Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Rock failure"”.
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Experimental observations of rock failure due to laser radiation.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1969. M.S.
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Multiscale Integration of Empirical Geologic Observations with Quantitative Structural Modeling to Constrain Late Cretaceous to Eocene Paleostress Environments on the Colorado Plateau
… subject of interest to the geologic community as rock failure has important implications for storage and extraction of petroleum and mineral deposits, as well as sequestration efforts. The ability to relate patterns of rock deformation to stress conditions also permits geologists to better …
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Numerical investigation of polymer injection effects on geomechanical reservoir properties during enhanced oil recovery
… model is developed considering a heterogeneous rock properties distribution. A combination of water injection and polymer injection treatments is modeled at different injection rates. For the sensitivity analysis, the effective mean stress changes are compared at different times during the …
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Stress Redistribution in Berea Sandstone Samples Using Acoustic Emission Tomography in the Laboratory
… technique that can image the interior of a rock structure. To apply tomography to rock specimens, a propagation wave, which acts as a probe, is used. The propagation wave propagates from a source until it reaches a sensor on the surface of the rock specimen. Tomograms can then be generated …
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Modeling volcanic unrest by data assimilation
… to explore the response of the surrounding host rock to changes in the physical condition in a magmatic system. This work focuses on developing and applying a robust data-model fusion framework to investigate the mechanisms involved in volcanic unrest, such as deformation, failure, and pore fluid …
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Effects of borehole stability on well log data
… perpendicular to the borehole axis due to rock failure under high horizontal stresses. They are observed in three forms: as small scale irregularities of the borehole wall, as-near elliptical shapes oriented along the minimum in situ stress direction, and as an increase of borehole diameter …
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Numerical simulation of viscoelastic buckle folds: Implications for stress, fractures, porosity and fluid flow
… realistic in-situ stress conditions leading to rock failure. This study represents the first numerical simulation of folding under the consideration of gravity and pore pressure to simulate the structural development of buckle folds.</p> <p>The first topic covered in this dissertation is the …
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Defining Stress Changes Ahead of a Tunnel Face and Design of a Data Acquisition System
… accelerate in the future. Design of tunnels in rock is still largely empirical, while rock failure in underground mines and tunnel construction continues to claim lives. A seismic method to aid in increasing safety during excavation is tomography. Seismic tomography is a non-invasive technique …
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Laboratory Strength Testing of Argillaceous Limestone Under Varying Saturation, Scale, Loading Rate, and Confinement Conditions
… site is to be hosted in the Cobourg limestone, a rock formation which presents varying heterogeneity at different scales. The successful design of long-term nuclear waste storage requires engineered barriers and geology designed to safely and securely contain contaminants. The excavation of hard …
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Seismic Wave Velocity Variations in Deep Hard Rock Underground Mines by Passive Seismic Tomography
… the mining workplace because the behavior of the rock mass associated with mining-induced seismicity is poorly-understood. Passive seismic tomography is a tool with which the performance of a rock mass can be monitored in a timely manner. Using the tool of passive seismic tomography, the advance …
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Experimental investigation of damage evolution during strain burst in brittle rocks for deep mines
… under high-stress and high-temperature rock mass conditions. As a results of this, strain burst, which is the sudden and violent release of stored strain energy during dynamic brittle failure of rocks, has become more prevalent and created considerable safety risks damaging underground …
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Combined finite-discrete element modelling of key instabilities which characterise deep-seated landslides from massive rock slope failure
The expression “landslide from massive rock slope failure” (MRSF) is used to indicate large-scale landslides characterised by a variety of complex initial failure processes and unpredictable postfailure behaviour. In this context, deep-seated landslides are classified as “landslides from massive …
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Numerical modeling of seismic wave propagation in underground mines.
The phenomenon of rockburst damage localization, which is not well understood, has been observed in deep underground mines. Analysis of seismic wave propagation in underground mines is of great interest for improved understanding of the dynamic rock failure problem. This thesis aims at making a …