Jaypee Institute of Information Technology (JIIT) 2008 B.E Civil Engineering Test 1 : Foundation Engineering - Question Paper

Jaypee University of Information Technology, Waknaghat Test-1, February 2008 B. Tech, CE 6^,h Semester

Course codc: 07B61 CE 103 Course name: Foundation Engineering Course credits: 4

Max Time: 1 hr

Qla. What are the assumptions behind Terzaghis bearing capacity theory? (2 marks)

Qlb. Sketch the rupture surface for general shear failure below a shallow foundation in accordance with Terzaghis theory. What is the depth of rupture zone? <2)

QI c. Determine the net ultimate bearing capacity of a 2 m wide strip footing placed at a depth of 1.5 m on a dry sand stratum with 7= 19 kN/m³ and (f> = 40. The water table is at a great depth. (2)

Qld. [f the average value ofN below the footing is 40, what must be the settlement in meter per unit pressure for the footing? Assume the footing to be rigid. (2)

Q2a. State the design criterion for shallow foundations. Explain the meaning of cach term. (3)

Q2b. When the ground does not have sufficient shear strength, we sometimes resort to floating raft foundations. Define the term - floating foundation. (3)

Q3. Calculate the ultimate bearing capacity of a rectangular footing in saturated sand,

3m x 4m in plan, placed at a depth of 2m below the ground surface. The load on the footing acts vertically at an eccentricity of 0.5m along the width with respect to the center of the footing.

The water table is close to the ground surface. Also, Ys* ⁼ 19 kN/m and 0 * 40.

(6 marks)