III Year GTE - I Assignment II

DEPARTMENT OF CIVIL ENGINEERING

GEOTECHNICAL ENGINEERING – I

Assignment No. 2

(Last Date: 25-10-2013)

PART -1

Answer any two

1.     Write a note on the following

(a)   Vertical stress on a horizontal plane at a specified depth.

(b)   Pressure Bulb

2.     Explain the method of construction of zero air voids line.

3.     Explain the three drainage tests in Triaxial Test apparatus.

4.     State the assumptions in Terzhaghi’s One dimensional consolidation and explain the theory of consolidation.

PART -2

Solve All Problems

1.     Plot an isobar of intensity 10kN/m² when a point load of intensity 100kN was imposed at ground level. Locate at least 8 points on the pressure bulb.

2.     The following data was obtained in Standard Proctor test for a soil with Gs 2.65

Moisture content                     2          4.2       5.5       6.6       7.5       10       

Wet density (kN/m³)                20.2     20.8     21.7     22        22.1     22                   

Determine OMC and maximum dry density. Also Plot ZAV and 90% saturation line.

3.     The following results were obtained in a Tri-Axial Test.

Cell Pressure                                      Deviator Stress

(kPa)                                                   (kPa)

50                                                        190

150                                                      580

250                                                      750

Determine the shear strength parameters with respect to Total stress.

by

V,.Venkat Ramayya, Faculty of CIVIL