Experimental Study of Compressive Bearing Capacity of Pile-Bucket Foundation

2011 ◽  
Vol 261-263 ◽  
pp. 1851-1855
Author(s):  
Wen Bai Liu ◽  
Ye Li ◽  
Da Shan Wang
Keyword(s):  
Bearing Capacity ◽  
Soil Surface ◽  
Shallow Foundation ◽  
Length Variation ◽  
Obvious Effect ◽  
Foundation Soil ◽  
Bucket Foundation ◽  
Circular Shape ◽  
Pile Length ◽  
Surrounding Soil

By combining indoor model experiment and numerical simulation, the analysis of pile-bucket foundation bearing capacity under pressure load was conducted, and the bearing capacity can be enhanced by enlarging the three main dimensions of pile-bucket foundation: diameter of bucket, height of bucket and length of pile. By enlarging the diameter of bucket by 1.5 times while maintaining the two other dimensions, the bearing capacity can be enhanced by 140%;the bearing capacity can be enhanced by 15% when the height of bucket is enlarged by 2 times; the bearing capacity can be enhanced by 14% when the pile length is enlarged by 30% ,that means the variation of bucket diameter affects the pile-bucket foundation bearing capacity most, apart from that the variation of bucket diameter also holds the most obvious effect on the ground foundation soil body in crosswise scope, the bucket diameter of 3# pile-bucket was 1.5 times that of 1# pile-bucket, after the surrounding soil broke, the influence scope on crosswise soil surface was enhanced by the size 3.8 times breadth of bucket diameter; and the pile-length variation keeps the largest effect on surrounding soil body in-depth, the depth of effect on grounding soil of 1#pile-bucket is enlarged by 925mm comparing by 2#pile-bucket (approximately 9 times of bucket diameter) ; By conducting indoor-model pressure bearing capacity experiment on pile –bucket foundation,bucket foundation and circular-shape shallow foundation with same diameter, the limiting bearing capacity of pile-bucket foundation is 3.2 times that of circular-shape shallow foundation and 1.26 times that of bucket foundation, a manifestation of the bearing capacity advantage of pile-bucket foundation.

Study on Effects of the Scouring on Horizontal Bearing Capacity of the Composite Bucket Foundation

2018 ◽  
Author(s):  
Ding Hongyan ◽  
Zhao Xing ◽  
Zhang Puyang ◽  
Le Conghuan
Keyword(s):  
Bearing Capacity ◽  
Model Test ◽  
Shallow Foundation ◽  
Offshore Wind ◽  
Physical Model Test ◽  
3D Fem ◽  
Foundation Soil ◽  
Bucket Foundation ◽  
Loading Mode ◽  
Waves And Currents

Composite bucket foundation is a new kind of wide-shallow foundation for offshore wind turbines, and can be made on land, transported and installed by one step. Compared with other deep pile foundations, the erosion caused by waves and currents is more obvious and this would cause more risks for the overall safety of the wind turbine. In order to know more about it, a 3D FEM composite bucket foundation - soil model is established using Abaqus in this paper. In this study, the lateral bearing capacity of composite bucket foundation in different situation is analyzed by FEM and the results of FEM have been compared with that of physical model test. And through anther model test, the size parameters of scouring pit are obtained. Then the emergence and development of scouring pits are simulated by continuously excavating soil. The horizontal bearing capacity of a practical project is calculated considering the influence of scouring on the CBF by the displacement loading mode. The calculation results show that the horizontal bearing capacity of the bucket foundation is significantly reduced after scouring, and the influence of scour depth is more significant than the scouring extent.

scholarly journals INVESTIGATION OF SHALLOW FOUNDATION SOIL BEARING CAPACITY AND SETTLEMENT CHARACTERISTICS OF MINNA CITY CENTRE DEVELOPMENT SITE USING PLAXIS 2D SOFTWARE AND EMPIRICAL FORMULATIONS

2017 ◽  
Vol 36 (3) ◽  
pp. 663-670
Author(s):  
AB Salahudeen ◽  
JA Sadeeq
Keyword(s):  
Soil Properties ◽  
Bearing Capacity ◽  
Average Energy ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Analytical Models ◽  
City Centre ◽  
Foundation Soil ◽  
Development Site ◽  
Allowable Bearing Pressure

This study investigated the soil bearing capacity and foundation settlement characteristics of Minna City Centre development site using standard penetration test (SPT) data obtained from10 SPT boreholes at 0.6, 2.1 and 3.6 m depths to correlate soil properties. Evaluation of foundation bearing capacity and settlement characteristics for geotechnical preliminary design of foundations was carried out using some conventional empirical/analytical models and numerical modelling. The aim was to investigate and determine the geotechnical parameters required for adequate design of Physical structures of the proposed Minna City Centre, at Minna the capital of Niger state. The SPT N-values were corrected to the standard average energy of 60% (N60) before the soil properties were evaluated. Using the corrected N-values, allowable bearing pressure and elastic settlement of shallow foundations were predicted at 50 kN/m2 applied foundation pressure. The numerical analysis results using Plaxis 2D, a finite element code, shows the analytical/empirical methods of estimating the allowable bearing pressure and settlements of shallow foundations that provided acceptable results. Results obtained show that an average bearing capacity value of 100 – 250 kN/m2 can be used for shallow foundations with embedment of 0.6 to 3.6 m on the site.  http://dx.doi.org/10.4314/njt.v36i3.1

Discussion on the Bearing Capacity Determination Methods of Shallow Foundation in Shanghai Region

2013 ◽  
Vol 339 ◽  
pp. 623-627
Author(s):  
De Fang Chen
Keyword(s):  
Bearing Capacity ◽  
Mechanical Tests ◽  
Shallow Foundation ◽  
Test Results ◽  
Foundation Soil ◽  
Capacity Calculation ◽  
Determination Methods ◽  
Preliminary Study ◽  
Inversion Analysis

Representative engineering geological data of Shanghai were collected in this article for analyzes differences between shallow land basic bearing capacity of soil between test values and situ test values. Microstructure of soil geographical is analysis by conventional physical and mechanical tests laboratory. Collect on-site load plate test results of Shanghai shallow foundation soil, and take inversion analysis of the carrying capacity and regression analysis to calculate the bearing capacity of foundation soil test values and in situ values rationality, do a preliminary study on the current bearing capacity calculation and selection.

scholarly journals Engineering Subsoil Characterization for Shallow Foundation Design in Ode Irele Area of Ondo State, Southwestern Nigeria

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Olumuyiwa O. Falowo ◽  
Michael B. Amodu
Keyword(s):  
Bearing Capacity ◽  
Shallow Foundation ◽  
Soil Conditions ◽  
Cone Penetration ◽  
Foundation Design ◽  
Southwestern Nigeria ◽  
Foundation Soil ◽  
Geotechnical Investigations ◽  
Allowable Bearing Capacity ◽  
Coastal Sand

Integrated geophysical and geotechnical investigations for foundation design have proved to be good veritable tools in effective foundation design and construction. Geophysical and geotechnical methods involving electrical resistivity and cone penetration test have been carried out to investigate the foundation soil conditions of Ode Irele, southwestern Nigeria. Six vertical electrical sounding (VES) were carried out along two traverses; which is complemented by two cone penetration tests with seven trial tests at different subsurface depths. The geotechnical results showed that the soils are sand and silt dominated. All the tested parameters fall within the Nigeria federal ministry of works and housing specification with liquid limit (< 50%), plastic limit (< 30%), plasticity index (< 20%). The geoelectric sections identified maximum of six geoelectric/geologic subsurface layers comprising the topsoil (red sand), weathered layer (made up of coastal sand/white sand), clayey sand (which is the major aquitard in the area), intermediate sand aquifer unit. However the coastal sand layer has moderately high resistivity at shallow depth to sustain foundation load with thickness greater than 2 m. The groundwater level measured from existing borehole records 17.5 m which may not or seriously affect the bases of the foundation footing. Consequently an average allowable bearing capacity of 150 KN/m2 (ultimate bearing capacity of 450 KN/m2) would be appropriate for design of shallow foundation in the area, at a depth not less than 1.6 m in Ode Irele and 0.8 m at Ajagba. The foundation width of 0.6 m would produce minimum bearing settlement less than 25 mm. The appropriate (recommended) ultimate bearing and allowable bearing capacity for strip and square footings at depth levels of 0.6 – 1.2 m vary from 1486 – 1842 KN/m2 and 495 - 614 KN/m2; and 2056 – 2489 KN/m2 and 685 - 830 KN/m2 respectively.

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.

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