{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71669"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71669","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The Influence of Pore Fluid on The Stability of a Rock Mass With a Weakened Zone","abstract":"The influence of the competing effects of dilatant hardening and diffusive softening on the stability of saturated rock is investigated. The analysis considers an infinite slab of fluid-infiltrated rock which contains a sublayer of weakened material. Inelastic deformation is allowed throughout the slab, with strain softening possible. The boundaries are loaded in plane strain by a uniform, constant compressive stress and a constant tangential displacement rate. The results of both a perturbation analysis and several numerical examples indicate that the deformation will localize in the sublayer at the interfaces. It is also found that the accelerating strain induces an increase in the influence of diffusion in the interface region, with the net effect being that the zone in which the deformation localizes is driven towards drained conditions. The numerical results suggest that ultimately, failure will instantaneously occur when the hardening modulus at the weakest point reaches the same value at which the dry response of the slab would become unstable. For the parameters chosen for the numerical examples, large scale inelastic dilation in the stronger rock was possible, and this dilatancy was found to increase the ultimate strength and final failure time beyond the values at which the dry rock would fail. However, under in situ conditions at tectonic strain rates, the numerical analysis suggests that the presence of a pore fluid will have little influence on earth faulting.","abstract_html":"The influence of the competing effects of dilatant hardening and diffusive softening on the stability of saturated rock is investigated. The analysis considers an infinite slab of fluid-infiltrated rock which contains a sublayer of weakened material. Inelastic deformation is allowed throughout the slab, with strain softening possible. The boundaries are loaded in plane strain by a uniform, constant compressive stress and a constant tangential displacement rate. The results of both a perturbation analysis and several numerical examples indicate that the deformation will localize in the sublayer at the interfaces. It is also found that the accelerating strain induces an increase in the influence of diffusion in the interface region, with the net effect being that the zone in which the deformation localizes is driven towards drained conditions. The numerical results suggest that ultimately, failure will instantaneously occur when the hardening modulus at the weakest point reaches the same value at which the dry response of the slab would become unstable. For the parameters chosen for the numerical examples, large scale inelastic dilation in the stronger rock was possible, and this dilatancy was found to increase the ultimate strength and final failure time beyond the values at which the dry rock would fail. However, under in situ conditions at tectonic strain rates, the numerical analysis suggests that the presence of a pore fluid will have little influence on earth faulting.","abstract_has_math":false,"creators":["Bowers, Glenn Lee"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Theoretical and Applied Mechanics","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T19:12:28Z","date_published":"2014-12-16T19:12:28Z","updated_at":"2026-07-22T22:26:05Z","subjects":["Applied Mechanics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8302813"],"render_values":[{"text":"(UMI)AAI8302813","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71669","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Bowers, Glenn Lee"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T19:12:28Z","10000-01-01","1982"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Theoretical and Applied Mechanics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Applied Mechanics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/71669","(UMI)AAI8302813"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The influence of the competing effects of dilatant hardening and diffusive softening on the stability of saturated rock is investigated. The analysis considers an infinite slab of fluid-infiltrated rock which contains a sublayer of weakened material. Inelastic deformation is allowed throughout the slab, with strain softening possible. The boundaries are loaded in plane strain by a uniform, constant compressive stress and a constant tangential displacement rate. The results of both a perturbation analysis and several numerical examples indicate that the deformation will localize in the sublayer at the interfaces. It is also found that the accelerating strain induces an increase in the influence of diffusion in the interface region, with the net effect being that the zone in which the deformation localizes is driven towards drained conditions. The numerical results suggest that ultimately, failure will instantaneously occur when the hardening modulus at the weakest point reaches the same value at which the dry response of the slab would become unstable. For the parameters chosen for the numerical examples, large scale inelastic dilation in the stronger rock was possible, and this dilatancy was found to increase the ultimate strength and final failure time beyond the values at which the dry rock would fail. However, under in situ conditions at tectonic strain rates, the numerical analysis suggests that the presence of a pore fluid will have little influence on earth faulting.","Made available in DSpace on 2014-12-16T19:12:28Z (GMT). No. of bitstreams: 1 8302813.pdf: 2808768 bytes, checksum: 441992dd8cf2742d81bb39a4533ae67a (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 71835 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","117 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."]},{"key":"dc:title","label":"Title","values":["The Influence of Pore Fluid on The Stability of a Rock Mass With a Weakened Zone"]}]}],"canonical_facts":{"dc:creator":["Bowers, Glenn Lee"],"dc:date":["2014-12-16T19:12:28Z","10000-01-01","1982"],"dc:description":["The influence of the competing effects of dilatant hardening and diffusive softening on the stability of saturated rock is investigated. The analysis considers an infinite slab of fluid-infiltrated rock which contains a sublayer of weakened material. Inelastic deformation is allowed throughout the slab, with strain softening possible. The boundaries are loaded in plane strain by a uniform, constant compressive stress and a constant tangential displacement rate. The results of both a perturbation analysis and several numerical examples indicate that the deformation will localize in the sublayer at the interfaces. It is also found that the accelerating strain induces an increase in the influence of diffusion in the interface region, with the net effect being that the zone in which the deformation localizes is driven towards drained conditions. The numerical results suggest that ultimately, failure will instantaneously occur when the hardening modulus at the weakest point reaches the same value at which the dry response of the slab would become unstable. For the parameters chosen for the numerical examples, large scale inelastic dilation in the stronger rock was possible, and this dilatancy was found to increase the ultimate strength and final failure time beyond the values at which the dry rock would fail. However, under in situ conditions at tectonic strain rates, the numerical analysis suggests that the presence of a pore fluid will have little influence on earth faulting.","Made available in DSpace on 2014-12-16T19:12:28Z (GMT). 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