| Description |
ix, 117 leaves : illustrations ; 29 cm |
| Summary |
"The strain conditions around statically loaded circular openings in rock-like materials and corresponding cavity-wall displacements were determined experimentally with resistance strain gages. The models were fabricated with lined and unlined openings simulating underground tunnels. Tests were performed with models of two different materials in plane stress and plane strain. Rock-like materials were designed and the strain gages were embedded at selected points within each model. The models often failed by tensile splitting through the opening early in the loading cycle causing the strains at certain points to deviate considerably from the theoretical values. Tangential strains on the vertical axis were usually tensile although most predicted values were compressive. The stress concentration around the opening was not always a critical factor in the structural failure of the model"--Abstract, leaf ii. |
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