Question

3. Is there a relationship between allowable bearing capacity and allowable settlement? Discuss in detail by giving the definition of each them with an explanation of their use. b. How do you apply Newmark solution of Boussinesq method to the stress increment at point A at a depth of 5m. A 2m5m 2m 10m c. How does the presence of water table at a level at or above the base of footing affects the footing? How do are the bearing capacity and bearing pressures influenced? What are the advantages and disadvantages?! d. What are the in-situ test methods that give a direct indication of stress - strain response of soil?

Answer 1

a) yes there is a relation between allowable bearing capacity and allowable settlement. allowable bearing capacity: It is the minimum bearing capacity that can be applied on the soil rich that the following requirem are satisfied a) adequate factor of safety with respect to shear failure b) settlement within the permissible limit are satisfied It is always governed by the settlement criteria allowable settlement: It is the acceptable amount of settlement of the structure and it usually includes factor of safety. 90C 3m 2m 5m 2m Com em -

Comѕidе стол, n=B, ML finding z is the depth at which we are increase in stress rectangle CIDA -Length of the of ou CIDA B- Breadth m = 3 ma from the Fadum chart, In - Do change in stress P. let initial stress be P. from chart In from chart is 0.15 40 p = 0.15P. consider De DAEF. - 2 , m-8 - a, w 2/3 = 0.6. I = 0.08P. у в 9 consider 0:4 - 1.6 - 0.4 I from chart = 0.13. I consider AGFIT 10 013P n.o 4, m-0.4 I=0.06P total increase in sluss a 0.158 + 0.138 +0.088 +0.067 Ap.2 0.42P.

c) when the water table is at de above the base of the footing, the soil is submerged and its ability to support the road acting over its unit area is reduced, the submerged weight is used for the soil below the water table for computing surcharge d) :) Pressure meter test – by pumping a borehole to we determine the a certain depth stress - strain relation. ;) Using a flat jack Principle of the two flat jacks on apply a stress on test - Based on the use of a common oil supply to the soil.