scholarly journals Dynamic calibration and seismic validation of numerical models of URM buildings through permanent monitoring data

2021 ◽  
Author(s):  
Serena Cattari ◽  
Stefania Degli Abbati ◽  
Sara Alfano ◽  
Andrea Brunelli ◽  
Filippo Lorenzoni ◽  
...  
Keyword(s):  
Numerical Models ◽  
Monitoring Data ◽  
Dynamic Calibration

Tunnel behaviour associated with the weak Alpine rock masses of the Driskos Twin Tunnel system, Egnatia Odos Highway

2013 ◽  
Vol 50 (1) ◽  
pp. 91-120 ◽  
Author(s):  
N. Vlachopoulos ◽  
M.S. Diederichs ◽  
V. Marinos ◽  
P. Marinos
Keyword(s):  
Numerical Models ◽  
Three Dimensional ◽  
Monitoring Data ◽  
Tunnel Construction ◽  
Weak Rock ◽  
Rock Masses ◽  
Tunnel Excavation ◽  
Twin Tunnel ◽  
Geological Conditions ◽  
Weak Rock Masses

Based on the excessive deformations and support failure encountered during tunnel construction at the Driskos Twin Tunnel site in Northern Greece, this paper provides insight on how tunnels designed in such weak rock environments can be realistically analyzed with a view of determining better analytical tools to predict deformations and improving current design methods. Specific factors that were assessed include rock strength based on the geological strength index (GSI), tunnel deformation, numerical analysis techniques employed, three-dimensional model type, support considerations, dilation, sequencing of tunnel excavation, influence of single bore construction on twin bore, and homogenization of tunnel faces. This work involves the use of nominally identical two- and three-dimensional numerical models of tunnel sequencing for analytical simulation of weak material behaviour and sequential tunnel deformation response with the goal of investigating the strength and deformation of such weak rock masses. These have been used in combination with monitoring data that were obtained in the field during the Driskos Twin Tunnel construction. A discussion of the geological conditions, material property determination, monitoring data, and model calibration strategy is given. This paper provides insight into these issues and poses many more fundamental questions regarding the analysis of tunnel excavation within weak rock masses requiring further investigation.

scholarly journals Response Analysis of Deep Foundation Excavation and Dewatering on Surface Settlements

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Xian Li ◽  
Tingguo Zhou ◽  
Yixian Wang ◽  
Junling Han ◽  
Yanqiao Wang ◽  
...  
Keyword(s):  
Numerical Models ◽  
Surface Settlement ◽  
Monitoring Data ◽  
Response Analysis ◽  
Primary Concern ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Two Factors ◽  
Analytical Formulas ◽  
Surface Settlements

Accurate prediction of surface settlements is a primary concern when deep excavations were carrying out under the water table in urban environments for the safety of the work site. The sedimentation deformation due to deep excavation of foundation pit and dewatering occurs as a result of coupling action of the two factors. The study is aimed at revealing the coupling ground response to the two factors and developing empirical correlations for estimating ground deformations. Taking a deep foundation pit of a metro station as an example, surface settlement estimations were calculated by analytical formulas and numerical models. The settlement results by analytical formulas under excavation and dewatering conditions were added linearly to the total settlements. And three-dimensional coupling numerical models were established by applying commercial software (GMS and MIDAS) to investigate the interaction impact of excavation and dewatering on the sedimentation deformation. Comparing with monitoring data, numerical simulation results match well with the monitoring data. Furthermore, an empirical surface subsidence correlation equation was developed by the polynomial fitting to illustrate the effect contribution on the total surface settlement of foundation excavation and dewatering.

An Integrated InSAR-Borehole Inclinometer-Numerical Modeling Approach to the Assessment of a Slow-Moving Landslide

2021 ◽  
Author(s):  
Mirko Francioni ◽  
Doug Stead ◽  
Jayanti Sharma ◽  
John J. Clague ◽  
Marc-André Brideau
Keyword(s):  
Finite Difference ◽  
Slope Failure ◽  
Numerical Models ◽  
Limit Equilibrium ◽  
Integrated Approach ◽  
Slope Deformation ◽  
Equilibrium Analysis ◽  
Monitoring Data ◽  
Slow Moving ◽  
Slope Monitoring

ABSTRACT We use results of satellite-based interferometric synthetic aperture radar, Global Positioning System, and borehole inclinometer data to constrain numerical models that improve understanding of slope deformation at the Alexandria landslide, British Columbia, Canada. Surface monitoring data and borehole slope inclinometer measurements provide important insight into the slope failure mechanism. We initially analyzed the data in a geographic information system (GIS) to create thematic maps of the landslide area (hillshade, slope, and aspect), to identify key geological features, and to produce an engineering geomorphology map of the landslide. The monitoring data and the geological/engineering geomorphological models provide important constraints for two-dimensional landslide limit equilibrium and finite difference analyses. The initial limit equilibrium analysis improved understanding of the sliding surfaces. The finite difference models were then used to simulate and investigate the potential slope deformation mechanism. The combined slope monitoring/modeling results show that the Alexandria landslide is a slow-moving, multiple-block, retrogressive slope failure. The close agreement between the limit equilibrium and finite difference analyses, together with the satellite and ground-based slope monitoring and GIS data, highlight the importance of using a multidisciplinary/integrated approach in landslide studies.

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