Analisis comparativo entre mediciones de monitoreo geotécnico y modelación numérica para tunel interestación excavado en suelos finos de santiago [Benchmarking study between geotechnical monitoring and numerical analysis for tunnels build in fine soils of Santiago]
File(s)
Published version
Author(s)
Leal, Fabian
Pozo, J
Solans Roa, David
Type
Conference Paper
Abstract
The construction project of the new Santiago Metro Line 3, is being built by the construction method NATM (New
Austrian Tunneling Method), in which the topographical and geotechnical monitoring is critical during the construction stages (shafts, tunnels and galleries).
Along the route of the project, it can mainly find two types of soils: "Gravas del Rio Mapocho" and fine-grained soils (that can be separated in fine soils of the North of Santiago and alluvial fans deposits located to the East).
This paper presents the surface settlements obtained by numerical 3D models of a tunnel dug in fine soils of Santiago, in which it made a sensitivity of deformation modulus (Es) and the ratio of vertical and horizontal stresses at rest, parameters that were previously identified was performed as the greatest influence on the deformations induced by tunneling.
The results of this sensitivity are compared with measurements obtained through geotechnical monitoring performed during the construction of tunnels in the same geometry and soil type. The numerical model is performed using the three-dimensional software FLAC 3D finite difference through the Cap-Yield (Cysoil) constitutive model, with which the stress-strain behavior of soil and interaction with structural elements is simulated. Meanwhile, geotechnical monitoring measurements were made using high-precision topography.
Finally, pairs of parameters (Es and K0) that best fit the model delivered by the measured field are given, the results
obtained are analyzed and the causes of possible differences are discussed.
Austrian Tunneling Method), in which the topographical and geotechnical monitoring is critical during the construction stages (shafts, tunnels and galleries).
Along the route of the project, it can mainly find two types of soils: "Gravas del Rio Mapocho" and fine-grained soils (that can be separated in fine soils of the North of Santiago and alluvial fans deposits located to the East).
This paper presents the surface settlements obtained by numerical 3D models of a tunnel dug in fine soils of Santiago, in which it made a sensitivity of deformation modulus (Es) and the ratio of vertical and horizontal stresses at rest, parameters that were previously identified was performed as the greatest influence on the deformations induced by tunneling.
The results of this sensitivity are compared with measurements obtained through geotechnical monitoring performed during the construction of tunnels in the same geometry and soil type. The numerical model is performed using the three-dimensional software FLAC 3D finite difference through the Cap-Yield (Cysoil) constitutive model, with which the stress-strain behavior of soil and interaction with structural elements is simulated. Meanwhile, geotechnical monitoring measurements were made using high-precision topography.
Finally, pairs of parameters (Es and K0) that best fit the model delivered by the measured field are given, the results
obtained are analyzed and the causes of possible differences are discussed.
Date Issued
2016-12-05
Date Acceptance
2016-11-01
Citation
IX Chilean Geotechnical Conference, 2016
Publisher
ISSMGE
Journal / Book Title
IX Chilean Geotechnical Conference
Copyright Statement
© 2016 The Author(s) published under exclusive license by
ISSMGE.
ISSMGE.
Source
IX Chilean Geotechnical Conference
Publication Status
Published
Start Date
2016-12-05
Finish Date
2016-12-07
Coverage Spatial
Valdivia, Chile