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Título del libro: Challenges And Innovations In Geotechnics: Proceedings Of The 18th International Conference On Soil Mechanics And Geotechnical Engineering, Vol 1
Título del capítulo: Numerical analysis of a tunnel intersection

Autores UNAM:
JUAN MANUEL MAYORAL VILLA; AZUCENA ROMAN DE LA SANCHA;

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Autores externos:

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Idioma:
Inglés

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Año de publicación:
2013

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Palabras clave:

Clay deposits; Deposits; Excavation; Finite difference method; Geotechnical engineering; Ground supports; Numerical models; Soil mechanics; Soils; Structures (built objects); Subway stations; 3d finite differences; Construction procedures; Construction technique; Earth pressure balance; Elasto-plastic models; Finite differences; Horizontal displacements; Metro station tunnel; Tunnels

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Resumen:

This paper presents a numerical study of the static behavior of the intersection of two major metro lines located in a soft lacustrine clay deposit overlaid by a very dense clayed sand deposit, in Mexico City. The intersection consists of a new tunnel excavated under an existing metro station-tunnel system, using the earth pressure balance, EPB, construction technique. This required the construction of a support structure for the station foundation. This structure was built inserting metallic beams under the foundation, and supporting these beams with metallic frames. In order to build the support structure, a couple of excavations were previously carried out at each side of the station foundation, using Milan walls. A 3D finite differences model was developed to simulate the construction procedure. An elasto-plastic model with a Morh-Coulumb failure criterion was used to represent the stressstrain soil behavior of the geomaterials found at the site. The vertical and horizontal displacements in the soil mass due to the construction of the support structure and the excavations of the tunnel were computed. From the numerical study, insight was gained regarding the behavior of this type of structures built in very soft clay.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9782859784744
Editorial:
PRESSES DES PONTS

Tipo de producto:
Conference Paper