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Evaluating Shear Strength of Irregular Soft Rock Joints by Direct Shear Test and Rock Joints Shear Strength Models
Bagherzadeh, Hossein | 2015
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 46989 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Sadagiyani, Hossein
- Abstract:
- Shear strength of rock joints is one of most important aspect of applied rock mechanics. Shear strength prediction models have been proposed by many authors like Patton, Ladany, Papaliangas, Maksimovic, and Grasseli. Purpose of this thesis is inspection of Shear strength of soft irregular rock joints which built by adding one or two irregularities on a regular profile. Twenty artificial irregular rock joint samples by mixing water and stucco have been built. Then samples were tested by direct shear test on constant normal load condition and their shear properties were recorded. According result, recent models have perfectly predicted sample behavior and generated shear failure envelop just like samples. In all conditions Maksimovic model have better compatibility than Papalian gas model, but two models were able to predict form and size of failure envelop. Grasseli Model was able to predict better in some cases, were two other models having significant incompatibility. Therefore Grasseli Model seems to be more comprehensive than two other models. Finally irregularities affect all aspect of shear behavior of joints, but the influence percent increase or decrease by location of irregularities. In some cases the position of irregularities with confining leads to different failure mechanism and unconventional failure envelop
- Keywords:
- Shear Strength ; Rock Mass ; Direct Shear ; Shear Behavior ; Failure Envelop ; Irregular Joints
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