Geotechnical modeling at the city scale using statistical and geostatistical tools: The Pessac case (France)

Marache, Antoine; Breysse, Denys; Piette, C.; Thierry, P.

doi:10.1016/j.enggeo.2009.04.003

Cited by 51 publications

(18 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We focus on the case of a particular construction site where differential settlement may occur due to a low stiffness zone or the shrinkage of clayey soil on the site. This can be observed on the alluvial terraces where changes between sand and clay and the presence of clayey lenses are common (Marache et al 2009;Denis et al 2011).…”

mentioning

confidence: 93%

Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Imanzadeh¹,

Denis²,

Marache³

2014

Geotech Geol Eng

Self Cite

View full text Add to dashboard Cite

In conventional design, continuous spread footings are always designed on the basis of their transverse behavior, where the natural variability of soil properties and any uncertainties in the geometrical and mechanical properties of the structure are usually not considered. In order to reveal the effects of these uncertainties and the soil variability on the behavior of spread footings, the longitudinal direction needed to be studied. Numerous mechanical models, which describe the soil-structure interaction as a beam on elastic foundation, were developed. The common parameter between these models is the subgrade reaction coefficient which depends on numerous parameters. In this paper, the FOSM method was used, first on four semi-empirical models which give the subgrade reaction coefficient, and secondly on the analytical solution of a beam from Winkler's hypothesis including different boundary conditions. Uncertainties in the subgrade reaction coefficient, differential settlement and bending moment were obtained for the following case: continuous wall footing in residential construction, where a low stiffness zone or shrinkage of clayey soil is possible. Results from a global uncertainty analysis demonstrated the major effects of uncertainties in soil modulus; Poisson's ratio and width of the spread footing on the uncertainty of the subgrade reaction coefficient, and thus on uncertainties of the differential settlement and bending moment. Finally, it was shown that when the soil modulus and geometrical dimensions of the foundations are uncertain and where a zone of weak soil or shrinkage of clayey soils are present, the longitudinal behavior of continuous spread footings for residential construction should also be considered in their design.

show abstract

mentioning

confidence: 93%

Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Imanzadeh¹,

Denis²,

Marache³

2014

Geotech Geol Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…A DEM from the National Geographical Institute (IGN) with 25×25 m 2 resolution (1 m precision in elevation) defines the topography. Because this model was not sufficiently accurate, the DEM was supplemented with data that are more accurately provided by the topographic data from a large number of boreholes to improve accuracy (Guekie Simo 2012; Marache et al 2009). …”

Section: Topographic Datamentioning

confidence: 99%

Investigação geoestatística para um adequado mapeamento do nível do lençol freático: o caso de Bordéus (França)

2015

View full text Add to dashboard Cite

Methodologies have been developed to establish realistic water-table maps using geostatistical methods: ordinary kriging (OK), cokriging (CoK), collocated cokriging (CoCoK), and kriging with external drift (KED). In fact, in a hilly terrain, when piezometric data are sparsely distributed over large areas, the water-table maps obtained by these methods provide exact water levels at monitoring wells but fail to represent the groundwater flow system, manifested through an interpolated water table above the topography. A methodology is developed in order to rebuild water-table maps for urban areas at the city scale. The interpolation methodology is presented and applied in a case study where water levels are monitored at a set of 47 points for a part urban domain covering 25.6 km 2 close to Bordeaux city, France. To select the best method, a geographic information system was used to visualize surfaces reconstructed with each method. A cross-validation was carried out to evaluate the predictive performances of each kriging method. KED proves to be the most accurate and yields a better description of the local fluctuations induced by the topography (natural occurrence of ridges and valleys).

show abstract

“…The statistical evaluation of previous field information can provide useful results for new engineering-geologic (or geotechnical) projects. Due to engineering requirements, geostatistical methods also help in optimizing data sets (Marache et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…The geostatistical parameters of previous data can be used to identify the different geologic units, and graphically plot them as engineering-geologic maps (Marache et al 2009). This is useful when the investigated area has a more complex geology.…”

Section: Discussionmentioning

confidence: 99%

Engineering geologic evaluation of overcompacted claystone, new metro line, Budapest

Barsi

Görög

Török

2012

Central European Geology

View full text Add to dashboard Cite

The Oligocene clay units in the Budapest area along the new metro (subway) line show different properties than most others. They are denser and of greater strength than most of the unconsolidated ones. This paper provides an overview of their engineering geologic properties using nearly 4700 physical parameter data. These data were obtained from cores representing sampling intervals of the Kiscell Clay, on the Buda side of the Danube River. Seventeen engineering geologic parameters were used in the description of the clay. The parameter analyses show that the clay behaves as a soft rock rather than a soil.

show abstract

Geotechnical modeling at the city scale using statistical and geostatistical tools: The Pessac case (France)

Cited by 51 publications

References 17 publications

Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Investigação geoestatística para um adequado mapeamento do nível do lençol freático: o caso de Bordéus (França)

Engineering geologic evaluation of overcompacted claystone, new metro line, Budapest

Contact Info

Product

Resources

About