Valuation of Ground Penetrating Radar for the record of structures in fluvio lacustrine soils

Rangel, Domingo; Carreón, Dora; Cerca, Mariano; Méndez, E.

doi:10.22201/icat.16656423.2003.1.01.618

Cited by 3 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The GPR method has been shown to be a useful tool for characterization of lacustrine and volcanic sediments because of its sensitivity to water content, grain‐size and variations in compaction (Freeland et al ; Carreón‐Freyre et al ; Rangel et al ; Neal ). Detailed stratigraphic sections of 10 m length and up to 7.0 m depth were made in two excavations perpendicular and crossing the main trace of the FC (see Fig.…”

Section: Methodology For the Analysis Of Fracturing Using Ground‐penementioning

confidence: 99%

Delineating the near‐surface geometry of the fracture system affecting the Valley of Querétaro, Mexico: Correlation of GPR signatures and physical properties of sediments

Carreón‐Freyre

Cerca

2005

Near Surface Geophysics

View full text Add to dashboard Cite

We present a combined ground-penetrating radar (GPR) and geotechnical investigation of a faultfracture system that affects the Valley of Querétaro. The main fracture, known as Falla Central (FC), is aligned with N-S-orientated regional faults suggesting that the buried fault scarps influence the geometry and propagation of fractures. Although the origin of fracturing is closely related to geological factors, in the urbanized area of Querétaro the mechanical and hydraulic equilibrium in the subsoil is also perturbed by anthropogenic activities, such as overexploitation of groundwater and overloading of compressible ground. In order to delineate the fracturing geometry, we obtained several vertical GPR profiles, perpendicular and oblique to the main trace of the fracture, with two different prospecting frequencies, 900 and 300 MHz. Processing of radar profiles consisted of background removal, topographic correction and AGC amplitude correction to enhance stratigraphicrelated records. The near-surface stratigraphy consists of partially saturated fluvio-lacustrine granular and pyroclastic deposits. Detailed measurements of specific gravity, grain-size, plasticity, water content, and electrical conductivity were performed on samples collected from two shallow trenches in order to relate physical changes in the sedimentary sequence to the recorded electrical contrasts. The analysis of the GPR profiles, plus the stratigraphic record, enabled us to identify variations in the deformation of layers, and changes in direction, width and vertical displacement of fractures. Our results suggest that the propagation of the fracture is influenced by the conditions of deposition of the geological materials and by the anthropogenic activity. al. 2002;Carreón-Freyre et al. 2005) and overloading of highly compressible ground. The rapid development of the urban infrastructure in the Valley of Querétaro has caused an increase in the demand for groundwater. Furthermore, the problem is increased because the near-surface clay-bearing sediments of this valley fracture easily when dry, and the lateral variations of the geological properties of sediments can influence the distribution and behaviour of the near-surface fractures that affect urban areas. The aim of this paper is to provide a non-destructive identification of the structure of volcanic-lacustrine sediments in order to correlate physical properties with changes in the fracture geometry. Detailed determinations of physical properties, i.e. water content, electrical conductivity, grain-size, and variation of compaction with depth, performed in two trenches excavated perpendicular to the trace of the fractures, allowed a correlation between the electromagnetic response and the physical-mechanical properties of clayey-sandy lacustrine deposits. * freyre@geociencias.unam.mx

show abstract

Section: Methodology For the Analysis Of Fracturing Using Ground‐penementioning

confidence: 99%

Delineating the near‐surface geometry of the fracture system affecting the Valley of Querétaro, Mexico: Correlation of GPR signatures and physical properties of sediments

Carreón‐Freyre

Cerca

2005

Near Surface Geophysics

View full text Add to dashboard Cite

show abstract

A GPR study of subsidence-creep-fault processes in Morelia, Michoacán, Mexico

Ávila-Olivera

Monroy

2008

Engineering Geology

View full text Add to dashboard Cite

Microtremor measurements to identify zones of potential fissuring in the basin of Mexico

Ovando-Shelley

2022

GeoInt

View full text Add to dashboard Cite

El potencial para Ia aparición de grietas y fisuras en Ia Cuenca de Mexico puede inferirse a partir de Ia medición de microtremores. Una gran parte de las grietas de Ia cuenca han aparecido en zonas donde el espesor de los suelos blandos compresibles cambia bruscamente. Se sabe que el periodo dominante de sitio depende del espesor del suelo compresible, H, a través de Ia relación elástica T0=4H/Vs, en donde Vs es Ia velocidad media de ondas de corte. Si se supone que Vs es aproximadamente constante dentro de un área dada, el gradiente del periodo T0 reflejara el gradiente del espesor. Así, si se mide T0 será posible relacionarlo con el potencial de agrietamiento en Ia cuenca. La técnica de Nakamura provee una manera simple, rápida y económica de estimar T0, al menos en Ia zona del lago. En este trabajo se valida esta premisa a partir de lo observado en San Lorenzo Ixtapalapa donde se han registrado agrietamientos y en donde también se ha podido estimar H a partir de información geotécnica.doi: sin doi

show abstract

Valuation of Ground Penetrating Radar for the record of structures in fluvio lacustrine soils

Cited by 3 publications

References 8 publications

Delineating the near‐surface geometry of the fracture system affecting the Valley of Querétaro, Mexico: Correlation of GPR signatures and physical properties of sediments

Delineating the near‐surface geometry of the fracture system affecting the Valley of Querétaro, Mexico: Correlation of GPR signatures and physical properties of sediments

A GPR study of subsidence-creep-fault processes in Morelia, Michoacán, Mexico

Microtremor measurements to identify zones of potential fissuring in the basin of Mexico

Contact Info

Product

Resources

About