Side resistance rock sockets in sandstone, mudstone, and shale

Williams, A F; Pells, P.J.N.

doi:10.1139/t81-061

Cited by 109 publications

(52 citation statements)

References 14 publications

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“…The performance of rock-socketed piles at service loads is dependent predominantly on the shear stress developing at the interface between the concrete pile and the surrounding rock. Both practical experience and laboratory experiments have confirmed that sidewall roughness has a significant impact on the bearing capacity of rock-socketed piles [10,12,14,20,24,33,36,45].…”

Section: Introductionmentioning

confidence: 87%

The effect of sidewall roughness on the shaft resistance of rock-socketed piles

et al. 2016

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Piles socketed into rock are increasingly used to support loads from large-span bridges and heavy buildings. Peak side resistance is typically related to unconfined compressive strength, sidewall roughness and rock mass quality. This paper presents the results of tests on piles socketed in a weak, artificial rock made of sand, cement, gypsum powder and water. The test results are compared with methods of estimation in which the roughness of the pile-rock interface is modeled explicitly by assuming sinusoidal undulations along the interface. The testing program includes 10 model piles. Some of these piles have nonzero base resistance; others are unsupported at the base. The results indicate that both the degree of roughness of the socket sidewall and the base stiffness are of major importance to the load response of rock-socketed piles. The ultimate unit side resistance was observed to increase substantially with both increasing sidewall roughness and increasing base stiffness, but there is an upper limit to socket roughness beyond which very little increase in side resistance can be obtained. Most of the available correlations used to predict the ultimate side resistance of rocksocketed piles produced conservative estimates for the test piles in this study.

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Section: Introductionmentioning

confidence: 87%

The effect of sidewall roughness on the shaft resistance of rock-socketed piles

et al. 2016

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“…Examples of these are found at the interface between the base of a dam or cast in situ pile rock sockets (Horvath, 1978;Rosenberg and Journeaux, 1976;Williams and Pells, 1981) and rock-steel interfaces such as rock bolts (Li and Håkansson, 1999) or H-steel piles driven into rock (Yu et al, 2013). These rock-steel interface examples result in constant normal stiffness (CNS) conditions, which lead to high normal stresses where the interface is subject to shear and constraint of dilation.…”

Section: Introductionmentioning

confidence: 99%

Chalk–steel interface testing for marine energy foundations

Ziogos

Brown

Ivanović

et al. 2017

Proceedings of the Institution of Civil Engineers - Geotechnica

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2 3 4To aid deployment and recovery of tidal stream generators, gravity-based foundations rather than fixed-foundation alternatives are being considered in areas where the foundation may be placed directly onto an exposed rock seabed.Horizontal loading is usually critical in such applications, therefore specific knowledge of the interface friction between the foundation (made of steel or concrete) and seabed is important for design. This paper presents results of an interface testing programme of chalk-steel interfaces carried out utilising a computer-controlled interface shear tester under constant normal stress conditions against steel of different roughness. Results indicate that interface strength is significantly affected by the normal stress applied, as interface strength degrades for normal stress levels in excess of 30% of the chalk's tensile strength ($300 kPa). Large-displacement tests revealed a tendency of the ultimate interface frictional resistance to drop to values very similar to that of the basic chalk-chalk interface at normal stresses up to 300 kPa, whereas substantial additional degradation was noticed for normal stresses above 700 kPa. At low normal stresses and displacements the behaviour of the chalk-steel interface was captured by an alpha type approach related to the rock unconfined compressive strength, which has been developed for other higher strength rock types.

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“…The models require numerical accuracy for parameters that are not typically evaluated in engineering. It is common to use parameters, such as rock cohesion (c), angle of friction (j) and uniaxial compressive strength (q u ), that are generated through Equation 1 and Table 1 (Horvath et al, 1980;Williams & Pells, 1981;Amir, 1986;Rowe & Armitage, 1987;Kulhawy & Phoon, 1993).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of foundation pilings partially embedded in rock

Garcia

Albuquerque

Melo

2013

Rem: Rev. Esc. Minas

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ResumoAnalisa-se o comportamento de quatro estacas-raiz (f=0,41m) executadas na cidade de Foz do Iguaçu/PR, as quais foram submetidas a provas de carga com carregamento lento. Os resultados foram confrontados com aqueles obtidos por meio de modelagem numérica tridimensional pelo método dos elementos finitos, o qual permite simular o comportamento elásto-plástico do solo. O subsolo local apresenta variada estratigrafia, composto por uma camada superficial de solo residual, seguida por alteração de rocha e rocha sã em poucos metros de profundidade. Os parâmetros geotécnicos do maciço foram determinados por meio de correlações obtidas a partir de ensaios de campo, estimando-se os valores de coesão, ângulo de atrito, módulo de deformabilidade e resistência à compressão uniaxial das diferentes camadas do subsolo. As provas de cargas foram interrompidas quando alcançaram 3000 kN, apresentando deslocamentos inferiores a 5mm na carga de trabalho (1500 kN). Verificou-se que as estacas trabalharam por atrito lateral com tensões médias da ordem de 70 kPa, para o trecho superficial (solo residual), e superiores a 150 kPa, nos trechos em alteração de rocha. Os parâmetros geotécnicos estimados forneceram valores que se adequaram perfeitamente às análises numéricas. Nesse sentido, pôde-se verificar, através das análises realizadas e pelo modelo de transferência de carga, que seus comprimentos poderiam ser reduzidos, possibilitando otimizar o projeto geotécnico.Palavras-chave: Estaca-raiz, embutimento em rocha, prova de carga, análise numérica tridimensional. Abstract

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Side resistance rock sockets in sandstone, mudstone, and shale

Cited by 109 publications

References 14 publications

The effect of sidewall roughness on the shaft resistance of rock-socketed piles

The effect of sidewall roughness on the shaft resistance of rock-socketed piles

Chalk–steel interface testing for marine energy foundations

Experimental and numerical analysis of foundation pilings partially embedded in rock

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