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Questions and Answers
What is the purpose of field tests for bearing capacity evaluation?
What is the purpose of field tests for bearing capacity evaluation?
Which factor affects the safe bearing capacity of a foundation?
Which factor affects the safe bearing capacity of a foundation?
Which method is used for soil exploration?
Which method is used for soil exploration?
What type of settlement is caused by consolidation?
What type of settlement is caused by consolidation?
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Which type of soil requires special guidelines for foundations?
Which type of soil requires special guidelines for foundations?
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Which method is commonly used to analyze the bearing capacity of soil?
Which method is commonly used to analyze the bearing capacity of soil?
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What is the settlement that occurs immediately after the construction of a foundation called?
What is the settlement that occurs immediately after the construction of a foundation called?
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What is the effect of the water table on the bearing capacity of soil?
What is the effect of the water table on the bearing capacity of soil?
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Study Notes
Purpose of Field Tests for Bearing Capacity Evaluation
- Field tests assess the actual bearing capacity of soil in situ, providing more accurate results than laboratory tests.
- They help identify site-specific variations in soil properties that affect foundation performance and safety.
Factors Affecting Safe Bearing Capacity of a Foundation
- Soil type: Cohesive and granulated soils differ significantly in strength and stability.
- Moisture content: Changes in moisture influence soil density and strength.
- Load conditions: The magnitude and type of loads applied (static or dynamic) affect capacity.
Methods for Soil Exploration
- Common soil exploration methods include borehole drilling, sampling, and in-situ tests like Standard Penetration Test (SPT).
- Geophysical methods such as seismic refraction and electrical resistivity can also be used for subsurface investigation.
Consolidation and Settlement
- Consolidation refers to the gradual settlement of soil due to the expulsion of water from its pores, leading to increased density over time.
- Primary consolidation is a major component causing long-term settlement in saturated cohesive soils.
Soil Types Requiring Special Guidelines for Foundations
- Expansive clay soils need additional considerations due to their significant shrink-swell behavior.
- Silty and organic soils often require special measures as they can exhibit unpredictable changes in strength with moisture variations.
Methods for Analyzing Bearing Capacity of Soil
- Limit State Method and Terzaghi-Wegman method are commonly used for calculating soil bearing capacity.
- Finite Element Method (FEM) provides a detailed analysis of complex soil behavior under load.
Immediate Settlement After Foundation Construction
- Immediate settlement is referred to as "elastic settlement," occurring quickly due to the load application on newly constructed foundations.
Effect of Water Table on Bearing Capacity of Soil
- A high water table can reduce soil effective stress, significantly lowering the bearing capacity.
- Seasonal variations in the water table must be considered in the design of foundations for long-term performance.
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Description
Test your knowledge on soil exploration and foundation requirements with this quiz. Learn about planning, exploration methods, soil sampling, rock drilling, core recovery, and field tests for evaluating bearing capacity. Module 2 focuses on bearing capacity analysis and failure. Put your knowledge to the test and see how well you understand these important concepts in foundation engineering.
