Deformabilidad de las arcillas expansivas bajo succión controlada

Lithological heterogeneity in sedimentary rocks and its impact on the stability of hillsides and slopesThe present work seeks to understand and comprehend the role of physical weathering by slaking in soft sedimentary rocks, which are part of a lithological heterogeneity. In many cases, slaking progresses with time and is imperceptible to the professional but when an external agent acts by overcoming the resistance of weathered material, it can generate very important stability problems.The investigation was in development at the Los Ajos mine owned by Ladrillera Santafé S.A.S, which is found localizate inside of Bogota formation. Within the mine, two slopes were selected in claystones that show the process of physical weathering by slaking; however, its development and preservation over time is different based on the external factors that interfere with it.With the aim to understand how the process of slaking evolves and comprehend its incidence in the stability of each of the slopes, monitoring was carried out on each slope by placing checkpoints on the face of each slope. At these points, deformation measurements were made on during expansion and contraction cycles on the slope face and in furrows with great progress to understanding the slaking process. In addition, geomechanical and mineralogical characterization of the degraded claystone and slightly weathered claystone were carried out.Based on the geomechanical characterization and mineralogical composition of the claystone of each slope, thicknesses of material affected by the slaking process were established and the following parameters were proposed: slaking intensity for Slope 1 and erosion-transport-deposition rates for Slope 2.

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“…Pousada Presa (1982), resume los numerosos mecanismos de expansión que han sido descritos en la literatura:…”

Section: Mecanismos De Expansiónunclassified

Influence of Water Content on the Mechanical Properties of an Argillaceous Swelling Rock

Vergara

Triantafyllidis

2016

Rock Mech Rock Eng

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“…Ejemplos de este tipo de comportamientos fueron presentados por varios autores. (Pousadas, 1984;Alonso et al,1995;Wheeler et al, 2003) F igura 2.58 Ciclos de humedecimiento y secado sobre un Caolín compactado bajo carga isót ropa. (Ensayo s realiz ados por Buisson, publicados en W heeler et al 2003)…”

Section: Comportamiento Volumétricounclassified

Modelo constitutivo basado en la teoría de la plasticidad generalizada con la incorporación de parámetros de estado para arenas saturadas y no saturadas

Manzanal¹

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“…Figura 6.16. Deformaciones propias del edómetro con succión matricial (Pousada Presa, 1982). Figura 6.17.…”

Section: Lista De Figurasunclassified

“…Como quiera que, además, el Laboratorio de Geotecnia del CEDEX poseía cierta experiencia en el desarrollo de equipos para estudiar suelos no saturados (Escario, 1965, 67, 69, 80, 88, 89;Escario y Sáez, 1973, 86, 87;Pousada Presa, 1982;Esteban, 1988;Jucá, 1990), se planteó abrir una nueva línea de investigación propia del Laboratorio de Geotecnia, consistente en el desarrollo de equipos de fácil manejo para la medida de la fricción entre ambos materiales, dotándolos de sistemas de control de la succión.…”

Section: Antecedentes De La Investigaciónunclassified

“…Finalmente, se decidió el empleo de la arcilla conocida en Madrid como "peñuela", de color gris-verdoso, muy preconsolidada, expansiva en grados variables y elevada succión inicial. De hecho, ya existían investigaciones con este suelo relativas al comportamiento en condiciones no saturadas que evidencian rasgos del comportamiento buscado (Pousada Presa, 1982;Jucá, 1990). Otro motivo de conveniencia era que, como se describe en el Apartado 3.5, la resistencia al corte con control de la succión de la "peñuela" ha sido estudiada con detalle (Escario, 1980;Escario y Sáez, 1986;Escario y Jucá, 1989;Escario, 1989;Jucá, 1990).…”

Section: Criterios De Selecciónunclassified

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Determinación de las características de fricción en el contacto suelo-geotextil a diferentes succiones, mediante equipos de laboratorio singulares

Izquierdo¹

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This research comprises the design, adjustment and setting up two novel laboratory apparatuses, which provide the measurement of the mobilized friction at the interface between a soil and a geotextile, both subjected to unsaturated conditions. Even though some features of the mechanical layout of both devices and Casagrande´s shear box are much alike (in this case, the size of the boxes is 60 x 60 mm), the original feature is that the samples are tested under unsaturated controlled conditions, i. e., with control of water content, by means of the techniques for unsaturated soils. These techniques have been successfully adapted for equipment for testing both deformation and shear strength. However, hardly no references have been found in connection with soil-geosynthetic interaction.One of the friction apparatuses has been devised to be suitable for the "vapour pressure control" technique. The suction is controlled by the relative humidity within the cell atmosphere, that in turn, is governed by the concentration of a water solution.This procedure allows the control of total suction, being accurate, though, only for values higher than 2 MPa.The other apparatus has been devised to be suitable for the "axis translation technique", in particular, when using a cellulose membrane, which allows only water to flow through. It essentially consists of applying suction indirectly, by raising air pressure and keeping water at atmospheric pressure. Even though this technique do not generate the actual state of an unsaturated soil, it has been widely verified. In addition, this technique has become very valuable, as it allows a proper control of suction in most of the range of geotechnical practice (between 0 to 10 MPa), despite it is only capable of controlling matric suction.The tests program was carried out with remoulded samples of an expansive clay (locally known as "peñuela") with 7% of sodium montmorillonite, yielding LL=74 %, PI=37%, free swelling of 14 %, swelling pressure of 0,31 MPa and initial suction of 1,9 MPa. The friction tests comprised this soil and 3 different non-woven III needle-punched PP geotextiles. One of them is reinforced by PET yarns. Tests subjected to total suctions ranged between 2 and 20 MPa, and those subjected to matric suctions, between 5 kPa and 1 MPa. In addition, an insight of the "capillary break" effect caused by geotextiles embedded in the soil mass is included and the characteristic curves of the geotextiles have been obtained. Lastly, as a result of this research, the determination of the interface efficiency becomes suction-dependent. IV AGRADECIMIENTOSEsta investigación se inició en 1999 con motivo de un convenio de investigación

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Deformabilidad de las arcillas expansivas bajo succión controlada

Cited by 13 publications

References 19 publications

Influence of Water Content on the Mechanical Properties of an Argillaceous Swelling Rock

Influence of Water Content on the Mechanical Properties of an Argillaceous Swelling Rock

Modelo constitutivo basado en la teoría de la plasticidad generalizada con la incorporación de parámetros de estado para arenas saturadas y no saturadas

Determinación de las características de fricción en el contacto suelo-geotextil a diferentes succiones, mediante equipos de laboratorio singulares

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