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The Effect of Thickness of Filling on Shear Behavior of Discontinuous

Nafisi, Ashkan | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45484 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadaghiani, Mohammad Hossin
  7. Abstract:
  8. The need to build underground structures like tunnels, oil reservoirs are increasing and it requires a good knowledge of behavior of mass rock, exact data and parameters for safe and economic design. Filling materials which usually transfer with water into the joints reduce shear strength of joints significantly and change the behavior of the joints. To evaluate shear behavior of filled joints, 24 tests were conducted with large scale direct shear test apparatus on model rock joints with a regular “saw tooth” surface profile with the dimensions of 15cmx15cmx18cm. Filled material had specified specifications like particles size and strength parameters.
    Infill thickness, moisture content of filling material, normal stress and compressive strength of joint models had varied parameters in this investigation. According to the acquired results, shear strength of filled joints reduces with increasing infill thickness and when thickness of infill is more than roughness amplitude, the shear behavior of joints are governed by the infill material. With increasing normal stress, shear strength of filled joints increased and it occurred in smaller shear displacement. Increasing moisture content of filling material caused reducing of shear strength. Also shear strength of joint, increased with increasing of compressive strength of joint model
  9. Keywords:
  10. Shear Behavior ; Infilled Joins ; Infill Thickness ; Moisture Content of Filling Material

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