Published

2019-01-01

Assessment of groundwater level variations using multivariate statistical methods

Evaluación de cambios en el nivel freático mediante métodos estadísticos multivariados

Keywords:

Analysis of repeated measures profiles, boreholes, infrastructure projects, Metro of Bogotá city (en)
Análisis de perfiles de medidas repetidas, Metro de la ciudad de Bogotá, proyectos de infraestructura, sondeos (es)

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Fluctuation of groundwater level induces changes in pore-water pressure of soil. However, this variation is not considered for underground constructions. This article explores the application of a statistical method to evaluate the groundwater level variation in geotechnical designs. The methodology included: (i) data collection, (ii) statistic formulation, and (iii) statistic data analysis. We collected information from the technical studies of the project “Metro de Bogotá”, and selected four boreholes spanning 160 m, approximately, where the 1° de Mayo metro station will be built, in the south of the city. We used groundwater level readings reported by different piezometers for 30 days and data variance was assessed using a multivariate statistical method: analysis of repeated measures profiles. Results present a procedure to estimate the groundwater level fluctuation during a short monitoring period. We concluded that the analysis of repeated measures profiles allows estimating the groundwater level variation under a significance level 1-a. 

La fluctuación del nivel freático induce cambios en la presión de poros del suelo. Sin embargo, esta variación no se contempla en construcciones subterráneas. Este documento explora la aplicación de un método estadístico para evaluar la variación del nivel freático en diseños geotécnicos. La metodología incluyó: (i) recolección de datos, (ii) formulación estadística y (iii) análisis estadístico de datos. Se recopiló información de los estudios técnicos del proyecto "Metro de Bogotá". Se seleccionaron cuatro sondeos que abarcan 160 m, aproximadamente, donde se construirá la estación 1° de Mayo, al sur de la ciudad. Se utilizaron lecturas de nivel freático reportadas por varios piezómetros, durante 30 días y la variabilidad de los datos se evaluó utilizando el método estadístico multivariado: análisis de perfiles de medidas repetidas. Los resultados presentan un procedimiento para estimar la fluctuación del nivel freático durante un período corto de monitoreo. Se concluyó que el análisis de perfiles de medidas repetidas permite estimar la variación del nivel freático bajo un nivel de significancia 1-a.

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