What are the main factors affecting shear strength results

Reference no: EM132355135

Assignment - Answer all questions:

Q1) A rectangular storage tank 5m wide by 10m long in plan area is to be founded at a depth of 2m below the surface of a thick deposit of saturated clay having a density of 1.80Mg/m³ and an average undrained shear strength of 32kN/m².

Given that the total weight of the tank when full will be 5000kN, calculate the:

(a) Net ultimate bearing pressure

(b) Factor of safety against undrained failure of the foundation.

Q2) A load-bearing wall is to be founded on a concrete strip footing 1m wide and located at a depth of 0.5m below ground level in a deep deposit of saturated clay. It is estimated that the wall load at ground level will be 125kN per metre run of the wall.

Neglecting the difference in density between the clay and the footing, and taking the undrained shear strength of the clay to be70kN/m², calculate:

(a) Net ultimate bearing pressure

(b) Factor of safety against undrained failure of the foundation.

Q3) A square footing is to be constructed to support a vertical column carrying a load at ground level of 540kN. The footing will be founded at a depth of 1m in a 6m thick deposit of stiff saturated boulder clay that overlies Triassic sandstone.

Neglecting the difference in density between concrete and clay, calculate the size of footing required to provide a factor of safety of 3 against failure immediately after construction.

Q4) When carrying out shear box test, several factors play an important role on the shear strength results of that particular soil tested;

What are the main factors affecting shear strength results?

Compare between shear strength of saturated cohesionless soils and that for saturated cohesive soils if performed on the same shear box machine.

Make a thorough comparison between laboratory tests and field tests used in measuring shear strength of soils.

Reference no: EM132355135

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