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 20 of 100 for “"Rock Mass"”.
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Jointed rock mass deformability : a probabilistic approach
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1979.
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INVESTIGATING THE IMPACT OF ROCK BRIDGES ON THE MECHANICAL BEHAVIOR OF JOINTED ROCK MASS USING LATTICE SPRING-BASED SYNTHETIC ROCK MASS (LS-SRM) APPROACH
<p>"Rock bridges were defined as a segment of intact rock that separates from discontinuities. Numerous studies are focused on developing methods to quantify their significance in rock mass strength and deformability behavior. This thesis aimed to enhance understanding of the effect of rock bridges …
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Numerical Validation and Refinement of Empirical Rock Mass Modulus Estimation
A sound understanding of rock mass characteristics is critical for the engineering prediction of tunnel stability and deformation both during construction and post-excavation. The rock mass modulus of deformation is a necessary input parameter for many numerical analysis methods to describe the …
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Revisiting Rock Mass Indices: Improving and Applying the Measurement of Erodibility
… exist to quantify erodibility that examine rock mass properties such as fracture characteristics and strength of intact rock. These systems can be used to predict such varied properties as the slope of a rock mass, the geometry of bedrock channels, and the likelihood and type of potential …
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A New Tool for Rock Mass Discontinuity Mapping from Digital Images: VTtrace
… this task could minimize human exposure to rockfalls, rockbursts or instabilities and facilitate the use of new methods of data visualization such as virtual environments. This research was undertaken to develop VTtrace; a semi-automatic fracture mapping algorithm based on image processing …
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Evaluation and Assessment of Inflow Rates in Tunnels Excavated in Jointed Rock Mass
… the coupled hydro-mechanical behavior within the rock fractures. The main concluding points of the study can be summarized as follows: (1) The hydro-mechanical behavior of the ring of tighter rock around the opening is similar to that of a semi-permeable liner, and the rate of water inflow into an …
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Automatic Extraction of Joint Characteristics from Rock Mass Surface Point Cloud Using Deep Learning
… of joint sets on 3D point cloud models of rock masses using deep learning is presented. The process starts with classifying joints on a 3D rock mass surface through training a deep network architecture and validated using manually labelled datasets. Then, individual joint surfaces are …
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AN IMPROVED ROCK MASS BEHAVIOR NUMERICAL MODEL AND ITS APPLICATIONS TO LONGWALL COAL MINING
TITLE: AN IMPROVED ROCK MASS BEHAVIOR NUMERICAL MODEL AND ITS APPLICATIONS TO LONGWALL COAL MINING The rock mass constitutive models should include elastic moduli, strength and stiffness of intact rock as well as those of joints and geometric properties of joints. The post-failure behavior of …
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Development of a Method for Measuring Rock Mass Air Permeability and Applications to Underground Mining
… concern to many Saskatchewan mining operations. Rock mass behavior and stability have been linked to the presence of groundwater and the inflow potential. An estimate of rock mass hydraulic properties is an important factor for assessing groundwater inflow potential and the effect this may have …
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The Influence of Pore Fluid on The Stability of a Rock Mass With a Weakened Zone
… 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 …
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Evaluation of rock mass properties and abutment stability at the Gillis Falls dam site, Carroll County, Maryland
Includes bibliographical references (pages 91-94).
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Site characterization using drone based photogrammetry
… site characterization is using drones for rock mass characterization through Structure from Motion (SfM) photogrammetry. This study highlights a series of surveys utilizing a DJI Mavic II drone performed between July and August 2022 at an abandoned quarry in Clear Creek Canyon Park, located …
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Geomechanical behaviour and deformation of coal mine roof strata around faults: toward an engineering geological model
… and adequate knowledge of spatial variation in rock mass condition are important prerequisites for mine planning and risk management in underground coal mines. In longwall mines in particular, evaluating and predicting geomechanical features and rock conditions ahead of mining is critically …
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Tomographic Imaging Associated with a Mw 2.6 Fault-Slip Event in a Deep Nickel Mine
… ability to accurately predict failure within a rock mass. Conventionally, numerical modeling is performed to predict the response of the rock mass due to excavation. However, numerical modeling relies heavily on the estimated physical characteristics of the rock mass. Unless dense, costly …
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Four-Dimensional Passive Velocity Tomography of a Longwall Panel
… technology that can be used to determine rock mass response to ore removal. Velocity tomography is accomplished by propagating seismic waves through a rock mass to measure velocity distribution of the rock mass. Tomograms are created by mapping this velocity distribution. From the velocity …
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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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Investigation of the Pre to Post Peak Strength State and Behaviour of Confined Rock Masses Using Mine Induced Microseismicity
As hard rock mining progresses into higher stress mining conditions through either late stage extraction or mining at depth, the rock mass is driven not just to the peak strength, but often well into the post-peak until complete ‘failure’ occurs and easier mining conditions become evident. Limited …
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Passive Seismic Tomography and Seismicity Hazard Analysis in Deep Underground Mines
… help understand and evaluate the stability of a rock mass in mining excavations. Lab measurements give evidence that velocities of seismic wave propagations increase in high stress areas of rock samples. It is well known that closing effects of cracks under compressive pressures tend to increase …
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