Fracture of sedimentary rocks under a complex triaxial stress state |
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Authors: | V I Karev D M Klimov Yu F Kovalenko K B Ustinov |
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Institution: | 1.Ishlinsky Institute for Problems in Mechanics,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Most sedimentary rocks have layered structure, and their strength properties are therefore anisotropic; as a consequence, the rock strength depends on the direction of the applied stresses. In this case, various fracture mechanisms are possible. The following two possible fracture mechanisms are considered: actions along the bedding planes, which are weakening surfaces, and along the planes where stresses exceeding the total rock strength are attained. A triaxial independent loading test bench was used to study the fracture conditions for layered rocks composed of productive oil-and-gas strata in complex true triaxial loading tests. The study shows a good qualitative agreement between experimental results and theoretical estimates. |
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