CIVE1105 Foundations on rock

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  1. Some examples of potential failure mode
    • a.) settlement due to compression of soft seams and intact rock
    • b.) shear & deformation of fractured rock mass
    • c.) side-wall bond strength
    • d.) shear strength of a rock - grout interface
    • e.) shear failure on a continuous fracture dipping outof the face
    • f.) punching failure of a thin bed of rock overlying weaker material
    • (page 8, week 8)
  2. Four important properties of discontinuities that affect the foundation stability:
    • 1. Orientation
    • 2. Position
    • 3. Length
    • 4. Spacing.
  3. Types of rock foundations
    • a.) Footing on rock
    • b.) End-bearing piles on rock
    • c.) A pier socketed into rock
  4. Consideration in design of rock foundations
    • 1) Potential failure mode
    • 2) Bearing capacity of rock. Building codes or where rock conditions do not match descriptions in the codes, it is more appropriate to use limit equilibrium or numerical methods incorporating appropriate rockmass strength parameters.
    • 3) Building codes. Which list allowable bearing pressure for various rock types
  5. Four methods of designing bored piles founded on rock
    • 1) Semi-empirical methods
    • 2) Bearing capacity theories
    • 3) Use of presumptive bearing values from codes
    • 4) In-situ tests
  6. Qult or ultimate load capacity has two parts:
    Shaft friction (Qf) and end bearing at base or tip (Qb)
  7. Allowable load capacity
    • Qa = Qu / FoS
    • FoS >= 2
  8. Rock socket design. 2 requirements
    • 1. Bearing capacity
    • 2. Settlement
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CIVE1105 Foundations on rock
2013-06-25 12:35:09

Description Week 8 lecture notes summary. Exam
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