Real-time modelling and compensation of soil movements on underground sites

Información del proyecto

COSMUS

Identificador del acuerdo de subvención: BRPR960235

Proyecto cerrado

Fecha de inicio 1 Diciembre 1996

Fecha de finalización 31 Mayo 2000

Financiado con arreglo a

• Specific research and technological development programme in the field of industrial and materials technologies, 1994-1998

Coste total

Sin datos

Aportación de la UE

Sin datos

Coordinado por

Soletanche Entreprise SA
France

Objetivo

1. Recommendations for the analysis of drilling parameters recordings
2. 3D numerical model for the simulation of compensation grouting sites
3. Methods for the modelling of grouting
4. Methods for the modelling of shield tunnel
5. Software for the control of grouting on compensation grouting sites
6. Software for real-time monitoring of movements and internet communications.
7. Real-Time Observational Compensation Grouting process (OCG), including a real-time feedback between grouting operations and numerical simulations.
8. One prototype of fibre bragg-grating (FBG) industrial logging unit.
9. Prototypes of FBG strain sensors.
10. Prototypes of FBG inclinometers.
11. Prototypes of piezo-electric stretchers for fibre optics.
The construction of underground transports, particularly
in urban areas, is a potential source of major damages to
existing buildings and structures: soil movements caused
by underground excavations always propagate to the
surface, causing cracks and fissures to old buildings. In
order to face the growing need for underground transports
in overcrowded towns, it is necessary to develop a method
able to compensate for soil movements due to underground
excavations and to reduce significantly the social risks
accompanying these construction sites.

A new method, the ' Compensation Grouting ', is proposed
to assess and control the produced movements of existing
structures, with the objective to compensate
soil/structures movements and keep their variations
within +/ lmm. This method consists into
I) creating a 2D or 3D model of the site to predict soil
movements and design the compensation;
2) grouting into the soil a self hardening slurry when
the tunnels are excavated, under a constant and automated
control of grouting pumps, and a real time monitoring of
soils/structures movements;
3) continuously update the 3D model from observed
movements and from grouting results.

The project involves on one hand the development of 2D
and 3D modelling methods to characterise the soils, to
predict the effects of the excavations and to design the
required compensation grouting, and to compare every day
the observed measurements with expected results, in order
to adjust the model to reality. On the other hand, an
instrumentation and control system must be developed to
control the grouting plant with a high precision while
monitoring soil/structure displacements in real time,
with the objective to map displacements and to control
grouting operations every 30 seconds.

The accuracy of sensors currently used in civil
engineering sites is too poor to reach the objective;
moreover their thermal sensitivity is high and difficult
to compensate. New sensors have to be designed according
to user ' s specifications (cost, difficult environment,
and temperature variations). Therefore the project
includes the development of a fibre optics sensor
network, with a low cost and ruggedized demultiplexing
unit, and two new fibre optics sensors:
strain/displacement sensors to obtain a precision of 10
mm/m on vertical movements, and tiltmeters with a
precision of 0.05 mm/m (i.e. 10 seconds of arc).

The Consortium comprises two industrial end users: a
consulting engineer, specialised in the fields of
geotechnique and transport facilities development, and a
contractor specialised in grouting and foundations works.
It also comprises an industrial manufacturer and a
research organisation specialised in the field of fibre
optic sensors and networking. Two partners from
Universities will bring expertise on soil mechanics and
soil modelling, and on advanced ceramics materials for
the fibre optic network.

Ámbito científico (EuroSciVoc)

• ingeniería y tecnología › ingeniería eléctrica, ingeniería electrónica, ingeniería de la información › ingeniería electrónica › sistemas de automatización y control
• ingeniería y tecnología › ingeniería civil
• ingeniería y tecnología › ingeniería eléctrica, ingeniería electrónica, ingeniería de la información › ingeniería electrónica › sensores › sensores inteligentes
• ingeniería y tecnología › ingeniería de materiales › cerámica
• ciencias naturales › ciencias físicas › óptica › fibra óptica

Programa(s)

• FP4-BRITE/EURAM 3 - Specific research and technological development programme in the field of industrial and materials technologies, 1994-1998

Tema(s)

• 0104 - Safety and reliability of production systems

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

CSC - Cost-sharing contracts

Coordinador

Soletanche Entreprise SA

• Aportación de la UE: Sin datos
• Dirección: 6 rue de Watford ; 92000 Nanterre ; Francia
• Coste total: Sin datos

Participantes (5)

Commissariat à l'Energie Atomique

Francia

• Aportación de la UE: Sin datos
• Dirección: Ctr Etudes de Saclay - CE-S ; 91191 Gif-sur-Yvette
• Coste total: Sin datos

GLOETZL, GESELLSCHAFT FUER BAUMESSTECHNIK MBH

Alemania

• Aportación de la UE: Sin datos
• Dirección: Forlenweg 11 ; 76287 RHEINSTETTEN
• Coste total: Sin datos

SWISS FEDERAL INSTITUTE OF TECHNOLOGY LAUSANNE

Suiza

• Aportación de la UE: Sin datos
• Dirección: MX-G Ecublens ; 1015 LAUSANNE
• Coste total: Sin datos

Tractebel Development SA

Bélgica

• Aportación de la UE: Sin datos
• Dirección: 7,Avenue Ariane ; 1200 Bruxelles
• Coste total: Sin datos

University of Cambridge

Reino Unido

• Aportación de la UE: Sin datos
• Dirección: Trumpington Street ; CB2 1PZ Cambridge
• Coste total: Sin datos