Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanical Behaviour of Laterally Loaded Large-Diameter Steel Tubular Piles Embedded in Soft Rock
https://orcid.org/0000-0002-6985-873X
Abstract As a part of studies on cantilever type large-diameter steel tubular pipe retaining walls embedded into stiff ground, single pile lateral loading tests were conducted as a preliminary investigation to understand the influence of embedment depth on the deformation and failure mechanism of rock socketed piles under a constant vertical eccentricity of 6.5 m. Two types of model soft rock grounds, (a) single soft rock layer (SR) and (b) soft rock layer with overlying sand (MS_SR) were made in the centrifuge model. The Influence of embedment depth on the lateral resistance of piles were investigated using three different rock socket depths in both grounds by centrifuge model tests at 50 g centrifugal acceleration. In addition, lateral resistance of piles embedded in Toyoura sand at 80% and 95% relative densities was also investigated. From the loading tests, two different failure modes of the pile foundation under lateral loading were observed, i.e., the ground failure and the structural buckling of pile depending on the embedment depth and ground strength. From the observed results, in stiff ground like soft rock, the lateral resistance changes significantly in a small range of embedment depth. A small increment of embedment depth from 1Φ to 2Φ in SR ground increased the ultimate lateral resistance by about 2.5 times and remarkably enhanced the redundancy against brittle softening and changed the deformation mechanism from brittle to the ductile one. However, the influence of increment of rock socketing from 1Φ to 2Φ in MS_SR ground becomes less significant, especially for the ultimate resistance due to the pile structural failure of all the piles. At the ultimate failure conditions, the rotational fraction dominates the pile top displacement of piles in SR ground. The fraction is about 90% when the ultimate resistance is governed by the rock failure and 65% for the structural buckling of the pile. At the ultimate failure conditions of piles in MS_SR ground about 95% of the pile top displacement is caused by the combination of rotation above the sand surface and translation at the sand surface with almost equal weights. In which, about 80% of the translation at sand surface is caused by the combination of rotation and bending of pile in the overlain sand layer, the ratio between these rotational and bending fractions under ultimate loading conditions (ML ⁓ 0.8Mult) tend to decrease from 4 times to unity, as the dR/Φ increases from 1 to 2.
Mechanical Behaviour of Laterally Loaded Large-Diameter Steel Tubular Piles Embedded in Soft Rock
https://orcid.org/0000-0002-6985-873X
Abstract As a part of studies on cantilever type large-diameter steel tubular pipe retaining walls embedded into stiff ground, single pile lateral loading tests were conducted as a preliminary investigation to understand the influence of embedment depth on the deformation and failure mechanism of rock socketed piles under a constant vertical eccentricity of 6.5 m. Two types of model soft rock grounds, (a) single soft rock layer (SR) and (b) soft rock layer with overlying sand (MS_SR) were made in the centrifuge model. The Influence of embedment depth on the lateral resistance of piles were investigated using three different rock socket depths in both grounds by centrifuge model tests at 50 g centrifugal acceleration. In addition, lateral resistance of piles embedded in Toyoura sand at 80% and 95% relative densities was also investigated. From the loading tests, two different failure modes of the pile foundation under lateral loading were observed, i.e., the ground failure and the structural buckling of pile depending on the embedment depth and ground strength. From the observed results, in stiff ground like soft rock, the lateral resistance changes significantly in a small range of embedment depth. A small increment of embedment depth from 1Φ to 2Φ in SR ground increased the ultimate lateral resistance by about 2.5 times and remarkably enhanced the redundancy against brittle softening and changed the deformation mechanism from brittle to the ductile one. However, the influence of increment of rock socketing from 1Φ to 2Φ in MS_SR ground becomes less significant, especially for the ultimate resistance due to the pile structural failure of all the piles. At the ultimate failure conditions, the rotational fraction dominates the pile top displacement of piles in SR ground. The fraction is about 90% when the ultimate resistance is governed by the rock failure and 65% for the structural buckling of the pile. At the ultimate failure conditions of piles in MS_SR ground about 95% of the pile top displacement is caused by the combination of rotation above the sand surface and translation at the sand surface with almost equal weights. In which, about 80% of the translation at sand surface is caused by the combination of rotation and bending of pile in the overlain sand layer, the ratio between these rotational and bending fractions under ultimate loading conditions (ML ⁓ 0.8Mult) tend to decrease from 4 times to unity, as the dR/Φ increases from 1 to 2.
Mechanical Behaviour of Laterally Loaded Large-Diameter Steel Tubular Piles Embedded in Soft Rock
https://orcid.org/0000-0002-6985-873X
Abstract As a part of studies on cantilever type large-diameter steel tubular pipe retaining walls embedded into stiff ground, single pile lateral loading tests were conducted as a preliminary investigation to understand the influence of embedment depth on the deformation and failure mechanism of rock socketed piles under a constant vertical eccentricity of 6.5 m. Two types of model soft rock grounds, (a) single soft rock layer (SR) and (b) soft rock layer with overlying sand (MS_SR) were made in the centrifuge model. The Influence of embedment depth on the lateral resistance of piles were investigated using three different rock socket depths in both grounds by centrifuge model tests at 50 g centrifugal acceleration. In addition, lateral resistance of piles embedded in Toyoura sand at 80% and 95% relative densities was also investigated. From the loading tests, two different failure modes of the pile foundation under lateral loading were observed, i.e., the ground failure and the structural buckling of pile depending on the embedment depth and ground strength. From the observed results, in stiff ground like soft rock, the lateral resistance changes significantly in a small range of embedment depth. A small increment of embedment depth from 1Φ to 2Φ in SR ground increased the ultimate lateral resistance by about 2.5 times and remarkably enhanced the redundancy against brittle softening and changed the deformation mechanism from brittle to the ductile one. However, the influence of increment of rock socketing from 1Φ to 2Φ in MS_SR ground becomes less significant, especially for the ultimate resistance due to the pile structural failure of all the piles. At the ultimate failure conditions, the rotational fraction dominates the pile top displacement of piles in SR ground. The fraction is about 90% when the ultimate resistance is governed by the rock failure and 65% for the structural buckling of the pile. At the ultimate failure conditions of piles in MS_SR ground about 95% of the pile top displacement is caused by the combination of rotation above the sand surface and translation at the sand surface with almost equal weights. In which, about 80% of the translation at sand surface is caused by the combination of rotation and bending of pile in the overlain sand layer, the ratio between these rotational and bending fractions under ultimate loading conditions (ML ⁓ 0.8Mult) tend to decrease from 4 times to unity, as the dR/Φ increases from 1 to 2.
Mechanical Behaviour of Laterally Loaded Large-Diameter Steel Tubular Piles Embedded in Soft Rock
Kunasegaram, Vijayakanthan (Autor:in) / Takemura, Jiro (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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