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 24 for “"Ground deformations"”.
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Jacking Loads and Ground Deformations Associated With Microtunneling
Fr=Cag' dptanCfFAcL Adjustments are appropriate for effects of delays, steering corrections, dewatering, etc.
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Response of continuous pipelines to tunnel induced ground deformations
… and axial loads in a buried pipeline due to ground movements caused by tunnel construction in soft ground. The solutions combine closed-form, analytical solutions for tunnel-induced, free-field ground deformations in a plane orthogonal to the heading (Pinto and Whittle; 2001) with Winkler …
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Analytical methods to interpret ground deformations due to soft ground tunneling
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 2000.
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An investigation into the modeling of ground deformations induced by underground mining
The mechanisms of strata deformation due to underground mining were analyzed in an effort to better understand immediate roof behavior and surface displacements. Strata deformation characteristics above longwall and room-and-pillar mines in the eastern U.S. coalfields were evaluated and a numerical …
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Evaluation of analytical methods to interpret ground deformations due to soft ground tunneling
… of analytical solutions in describing ground movements induced by soft ground tunneling. The analytical solutions that were examined consider both isotropic and anisotropic stiffness parameters and were proposed by Pinto and Whittle (1999) and Chatzigiannelis and Whittle (2001) …
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Prediction of ground deformations caused by underground construction of the Tren Urbano in Rio Pierdras
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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The application of critical state soil mechanics to predict ground deformations below an embankment constructed on soft alluvium
… by up to eight metres of alluvium and made ground. The embankment was monitored during construction. Centreline settlements of the order of O.6m and horizontal movements at the embankment toe of up to O.1Sm were measured. The excess pore pressures generated during construction were found to …
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Ground movements during tunnelling in sand
During soft ground tunnel construction, if the face pressure of a tunnel boring machine is not strictly controlled, excessive ground movements will propagate vertically upwards causing significant damage to adjacent buried infrastructure and surface structures. In order to investigate the face …
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Pore Pressure Response and Ground Displacements in Chicago Clay During Tunneling and Over Long Term
The use of membrane influenced ground deformations around the tunnel mostly in the long term stage where it successfully (a) reduced dissipation rate of excavation-related excess pore pressure and thereby the rate of consolidation and (b) decreased both rate and magnitude of consolidation due to …
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Prediction of instability and ground movements during tunnel construction in non-homogenous conditions
… and greatly increased the productivity of underground construction projects. For shallow tunnels in 'soft ground', instabilities can create collapse mechanisms that propagate to the ground surface, while the prediction and control of tunnel-induced ground deformations remain a key challenge. …
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Three-dimensional finite element analysis of a complex excavation on the MIT campus
… element analysis in Plaxis 3D 2011 to simulate ground deformations, pore pressures, and diaphragm wall deflections for the very well instrumented excavation for the basement of the Stata Center on the MIT campus. The model predictions are compared with the field measurements that include …
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Earth pressure balance (EPB) tunneling induced settlements in the Tren Urbano Project, Rio Piedras, Puerto Rico
Underground construction of the Rio Piedras section of the Tren Urbano project involved the construction of twin tunnels (6.3m diameter) with Earth Pressure Balance machines in weathered alluvial soil. The depth of the cover over the tunnel crown varies from 13m to 10m. The twin tunnels, which …
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Three applications of satellite borne repeat pass SAR interferometry in Southern Africa
… mapping of Venus to the detection of subtle ground deformations due to earthquakes and mining subsidence. The InSAR technique involves using the phase information inherent in radar images to extract elevation and elevation change information. The process requires very careful co-registration …
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Effect of scale and spatial variability on surface foundation on sand
… settlement. Transitions in the mechanisms of ground deformations from general to punching modes are observed with changes in foundation size and sand void ratio. Model predictions of the bearing capacity factor, N[subscript gamma] are in good agreement with data reported from centrifuge model …
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Enhanced Anisotropic Bounding Surface Model: Implementation and Simulation of Excavation in Soft Cohesive Soils
… analysis for simulating deep excavation induced ground deformations. The first phase of this research illustrates efforts in integrating the enhanced anisotropic bounding surface model into finite element analysis (FEA) software. The implementations are validated against undrained isotropic and …
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Landslide-pipeline interaction for onshore slopes in silty sand
… interaction has been limited to horizontal ground and does not consider the inclined slope acting in multiple directions, as soil is redistributed and shears past the pipe, as is the case for pipes intersecting landslides. Physical modelling utilizing a drum centrifuge was undertaken to …
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High Spatial Resolution Measurement of Tendon Reinforcement in Underground Construction Works
… reinforcement responses that are induced by ground deformations can be characterized and quantified. This has been approached from an intrinsic sensing perspective, whereby several instrumenting procedures have been developed to directly couple fiber optic strain sensors with various …
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Prediction and interpretation of ground movements due to tunneling in stiff clay and impacts on adjacent structures
… around the precast lining in order to limit ground movements and potential damage to overlying structures. This thesis analyzes monitoring data from the Crossrail project involving twin tunnels construction using Earth Pressure Balance (EPB) machines in London Clay. The research focuses on …
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Measured performance of slurry walls
… site conditions (soil profile and properties, groundwater conditions and location of adjacent facilities etc.) and designs for support of the excavations. The main goal is to relate construction records to the measured performance of the lateral earth support systems. The principal parameters …
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Performance of Columnar Reinforced Ground during Seismic Excitation
… used today to improve performance of loose ground and remediate liquefaction problems. This research adopts a numerical approach to study seismic performance of soil-cement columnar reinforcements in loose sandy profiles. Different constitutive models were investigated in order to find a …
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