A Study of Pile-Soil Interaction Behavior Under Static, Cyclic and Dynamic Lateral Loadings

1984 ◽  
Vol 106 (4) ◽  
pp. 496-501
Author(s):  
M. Gao ◽  
D. B. Chin ◽  
M. Y. Ma ◽  
R. G. Sun
Keyword(s):  
Soft Clay ◽  
Triaxial Tests ◽  
Silty Clay ◽  
The Finite Element Method ◽  
In Situ Experiment ◽  
Soil Stiffness ◽  
Interaction Behavior ◽  
Dynamic Loadings ◽  
Steel Pipe Pile

In this paper, the pile-soil interaction behavior of a large-sized steel pipe pile in soft silty clay along the downstream of the Yangtze River is analyzed and discussed through an in-situ experiment under lateral static, cyclic and dynamic loadings, along with the static and dynamic triaxial tests on soil samples in laboratory. In the analysis, the finite element method and other simplified methods are compared using different models of lateral soil stiffness. From the results of the tests as well as the analysis, a possible formulation of the p-y curves of the pile in soft clay under lateral loadings is suggested, and a simplified method of dynamic analysis taking into account of the pile-soil interaction is also proposed.

Permeability evaluation and its implications for consolidation analysis of an Italian soft clay deposit

2001 ◽  
Vol 38 (6) ◽  
pp. 1166-1176 ◽  
Author(s):  
Giampaolo Cortellazzo ◽  
Paolo Simonini
Keyword(s):  
Finite Element ◽  
Soft Clay ◽  
Silty Clay ◽  
The Finite Element Method ◽  
Consolidation Process ◽  
Permeability Characteristics ◽  
Clay Deposit ◽  
Consolidation Rate ◽  
Permeability Evaluation

The present research concerns a comparative analysis of the possible methods for estimating soft silty clay permeability to be used in the analysis of consolidation. For this purpose the consolidation response of a thick and homogeneous, instrumented soft silty clay deposit, on which an embankment was constructed, is back-analyzed using the finite-element method. To model the consolidation process, permeability data are carefully determined both from laboratory and in situ piezocone tests. One-dimensional and triaxial permeability test data are compared with the results of piezocone dissipation tests, the latter interpreted using four different solutions. The effects of anisotropy on permeability characteristics influencing the consolidation rate are also discussed.Key words: consolidation, embankment, finite-element analyses, permeability, piezocone, soft silty clay.

Analysis of a sanitary-embankment failure over the Rio de Janeiro soft clay deposit

1991 ◽  
Vol 28 (1) ◽  
pp. 92-102 ◽  
Author(s):  
Renato Pinto Da Cunha ◽  
Willy Alvarenga Lacerda
Keyword(s):  
Rio De Janeiro ◽  
Soft Clay ◽  
Triaxial Tests ◽  
Guanabara Bay ◽  
Total Stress ◽  
Clay Deposit ◽  
Geotechnical Characteristics ◽  
Penetration Tests ◽  
Oedometer Tests

This paper presents the analysis of an embankment failure over a soft clay deposit in the district of Caju, Rio de Janeiro. The uncommon feature of the analysis is related to the embankment's material, which is mainly composed of dumped sanitary and rubble fill, and the unconsolidated state of the subjacent clay layer. Index tests were performed to obtain geotechnical characteristics and a profile of the soft clay deposit, which were compared with a well-known Brazilian clay from the same area (Guanabara Bay). Oedometer tests, in situ and laboratory vane tests, standard penetration tests, and conventional triaxial tests were also carried out. Total stress calculations were used to interpret and back analyze the failure and also to obtain the mobilized shear strength at both the fill and clay foundation. It was concluded that for an embankment cohesion of 0–20 kPa, the ratio between the back-analyzed Cu and the in situ postfailure Cu has a magnitude similar to the soft clay sensitivity. Key words: case history, sanitary fill, soft clay.

scholarly journals From small wrinkles to Schallamach waves during rubber friction: In situ experiment and 3D simulation

2021 ◽  
Vol 96 ◽  
pp. 107084
Author(s):  
Cui Zhibo ◽  
Su Zhaoqian ◽  
Hou Dandan ◽  
Li Genzong ◽  
Wu Jian ◽  
...  
Keyword(s):  
3D Simulation ◽  
In Situ Experiment ◽  
Rubber Friction

scholarly journals In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6531 ◽  
Author(s):  
Zongxing Zou ◽  
Qi Zhang ◽  
Chengren Xiong ◽  
Huiming Tang ◽  
Lei Fan ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Plastic Deformation ◽  
Shear Test ◽  
Slip Zone ◽  
Three Gorges Reservoir Area ◽  
Silty Clay ◽  
Sigmoid Function ◽  
In Situ Test ◽  
Deformation Stage

Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. The test results show that the shear deformation process of the gravelly slip zone soil includes an elastic deformation stage, elastic–plastic deformation stage, and plastic deformation stage. Four functions were introduced to express the shear constitutive model of the gravelly slip zone soil, and the asymmetric sigmoid function was demonstrated to be the optimum one to describe the relationship of the shear stress and shear displacement with a correlation coefficient of 0.986. The comparison between the in situ test and indoor direct shear test indicates that gravels increase the strength of the slip zone soil. Therefore, the shear strength parameters of the gravelly slip zone soil obtained by the in situ test are more preferable for evaluating the stability of the landslide and designing the anti-slide structures.

Effects of Stress Path and Stress History on the Stiffness of Reconstituted London Clay

1986 ◽  
Vol 2 (1) ◽  
pp. 139-144 ◽  
Author(s):  
J. H. Atkinson ◽  
J. S. Evans ◽  
D. Richardson
Keyword(s):  
Stress Path ◽  
Triaxial Tests ◽  
Soil Parameters ◽  
Stress History ◽  
Strain Behaviour ◽  
Reconstituted Soil ◽  
Path Dependent ◽  
London Clay ◽  
Soil Behaviour

AbstractSoil behaviour is stress history dependent and stress path dependent and soil parameters, particularly those for stress-strain behaviour, measured in conventional triaxial tests may not represent the behaviour of soil in many civil engineering works.To obtain more realistic parameters it may be necessary to conduct laboratory tests which more closely represent in situ conditions before and during construction.The paper describes equipment developed at The City University to carry out stress path tests simply and economically. A series of CU triaxial tests and stress path tests on reconstituted soil illustrate the dependence of measured soil parameters on stress history and stress path.

Evaluation on Features of Soft Foundation Engineering and Bearing Layer of Pile in Jiaxing City

2011 ◽  
Vol 90-93 ◽  
pp. 217-221
Author(s):  
Jin Long Zhou ◽  
Qiao Li ◽  
Wei Zhong Cai
Keyword(s):  
Soil Mass ◽  
Shallow Foundation ◽  
Silty Clay ◽  
Foundation Engineering ◽  
Foundation Soil ◽  
Cone Tip Resistance ◽  
Soft Foundation ◽  
Tip Resistance ◽  
Bearing Layer

Through the investigation into composition of major shallow foundation soil mass and the correlation of mechanical indicators in this study, the regression equation of mechanical indicators of the features of local foundation soil mass and the data of in situ testing was obtained. Based on massive quantities of exploration materials, this study analyzed engineering features, distribution status, and the feasibility of silty clay to be used as the bearing layer of the pile in Layer ④2 . The analytical results showed that the silty clay with the uniform depth of over 3.5m and the cone tip resistance in static sounding of over 400MPa could be used as bearing layer of the pile. This study could provide the reference for the accurate understanding of the engineering features of soil mass, and the design and evaluation of foundation in Jiaxing City.

An in situ experiment on temperature sensitivity of near-shore benthic foraminifera

1996 ◽  
Vol 26 (1) ◽  
pp. 53-63 ◽  
Author(s):  
C. T. Schafer ◽  
F. E. Cole ◽  
D. Frobel ◽  
N. Rice ◽  
M. A. Buzas
Keyword(s):  
Temperature Sensitivity ◽  
Benthic Foraminifera ◽  
In Situ Experiment ◽  
Near Shore
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