Which of the following is not one of the characteristics of a local sh...
In local shear stress there is no tilting of footing and therefore the failure is not sudden.
Which of the following is not one of the characteristics of a local sh...
Introduction:
Local shear failure is a type of failure that occurs within a small portion of a soil mass, typically near the foundation or footing. It is important to understand the characteristics of local shear failure to assess the stability and bearing capacity of the soil.
Explanation:
The given options are:
a) Failure is defined by large settlements
b) Failure surface do not reach the ground surface
c) Failure is sudden
d) Ultimate bearing capacity is not well defined
a) Failure is defined by large settlements:
- Local shear failure is typically associated with large settlements.
- When the shear strength of the soil is exceeded, the soil mass undergoes significant deformation, resulting in large settlements.
- Therefore, this characteristic is consistent with local shear failure.
b) Failure surface do not reach the ground surface:
- Local shear failure occurs within a small portion of the soil mass, typically near the foundation or footing.
- The failure surface does not extend all the way to the ground surface.
- This characteristic prevents widespread failure and limits the extent of damage.
- Therefore, this characteristic is consistent with local shear failure.
c) Failure is sudden:
- This characteristic is not consistent with local shear failure.
- Local shear failure typically occurs gradually over time as the applied load exceeds the shear strength of the soil.
- It is not a sudden or instantaneous failure.
- Therefore, option C is the correct answer.
d) Ultimate bearing capacity is not well defined:
- Local shear failure affects the bearing capacity of the soil.
- The ultimate bearing capacity, which is the maximum load that can be supported by the soil without causing failure, is not well defined in the presence of local shear failure.
- The presence of local shear failure reduces the ultimate bearing capacity of the soil.
- Therefore, this characteristic is consistent with local shear failure.
Conclusion:
The correct answer is option C: Failure is sudden. Local shear failure in soils is not characterized by a sudden failure, but rather occurs gradually as the applied load exceeds the shear strength of the soil.
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