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 31 for “"Soft Ground"”.
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Representing settlement for soft ground tunneling
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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A probabilistic approach to soft ground tunneling.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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Maneuverable penetration system for horizontal exploration in soft ground.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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Analysis of NATM and shield tunneling in soft ground
Demand for new underground transportation systems and utility networks has increased the use of tunneling in soft ground. Many of these tunnels have to be constructed in difficult soil conditions, with strict constraints on ground movement control. Technological advances, such as the pressurized …
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Three-dimensional analysis of surface settlement in soft ground tunneling
… on surface settlements above tunnels in soft ground. The finite element program "PLAXIS 3D Tunnel" was used to carry out the numerical analysis for the earth pressure balance (EPB) shield tunneling method in a saturated, normally consolidated clay. The two construction parameters that …
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Geosynthetic stabilization of unpaved roads on soft ground : a field evaluation
… geosynthetics in unpaved road construction over soft ground. The test site comprises five 16 m long, by 4.5 m wide test sections, built on a subgrade of undrained shear strength approximately 40 kPa. One is unreinforced and serves as a control section in the study, three sections include a …
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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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Finite element analysis of embankments on soft ground incorporating reinforcement and drains.
… for reinforced embankments constructed over soft compressible soils containing vertical drains. Secondly, to demonstrate the ability to model accurately such embankments. Finally, to develop simplified procedures to be used in the design of embankments over soft soils. The modifications to …
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A case study on the performance of embankments on treated soft ground
… involves construction of embankments overlying soft clay and peat deposits with very stringent requirements on the time frame of construction and allowable settlements. A field program of instrumented test embankments, referred to as No-Recess, has compared the performance of five schemes for …
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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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Developing a system to measure rheology of conditioned soil for soft-ground TBM tunneling
… rapid expansion of the tunneling and underground construction industry in the past few decades. Among all tunnel construction methods, the growth of soft-ground tunneling using Earth Pressure Balance (EPB) Tunnel Boring Machines (TBMs) has been the most significant. EPB TBMs use the …
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Parallel computation in efficient non-linear finite element analysis with applications to soft-ground tunneling project
Reliable prediction and control of ground movements represent an essential component of underground construction projects in congested urban environments, to mitigate against possible damage to adjacent structures and utilities. This research was motivated by the construction of a large underground …
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The Du Toitskloof Tunnel project : the construction of the (south) soft ground tunnel, Western Cape, South Africa
… on the excavation and construction of the soft ground tunnel, by means of artificial ground freezing for ground support and stabilisation. The soft ground section of the tunnel being situated at the Western portal, and forming approximately 168 metres of the four kilometre main tunnel. The …
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The hybrid of floating stone column by numerical and physical evaluation
… accommodation and infrastructure has resulted in soft ground being increasingly used in construction. Problems related to soft ground can be remedied by adopting a ground improvement technique. The stone column is one of the most effective and feasible techniques for soft clay soil improvement. …
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Guidelines for the Use of Expanded Polystyrene (eps)-Block Geofoam for the Function of Lightweight Fill in Road Embankment Projects
… alternative for construction of embankments over soft ground. The ultimate benefit of this is an optimization of both the technical performance as well as cost of EPS-block geofoam embankments. The research has confirmed that EPS-block geofoam can provide a safe and economical solution to problems …
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Stability of Levees and Floodwalls Supported by Deep-Mixed Shear Walls: Five Case Studies in the New Orleans Area
… improve the stability of levees constructed on soft ground is driven by the need to reduce levee footprints and environmental impacts and to allow for more rapid construction. Suitable methods for analysis and design of these systems are needed to ensure that the DMM technology is properly …
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Ground Movements Around Model Tunnels in Sand (Settlements, Shield, Photogrammetry)
… model, which simulated shield tunneling through soft ground, was developed and tested in dry sand. The test program was divided into four series of tests. In the O-, M-, and T-series, two concentrically placed circular tubes were used representing the model shield and model liner, respectively. …
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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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Factors Affecting Strength Gain and Development of a Laboratory Testing Procedure
Lime-cement columns were constructed to improve soft ground at the I-95/Route 1 Interchange in Alexandria, Virginia. As part of the test embankment program, two different commercial laboratories performed laboratory tests on treated soil, and they produced strikingly different unconfined …
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Utilização de geotêxteis como reforço de aterros sobre solos moles
… under the base of an access road on soft ground. The field trial was carried out along the access road for the construction of a second large trial embankment on vertical drains. This experimental program was a part of a large research program sponsored by the Highway Research …
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