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The paper reports a case history of settlement of a piled foundation. The observed settlement is compared with that predicted by means of the superposition method developed by Poulos, based on the axial compliance of the single pile... more
The paper reports a case history of settlement of a piled foundation. The observed settlement is compared with that predicted by means of the superposition method developed by Poulos, based on the axial compliance of the single pile obtained by pile loading tests. Further evidence on the same topic, collected for a number of other structures, is presented. It is concluded that a simple linear superposition technique is surprisingly effective in predicting the amount and distribution of settlement. (A) For the covering abstract see IRRD 859983.
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In the Mediterranean area, several alluvial coastal plains, developed after the Holocene transgression, are affected by subsidence. The Volturno alluvial-coastal plain, along the eastern Tyrrhenian Sea (southern Italy) is characterized by... more
In the Mediterranean area, several alluvial coastal plains, developed after the Holocene transgression, are affected by subsidence. The Volturno alluvial-coastal plain, along the eastern Tyrrhenian Sea (southern Italy) is characterized by subsidence rates determined through InSAR data analysis and ranging between 0 and <−20 mm/year in an area of about 750 kmq across the Volturno River. Inside this area, the pattern of subsidence shows sites with apparently anomalous localized subsidence. To understand the driving mechanisms of this process, a lithostratigraphic reconstruction was provided focusing on the spatial distribution of the horizons considered weak by a geotechnical point of view; then, the subsidence map was overlain spatially with geological data in a Geographic Information System (GIS) environment. The spatial analysis highlighted the major ground deformation occurring within the outer boundary of the incised paleo-valley, corresponding to the Holocene alluvial/transit...
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The work at hand deals with the analysis and design of energy piles subjected to a cyclic temperature variation under a constant mechanical axial load. The problem is first investigated through ful...
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Instrumentation, experimental results and interpretation of loading tests on different piles in volcanic pyroclastic soils are presented and discussed
This Report of Discussion Session 1 on pile design and development and codes presents the summary of the presentations by the discussion leader and the panelists. These presentations deal respectively with Eurocode 7, pile developments,... more
This Report of Discussion Session 1 on pile design and development and codes presents the summary of the presentations by the discussion leader and the panelists. These presentations deal respectively with Eurocode 7, pile developments, effects of construction procedure of bored piles and bored piles in difficult soils and piled rafts.
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Summary The design of piles under seismic loads is conventionally carried out with reference to the inertial forces arising from structural vibrations and, hence, neglecting kinematic interaction between pile and soil. Even if in the last... more
Summary The design of piles under seismic loads is conventionally carried out with reference to the inertial forces arising from structural vibrations and, hence, neglecting kinematic interaction between pile and soil. Even if in the last years several research efforts gave particular attention to kinematic effects, they focused on bending moments at the interface between two soil layers with different stiffness, while few contributions investigated kinematic effects at pile head. The paper presents the results (both in the frequency and time domain) of extensive parametric studies, leading to a simplified formula for predicting kinematic bending moments at pile head. The paper gives some indications about their relative importance with respect to the inertial ones and provides simply rules to combine inertial and kinematic maximum effects taking into account their phase lag.
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* Ph. D, Dept. Geotech. Engrg., Univ. Napoli Federico II, Via Claudio 21, 80121 Napoli–Italy, Tel.+ 39 81 7683467, Fax+ 39 81 7683481, e-mail luca. desanctis@ unina. it** Associate Professor, Dept. Civ. Engrg., 2nd Univ. Napoli, Via Roma 29, 81031 Aversa (CE)–Italy, Tel.+ 39 81 5010214, Fax+ 39 8...more
Cette communication presente l'auscultation de la fondation de la pile centrale d'un nouveau pont sur la riviere Garigliano, dans l'Italie du Sud. On mesure la charge sur 35 des 144 pieux, la pression au contact entre le sol... more
Cette communication presente l'auscultation de la fondation de la pile centrale d'un nouveau pont sur la riviere Garigliano, dans l'Italie du Sud. On mesure la charge sur 35 des 144 pieux, la pression au contact entre le sol et la fondation en 8 points et le tassement. Une automatisation complete de l'acquisition et de l'exploitation des donnees a ete poursuivie. L'installation des capteurs de charge et de pression et quelques donnees preliminaires sont presentees dans la communication. On rapporte aussi quelques elements sur le comportement a long terme des memes instruments, installes sur d'autres sites en Angleterre depuis plus de dix ans. (A). (Voir fiche generale DIRR 128861).
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Nell'articolo vengono esposte alcune considerazioni sul rapporto relativo tra momenti di natura cinematica e inerziale per fondazioni profonde, alla luce delle prescrizioni normative italiane ed europee. Tra i risultati di maggiore... more
Nell'articolo vengono esposte alcune considerazioni sul rapporto relativo tra momenti di natura cinematica e inerziale per fondazioni profonde, alla luce delle prescrizioni normative italiane ed europee. Tra i risultati di maggiore rilevanza, viene mostrato come per terreni ...
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L'articolo indaga la risposta di pali, immersi in sottosuoli a due strati, soggetti a carichi di natura cinematica. Sulla base di risultati di analisi numeriche agli elementi finiti, viene proposta una nuova interpretazione del... more
L'articolo indaga la risposta di pali, immersi in sottosuoli a due strati, soggetti a carichi di natura cinematica. Sulla base di risultati di analisi numeriche agli elementi finiti, viene proposta una nuova interpretazione del meccanismo di flessione generato in ...
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ABSTRACT: The design of a piled foundation is generally based on capacity approach in order to ensure that the total structural load can be carried by the piles with an adequate factor of safety against bearing failure. Although this... more
ABSTRACT: The design of a piled foundation is generally based on capacity approach in order to ensure that the total structural load can be carried by the piles with an adequate factor of safety against bearing failure. Although this approach is unduly conservative, especially in those ...
ABSTRACT: The usual design of a piled raft is based on bearing capacity approach and neglects the contribution of the raft. As a consequence piled rafts are usually designed by overconservative criteria. If the raft does not provide... more
ABSTRACT: The usual design of a piled raft is based on bearing capacity approach and neglects the contribution of the raft. As a consequence piled rafts are usually designed by overconservative criteria. If the raft does not provide adequate load capacity, then the ...
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Energy piles are foundation elements having the double scope of transferring structural loads from the structure to the ground and of exchanging heat with the surrounding soil. It follows that pile state of stress and settlement are... more
Energy piles are foundation elements having the double scope of transferring structural loads from the structure to the ground and of exchanging heat with the surrounding soil. It follows that pile state of stress and settlement are altered by the time-dependent temperature change in both pile and soil. This work is aimed at investigating the effect of thermal cycles on the behaviour of a single energy pile. To this end, fully coupled thermo-hydro-mechanical analyses have been carried out using the Finite Element code ABAQUS. The single pile is installed in a normally consolidated clay behaving according to different constitutive models involving Mohr-Coulomb, Modified Cam Clay and Hypoplastic. The latter is employed with and without the thermal formulation capable of accounting for the thermal collapse of NC clays during heating. A single free-head pile is considered and the results are presented in terms of pile axial force and settlement developed cycle by cycle.
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The work at hand attempts to propose a local pile design method based on pile load test results for a reference site. Such LPDM is simply based on the identification of three dimensionless quantities, such as the capacity ratio CR, the... more
The work at hand attempts to propose a local pile design method based on pile load test results for a reference site. Such LPDM is simply based on the identification of three dimensionless quantities, such as the capacity ratio CR, the stiffness ratio SR, and the group settlement ratio Rs. To prove the LPDM reliability, experimental data collected during years in the Neapolitan area (Italy) have been used to obtain the abovementioned coefficients. Then, LPDM has been applied, as a preliminary design method, to three well-documented case histories applying capacity and settlement-based design (CBD and SBD) approaches. The satisfactory agreement between the geometry in the original design of piles and the one obtained by applying the LPDM proves that the proposed methodology may be very helpful for preliminary design, allowing for reasonable accuracy while requiring few hand calculations.
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Selected topics in the field of pile foundations are addressed. The effects of the installation technique on the bearing ca-pacity and the load-settlement response of a single pile are discussed. The latter effect is shown to be less... more
Selected topics in the field of pile foundations are addressed. The effects of the installation technique on the bearing ca-pacity and the load-settlement response of a single pile are discussed. The latter effect is shown to be less significant; a settlement controlled design is thus less dependent on the technological factors. Monitoring of the installation parameters shows some potential for controlling the pile response. The available experimental evidence on the behaviour of pile foundations under vertical loads (set-tlement, load sharing, bearing capacity), by monitoring of full scale structures or by research experiments, is reviewed. Simple em-pirical methods for a preliminary evaluation of the settlement are suggested. The (more limited) evidence about horizontal loading is also reviewed and discussed. The methods for the analysis of pile foundations under vertical load are next reported. They may be con-sidered satisfactory for engineering purposes, provided they are used ...