𝒏 𝝓 (6)
𝜎′𝑧 𝜎1(rest) 𝜎
𝜏
At Rest Condition
Failure Plane
Failure Plane
𝜎1(Rest)
𝜙
O
A
B
Foundation Engineering Class Test 1 Feb 2016
(Set B) Answer all the questions.
1) What is a Deep Foundation? Where are they used? (1+1)
2) Your consulting office needs to buy a Sampling tube for a project to be carried out in soft soil.
Option 1) A Sampling tube whose External Diameter is 50 mm and Internal Diameter is 49
mm.
Option 2) A sampling tube of External Diameter of 74 mm and Internal Diameter of 68 mm.
Which one would you buy and why?
(Hint: Find the Area ratio of each of them). (2+2+2)
3) SPT test was carried out at the depth of 4m in the field. The field report indicated blow count
for
1st 15 cm to be 6, 2nd 15 cm to be 12, 3rd 15 cm to be 16. The soil has the unit weight of 16
kN/m^3.
a) Determine the SPT Value (or N value). (2)
b) Make necessary correction and state the corrected N value. (5)
4) Explain Standard Penetration Test with neat sketch. (5+2)
5) During the Site investigation, it is necessary to establish the Water table. Water in borehole
was bailed out to a depth of 12.04m (below the ground). The rise of water was recorded at 24
hour interval as follows:
h1= 61.2 cm, h2= 58.8 cm, h3=56.1 cm.
Establish the location of the groundwater table to be kept in Site investigation Report.
(8)
Bonus Question Derive Ka = 𝟏−𝑺𝒊𝒏 𝝓
𝟏+𝑺𝒊𝒏 𝝓 (6)
𝜎′𝑧 𝜎1(rest) 𝜎
𝜏
At Rest Condition
Failure Plane
Failure Plane
𝜎1(Rest)
𝜙
O
A
B
Foundation Engineering Class Test 1 Feb 2016
(Set C) Answer all the questions.
1) What is a foundation? What is the purpose of foundation? (1+1)
2) You are hired as a Consulting Engineer. You are asked to give the recommendation to buy a
sampling tube to be used in Soft Clay.
Option 1) A Sampling tube whose External Diameter is 50 mm and Internal Diameter is 49
mm.
Option 2) A sampling tube of External Diameter of 74 mm and Internal Diameter of 68 mm.
Which one would you recommend and why?
(Hint: Find the Area ratio of each of them). (2+2+2)
3) SPT test was carried out at the depth of 4m in the field. The field report indicated blow count
for
1st 15 cm to be 8, 2nd 15 cm to be 11, 3rd 18 cm to be 20. The soil has the unit weight of 20
kN/m^3.
a) Determine the SPT Value (or N value). (2)
b) Make necessary correction and state the corrected N value. (5)
4) Explain Standard Penetration Test with neat sketch. (5+2)
5) During the Site investigation, it is necessary to establish the Water table. Water in borehole
was bailed out to a depth of 10.00m (below the ground). The rise of water was recorded at 24
hour interval as follows:
h1= 63.2 cm, h2= 59.9 cm, h3=57.3 cm.
Establish the location of the groundwater table to be kept in Site investigation Report (8)
Bonus Question Derive Ka = 𝟏−𝑺𝒊𝒏 𝝓
𝟏+𝑺𝒊𝒏 𝝓 (6)
𝜎′𝑧 𝜎1(rest) 𝜎
𝜏
At Rest Condition
Failure Plane
Failure Plane
𝜎1(Rest)
𝜙
O
A
B