Journal Title
Title of Journal: Bull Eng Geol Environ
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Abbravation: Bulletin of Engineering Geology and the Environment
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Publisher
Springer-Verlag
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Authors: Rohola Hasanpour Hamid Chakeri Yilmaz Ozcelik Hasan Denek
Publish Date: 2012/04/05
Volume: 71, Issue: 3, Pages: 499-510
Abstract
In urban areas the use of presupport in shallow tunnels is increasing in order to improve the excavation stability and reduce ground settlements induced by the tunneling This paper describes the effects of pipe roofing on surface settlements and evaluates the settlements associated with the twin tunnels in the Istanbul metro in terms of numerical semiempirical and measured values FLAC3D was used for the numerical modeling and the method suggested by Herzog for the semiempirical solution The numerical results indicate that the tunnel roof formed by the pipe roofing provides a restraining effect reducing deformation and ground surface settlement by up to 65 Herzog’s model yields higher maximum surface settlements than those observed When modified to include the effect of pipe roofing and the distance between the pipes however there is good agreement between the direct measurements and the values predicted by the numerical and modified Herzog modelsDans les zones urbaines l’utilisation de techniques de présoutènement pour les tunnels peu profonds se développe dans le but d’améliorer la stabilité en cours d’excavation et de diminuer les tassements des terrains résultant du creusement L’article décrit les effets des voûtesparapluie sur les tassements en surface et présente les tassements résultant du creusement du bitube pour le métro d’Istanbul mesurés ou calculés suivant des approches numériques et semiempiriques FLAC3D a été utilisé pour le modèle numérique et la méthode suggérée par Herzog pour la solution semiempirique Les résultats numériques indiquent que la voûtparapluie créée à l’avancement a un effet réducteur sur les déformations et le tassement en surface jusqu’à 65 Le modèle de Herzog conduit à des tassements maximum en surface plus importants que ceux observés Après prise en compte de la voûteparapluie et de la distance entre les forages de la voûteparapluie il apparaît un bon accord entre les mesures de tassement et les valeurs prévues par le modèle numérique ainsi qu’avec le modèle de Herzog modifié
Keywords:
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Other Papers In This Journal:
- Discontinuity networks in mudstones: a geological approach
- Comparison of the geotechnical properties of crushed shales from Southeastern Nigeria
- GIS-based landslide susceptibility mapping with logistic regression, analytical hierarchy process, and combined fuzzy and support vector machine methods: a case study from Wolong Giant Panda Natural Reserve, China
- Interactions of overburden failure zones due to multiple-seam mining using longwall caving
- Comparison of undrained shear strength by pressuremeter and other tests, and numerical assessment of the effect of finite probe length in pressuremeter tests
- Predicting mechanical properties of mudrock from index parameters
- Assessment of the adhesion potential of kaolinite and montmorillonite using a pull-out test device
- The unique relationship between swell percent and swell pressure of compacted clays
- Influence of rock cradle block geometry on rebound hardness
- BHE logging and cement hydration heat analyses for the determination of thermo-physical parameters
- Landslide investigations in the northwest section of the lesser Khingan range in China using combined HDR and GPR methods
- The geological strength index: applications and limitations
- Vulnerability assessment for reinforced concrete buildings exposed to landslides
- “Plagioclase solution degree index”: a new index to evaluate the weathering degree of granite
- Evaluation of waste embankment slope stability: Valea Manastirii, Gorj, Romania
- Evaluation of subsurface spatial variability in site characterization based on RCPTU data
- Assessment of the earthquake potential of the west Aegean region of Turkey based on seismicity, tectonics, crustal deformation and geo-archaeological evidence and its geotechnical aspects
- The effect of frost weathering at the dinosaur tracksite in Seoyu-ri, Hwasun, Korea
- Stabilisation of old lignite pit dumps in Eastern Germany
- Significance of outward dipping strata in argillaceous limestones in the area of the Three Gorges reservoir, China
- Slope stability problems of the weak rocks in the Asarsuyu pass of the Anatolian motorway
- Landslide susceptibility zonation study using remote sensing and GIS technology in the Ken-Betwa River Link area, India
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