the bearing capacity of layered soil constructions can be measured by continuous compaction control systems (CCC) during the soil compaction process by means of dynamically excited rollers. Roller drums make use of va...
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this paper presents two methods for the modelling of the stress and strain developments in the soil due to the installation of a displacement pile using the finite element method. the first is a workaround to incorpor...
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ISBN:
(纸本)0415408229
this paper presents two methods for the modelling of the stress and strain developments in the soil due to the installation of a displacement pile using the finite element method. the first is a workaround to incorporate the pile installation phase into a small strain finite element method, in this case PLAXIS. the second is a simulation of the installation in an Arbitrary Lagrangian Eularian numerical scheme. the results of bothmethods are compared with experimental results of a jacked pile in sand.
this paper presents a model to investigate the behavior of tunnels lining during fire on a structural level. Further emphasize has been drawn to the condition and stability of the supporting elements after fire. A num...
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the stability of sheet pile quay walls on a thick clay deposit against horizontal load was investigated through a series of centrifuge model tests. An area at the sea-side adjacent to the quay wall was improved with c...
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Deep mixed columns are commonly used to improve the bearing capacity and reduce settlements of structures on soft soils. the paper describes an enhanced two-dimensional technique, the so-called volume averaging techni...
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ISBN:
(纸本)0415408229
Deep mixed columns are commonly used to improve the bearing capacity and reduce settlements of structures on soft soils. the paper describes an enhanced two-dimensional technique, the so-called volume averaging technique to predict the settlements under an embankment load. the simulations of a unit cell of improved Vanttila clay are compared with traditional axisymmetric and fully three-dimensional calculations, using the S-CLAY IS model, a constitutive model that accounts for anisotropy, bonding and destructuration of the in situ soft soil. the differences of the numerical predictions following the three approaches are discussed.
Factors affecting the results of laboratory triaxial tests are among other things the height/diameter ratio of the specimen, the specimen end restraint and stiffness of the rubber membrane. their influence is very dif...
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ISBN:
(纸本)0415408229
Factors affecting the results of laboratory triaxial tests are among other things the height/diameter ratio of the specimen, the specimen end restraint and stiffness of the rubber membrane. their influence is very difficult or impossible to investigate under real circumstances, but theoretical and experimental studies on their effects are found in the literature. numericalmethods give, however, a possibility to have at least an estimate of their effect. this paper discusses the influence of these factors studied with Plaxis using a very fine element distribution. the present calculation results both agree and disagree withthe results obtained previously.
A pseudo 3D FE model has been developed to simulate nonlinear response of single piles under lateral loading. this procedure called Nonlinear Vertical Slices Model (NVSM) takes advantage of finite element 2D numerical...
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the factors of safety and the locations of critical failure surfaces obtained by limit equilibrium method and strength reduction method are compared for various slopes. For simple homogenous soil slopes, it is found t...
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ISBN:
(纸本)0415408229
the factors of safety and the locations of critical failure surfaces obtained by limit equilibrium method and strength reduction method are compared for various slopes. For simple homogenous soil slopes, it is found that the results from these two methods are generally in good agreement. there are however cases where great differences between the two methods may occur in some special circumstances which should be considered in analysis.
Civil engineering works in urban areas induce strains and displacements in the structures at the ground surface, which can create a wide range of damage (from cracks in the walls to loss of stability). Several factors...
ISBN:
(纸本)0415408229
Civil engineering works in urban areas induce strains and displacements in the structures at the ground surface, which can create a wide range of damage (from cracks in the walls to loss of stability). Several factors make it difficult to check that the planned works are likely or not to induce such damages: one of them is the fact that the exact location, depth and design of the foundations of structures built several decades (or more) ago are not always known with a good accuracy this paper presents a preliminary numerical simulation aimed at discussing the possibility of detecting the position and size of foundations in the ground by emitting a wave and recording the reflected signal.
the installation of diaphragm walls causes state changes and thus displacements in the adjacent ground. A diaphragm wall construction in Rotterdam, the Netherlands, is accompanied by an extensive monitoring program to...
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ISBN:
(纸本)0415408229
the installation of diaphragm walls causes state changes and thus displacements in the adjacent ground. A diaphragm wall construction in Rotterdam, the Netherlands, is accompanied by an extensive monitoring program to analyse the underlying mechanisms. Displacement and stress data are produced during the construction of the diaphragm wall panels and the excavation of the pit. In this paper the installation of the diaphragm wall panels is modelled using the Finite Element Methode (FEM) with an elastic-ideal-plastic model that includes the Mohr-Coulomb yield criterion (the Mohr-Coulomb model). the calculation results are discussed and compared with recorded monitoring data.
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