Pull-out Characteristics of Expanded Anchor Using Pulse Discharge Technology

Cha Kyung-Sub, Kim Tae-Hoon, Kim Seon-Ju

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Retaining Walls

ABSTRACT: For the anchors that the load transfer is by shear resistance mobilized along the ground-grout interface, the ground disturbance during boring is inevitable which causes a reduction of resistance. Because of that, the length of an anchor should be extended to at least weathered rock layer, which is not appropriate where the length of anchor is limited. This paper introduces PDT (Pulse Discharge Technology) anchoring method. Since this technique can make not only a bore hole expanded but also the ground improved by compaction, the anchor installed by PDT is expected to develop shaft and end bearing capacity efficiently. In order to investigate expansion characteristics, a series of experiments are conducted using a model container, whose dimensions are 1.0m in height, and 1.5m in diameter, in the laboratory. In addition, a couple of full scaled tests in order to figure out the increase of pullout capacity are performed at two different sites with loose sandy soil. As a result, the degree of expansion appears to increase up to 4 times with a decrease of relative density and an increase of the number of impulse, and the ultimate pullout capacity appears to highly increase comparing with straight shaft anchors with an increase of impulse.

RÉSUMÉ: Para los anclas que la carga se transfiere por la resistencia al esfuerzo cortante movilizado a lo largo del contacto terreno-lechada, la perturbación del terreno que reduce la resistencia durante sondeo es inevitable . Por tanto, la longitud de un ancla debe extenderse por lo menos a la capa de roca meteorizada, á donde no es apropiado limitar la longitud de un ancla. Este artículo presenta el método de PDT(Tecnología de la Descarga de Pulso) anclaje. Puesto que este método no sólo puede hacer sondeos para ser ampliados, sino también puede mejorar el terreno por la compactación, las anclas instaladas por PDT se esperan para desarrollar eficientemente la capacidad de carga admisible de cañas y puntas. Con el fin de investigar las características de la expansión, una serie de experimentos se llevan a cabo utilizando un modelo de recipiente, cuya dimensión es de 1,0 m de altura y 1,5 m de diámetro, en el laboratorio. Además, un par de pruebas en modelo de tamaño natural con el fin de determinar el aumento de la capacidad de arranque se realizó en dos sitios diferentes de suelo arenoso suelto. Como resultado, el grado de expansión aumenta hasta 4 veces a lo largo de una disminución de la densidad relativa y un incremento del impulso, y la capacidad final de extracción aumenta en alto grado en comparación con los anclas de caña recto a lo largo de un aumento del impulso.

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Cite this article:
Cha Kyung-Sub; Kim Tae-Hoon; Kim Seon-Ju (2011) Pull-out Characteristics of Expanded Anchor Using Pulse Discharge Technology in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper511,author = Cha Kyung-Sub; Kim Tae-Hoon; Kim Seon-Ju ,title = Pull-out Characteristics of Expanded Anchor Using Pulse Discharge Technology,year = 2011}