A new rock mass failure criterion for biaxial loading conditions |
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Authors: | P H S W Kulatilake Jinyong Park Bwalya Malama |
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Institution: | (1) Department of Materials Science & Engineering, Geological Engineering Program, University of Arizona, Tucson, AZ 85721, USA |
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Abstract: | To simulate brittle rocks, a mixture of glastone, sand and water was used as a model material. Thin galvanized sheets of thickness
0.254 mm were used to create joints in blocks made out of the model material. To investigate the failure modes and strength,
both the intact material blocks as well as jointed model material blocks of size 35.6 × 17.8 × 2.5 cm having different joint
geometry configurations were subjected to uniaxial and biaxial compressive loadings. A new intact rock failure criterion is
proposed at the 3-D level. This criterion is validated for biaxial loading through laboratory experimental results obtained
on intact model material blocks. Results obtained from both the intact and jointed model material blocks are used to develop
a strongly non-linear new rock mass failure criterion for biaxial loading. In this failure criterion, the fracture tensor
component is used to incorporate the directional effect of fracture geometry system on jointed block strength. The failure
criterion shows the important role, the intermediate principal stress plays on rock mass strength. |
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Keywords: | anisotropy biaxial loading fracture tensor intermediate principal stress rock mass failure criteria |
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