Chapter 6: Foundations

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Questions and Answers

What method is commonly used to observe and measure soil qualities, water table, and frost line?

  • Test bores
  • Geotechnical surveys
  • Test wells
  • Test pits (correct)

Which of the following properties is NOT typically considered in assessing soil?

  • Density
  • Composition (correct)
  • Consistency
  • Texture

What do shallow foundations directly transfer to the soil?

  • Building weight (correct)
  • Frost line depth
  • Soil porosity
  • Water table level

Influential variables for the frost line depth include all of the following EXCEPT:

<p>Building height (B)</p> Signup and view all the answers

What do strata refer to in terms of soil layers?

<p>The different layers of rock or earth found above and below (A)</p> Signup and view all the answers

Which of the following is matched to the loads supported above them in shallow foundations?

<p>Wall footing (C)</p> Signup and view all the answers

What kind of structures use reinforced concrete footings in shallow foundations?

<p>Buildings with limited space (B)</p> Signup and view all the answers

'Strata' refers to which of the following in terms of soil assessment?

<p>'Sheet-like layers of rock or earth' (C)</p> Signup and view all the answers

'Water table' in soil assessment refers to which of the following?

<p>'Level of ground water saturation of subsurface materials' (D)</p> Signup and view all the answers

What is one way to determine soil properties, water table, and frost line?

<p>Test pits (B)</p> Signup and view all the answers

What is a mat slab foundation?

<p>A thick slab beneath the entire area of a building (D)</p> Signup and view all the answers

What is the purpose of a wall footing in a building?

<p>To distribute the weight of a wall on the bearing soil (C)</p> Signup and view all the answers

What is the function of a column footing?

<p>Supports a column (C)</p> Signup and view all the answers

What is the purpose of pile foundations?

<p>Support a load by transferring it through friction with the surrounding soil or contact with rock (D)</p> Signup and view all the answers

When is a mat slab foundation suitable for use?

<p>When the load-bearing capacity of the soil is insufficient for heavy weights (C)</p> Signup and view all the answers

What distinguishes a grillage footing from other types of footings?

<p>Consists of layers of beams placed at right angles to each other and encased in concrete (C)</p> Signup and view all the answers

In what situations are deep foundations typically used?

<p>Where shallow foundations cannot be utilized (C)</p> Signup and view all the answers

What is the function of piers in foundation construction?

<p>To transfer the weight of the structure to the ground (A)</p> Signup and view all the answers

What are caissons in foundation construction?

<p>Method of construction for piers (A)</p> Signup and view all the answers

How do floating foundations distribute weight?

<p>By ensuring the weight of soil removed equals the weight of the building (D)</p> Signup and view all the answers

What type of foundation walls are made of concrete and masonry?

<p>Stone (A)</p> Signup and view all the answers

Which foundation wall type is most suitable for light frame construction?

<p>Wood (D)</p> Signup and view all the answers

What is the purpose of using Expanded Polystyrene (EPS) in foundation walls?

<p>To provide insulation (C)</p> Signup and view all the answers

Settlement of a foundation can result in which of the following?

<p>Distorted building frame (D)</p> Signup and view all the answers

What is the role of underpinning in relation to a foundation?

<p>To strengthen an existing foundation permanently (C)</p> Signup and view all the answers

Which material is NOT typically used in the construction of foundation walls?

<p>Steel Beams (A)</p> Signup and view all the answers

What is the primary function of shoring in construction?

<p>To offer temporary support (A)</p> Signup and view all the answers

What may result from differential settlement of a foundation?

<p>Significant misalignment of structural members (B)</p> Signup and view all the answers

What is the primary purpose of using hollow foam blocks in Insulated Concrete Form (ICF) construction?

<p>To provide insulation and structural support (D)</p> Signup and view all the answers

Which of the following is a common symptom of building settlement?

<p>Sloped floors (C)</p> Signup and view all the answers

What is the primary purpose of using mat slab foundations?

<p>To evenly distribute the weight of the entire building (A)</p> Signup and view all the answers

Which of the following best describes a wall footing?

<p>A wide, thick area supporting the weight of a wall on the soil (C)</p> Signup and view all the answers

In foundation construction, what is the main function of piers?

<p>To transfer the weight of the structure to the ground (C)</p> Signup and view all the answers

Why are timber piles still used in some cases for foundation support?

<p>To transfer loads through friction with the surrounding soil (B)</p> Signup and view all the answers

What distinguishes a grillage footing from other types of footings?

<p>It consists of layers of beams placed at right angles and encased in concrete (D)</p> Signup and view all the answers

What role do deep foundations play when shallow foundations cannot be used?

<p>They penetrate soil directly under a building to reach stable layers that can support the weight (A)</p> Signup and view all the answers

How do floating foundations ensure stability for a building?

<p>By equally distributing the weight below and above the bearing surface (B)</p> Signup and view all the answers

When are piles typically used in foundation construction?

<p>To transfer loads through friction with the surrounding soil (D)</p> Signup and view all the answers

What is a common characteristic of post-and-pier foundations?

<p>They consist of upright posts mounted to wedge-shaped concrete piers (A)</p> Signup and view all the answers

Why might caissons be mentioned in foundation construction?

<p>To describe a method of construction for piers (C)</p> Signup and view all the answers

What is the maximum depth that test pits can reach when assessing soil properties?

<p>2.5 meters (C)</p> Signup and view all the answers

In foundation construction, what is the primary role of reinforced concrete footings in shallow foundations?

<p>To transmit the building's weight to the soil (B)</p> Signup and view all the answers

What is the main factor influencing the common depth at which soil water freezes, known as the frost line?

<p>Climate (D)</p> Signup and view all the answers

What do specialized footings in shallow foundations aim to match with the loads supported above them?

<p>Building lateral forces (A)</p> Signup and view all the answers

What do test borings provide information on that test pits may not reach deep enough to observe?

<p>Bearing capacity of soil (C)</p> Signup and view all the answers

Which factor influences the highest level of groundwater saturation in subsurface materials, known as the water table?

<p>Season (B)</p> Signup and view all the answers

In foundation construction, what are shallow foundations primarily responsible for in relation to the building's weight?

<p>Transmitting it directly to the soil (B)</p> Signup and view all the answers

What type of layer does 'stratum' refer to when describing rock or earth in soil layers?

<p>'<em>Strata</em>' with different characteristics (C)</p> Signup and view all the answers

Which type of foundation walls may develop visible cracks over time but usually do not significantly affect their load-bearing ability?

<p>Concrete and Mortared Masonry (C)</p> Signup and view all the answers

What kind of deformation is associated with 'heaving' in a building's structural elements?

<p>Upward (D)</p> Signup and view all the answers

Which foundation wall type is usually found only in older buildings and may or may not include mortar in its construction?

<p>Stone (B)</p> Signup and view all the answers

What is the primary reason for underpinning an existing foundation?

<p>Excessive settlement (C)</p> Signup and view all the answers

Which construction technique uses hollow foam blocks filled with concrete to create structural supports?

<p>Insulated Concrete Form (ICF) construction (B)</p> Signup and view all the answers

What is the term used for the downward deformation of a building's structural elements?

<p>Settlement (A)</p> Signup and view all the answers

'Shoring' in construction refers to which type of supports?

<p>Temporary supports (A)</p> Signup and view all the answers

'Differential settlement' can result in significant misalignment of structural members due to which of the following?

<p>'Footings of different sizes' (C)</p> Signup and view all the answers

How are Expanded Polystyrene (EPS) blocks used in foundation walls?

<p>To create an insulated concrete form (B)</p> Signup and view all the answers

What is the main material used in Insulated Concrete Form (ICF) construction?

<p>Hollow foam blocks (C)</p> Signup and view all the answers

What do test pits provide information on that test borings may not reach deep enough to observe?

<p>Soil strata and water table (B)</p> Signup and view all the answers

Which factor determines the depth of foundations?

<p>Lateral forces (D)</p> Signup and view all the answers

What influences the common depth at which ground water in soil will freeze, known as the frost line?

<p>Climate (C)</p> Signup and view all the answers

What do shallow foundations primarily transfer the weight of the building to?

<p>Soil at the base of the building (A)</p> Signup and view all the answers

What do specialized types of footings in shallow foundations aim to match with the loads supported above them?

<p>Loads supported above them (A)</p> Signup and view all the answers

Which type of foundation depth is influenced by lateral forces and building codes?

<p>Deep foundations (A)</p> Signup and view all the answers

What influences the highest level of ground water saturation of subsurface materials?

<p>Seasonal changes (A)</p> Signup and view all the answers

What do test borings provide information on regarding soil properties?

<p>Soil bearing capacity (A)</p> Signup and view all the answers

What is the main function of reinforced concrete footings in shallow foundations?

<p>Distributing pressure across a larger area (B)</p> Signup and view all the answers

What does water table refer to in relation to subsurface materials?

<p>Highest level of groundwater saturation (A)</p> Signup and view all the answers

What type of foundation has a thick slab beneath the entire area of a building?

<p>Simple slabs (A)</p> Signup and view all the answers

Which foundation type uses a system of upright posts mounted to wedge-shaped concrete piers for transferring the weight of the structure to the ground?

<p>Piers (B)</p> Signup and view all the answers

What is characteristic of caissons in foundation construction?

<p>Method of construction for piers (C)</p> Signup and view all the answers

In foundation construction, what distinguishes a mat slab foundation from a simple slab foundation?

<p>Heavily reinforced with steel (D)</p> Signup and view all the answers

What distinguishes wall footing from column footing in shallow foundations?

<p>Wide and thick area for wall support (D)</p> Signup and view all the answers

What type of foundation is designed to transmit loads over a wider area similar to a column footing?

<p>Grillage Footing (A)</p> Signup and view all the answers

When the load-bearing capacity of the soil is insufficient for heavy weights, what must be done with the footing?

<p>Make the footing large enough to spread out the weight (D)</p> Signup and view all the answers

'Belled' piers are associated with which type of foundation elements?

<p>'Post-and-pier' systems (D)</p> Signup and view all the answers

'Floating foundations' ensure stability by:

<p>Maintaining the weight supported by each soil layer (A)</p> Signup and view all the answers

What distinguishes 'deep foundations' from 'shallow foundations'?

<p>Penetrating layers to reach rock or stable soil for support. (D)</p> Signup and view all the answers

What is the primary difference between shoring and underpinning in construction?

<p>Shoring refers to temporary supports, while underpinning refers to permanent supports (D)</p> Signup and view all the answers

Which foundation wall type may be found in older buildings and does not necessarily include mortar?

<p>Stone (C)</p> Signup and view all the answers

What is the main function of caissons in foundation construction?

<p>To keep water out of an excavation for a pier (C)</p> Signup and view all the answers

Which symptom might indicate significant structural damage due to building settlement?

<p>Distorted building frame (B)</p> Signup and view all the answers

What type of construction technique uses hollow foam blocks filled with concrete to form structural supports?

<p>Insulated Concrete Form (ICF) construction (D)</p> Signup and view all the answers

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