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Finite Element Modelling of Tunnel Settlements Under Cyclic Loading
Worldwide, more and more areas with soils of low bearing capacity and low stiffness, as is the case of fine-grained soils, have to be accessed. Investigations of the ultimate limit state and in particular the serviceability of geotechnical structures on soft soils by means of numerical methods require the use of sophisticated material models which accurately reproduce the specific material behaviour of these soils. In the present study a constitutive model, which is claimed to describe the soft soil behavior under monotonic as well as cyclic loading is tested. The most important tool defining the operations within this model is the evolving (in magnitude) and rotating (anisotropic) historiotropic flow surface, which accounts i.a. for the induced anisotropy (thus preloading and history of the soil) as well as for the degradation of the shear modulus. The application example comprises the forecast of the accumulated deformations due to cyclic loading of Metro Line No. 4 in Shanghai after various time-steps. It has been shown that the model can be used during the monitoring process of a construction site as well, while providing accurate predictions of long-term settlements.
Finite Element Modelling of Tunnel Settlements Under Cyclic Loading
Worldwide, more and more areas with soils of low bearing capacity and low stiffness, as is the case of fine-grained soils, have to be accessed. Investigations of the ultimate limit state and in particular the serviceability of geotechnical structures on soft soils by means of numerical methods require the use of sophisticated material models which accurately reproduce the specific material behaviour of these soils. In the present study a constitutive model, which is claimed to describe the soft soil behavior under monotonic as well as cyclic loading is tested. The most important tool defining the operations within this model is the evolving (in magnitude) and rotating (anisotropic) historiotropic flow surface, which accounts i.a. for the induced anisotropy (thus preloading and history of the soil) as well as for the degradation of the shear modulus. The application example comprises the forecast of the accumulated deformations due to cyclic loading of Metro Line No. 4 in Shanghai after various time-steps. It has been shown that the model can be used during the monitoring process of a construction site as well, while providing accurate predictions of long-term settlements.
Finite Element Modelling of Tunnel Settlements Under Cyclic Loading
Lecture Notes in Civil Engineering
Barla, Marco (editor) / Di Donna, Alice (editor) / Sterpi, Donatella (editor) / Insana, Alessandra (editor) / Tafili, Merita (author) / Wichtmann, Torsten (author)
International Conference of the International Association for Computer Methods and Advances in Geomechanics ; 2022 ; Turin, Italy
2022-07-31
8 pages
Article/Chapter (Book)
Electronic Resource
English
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