Science topic

Pile Group - Science topic

Explore the latest publications in Pile Group, and find Pile Group experts.
Filters
All publications are displayed by default. Use this filter to view only publications with full-texts.
Publications related to Pile Group (3,042)
Sorted by most recent
Article
Full-text available
Engineering geological conditions in our country are complex and diverse. Many high-rise buildings, bridges, and launch towers are inevitably built on high and steep slopes. Heavy rain, earthquake, human engineering activities, and other factors lead to frequent landslides, soil creep deformation, and overall sliding, resulting in a certain bending...
Article
Full-text available
A system known as pedestrian recognition makes use of several cameras to identify the surrounding area and quickly identify and match the target demographic. Based on pedestrian recognition, the picture model, pedestrian features, and other information, the features are developed to have a high degree of generalizability, distinctiveness, and accur...
Article
Full-text available
Tunnels and foundation pits are two separate types of excavation that are frequently used in urban settings. Excavating tunnels and foundation pits sequentially around existing pile foundations is becoming more and more prevalent as urban underground space utilization rates increase. The deformation and load transfer mechanisms of the pile group fo...
Article
Full-text available
Pile groups are traditionally designed with similar piles in length, diameter, and property. However dissimilar piles may occur in the cases of foundation reuse and economical building design. This paper develops a fictitious pile method for the interaction factors between two dissimilar piles in a pile group that have different dimensions and prop...
Article
Full-text available
In deep foundations, the pile group and the pile raft are generally used. To date, the contribution of the raft is not taken into account in the design, even when the raft is in contact with the soil and the whole system is therefore considered to work as a pile group foundation. In a combined pile raft system, the raft takes a considerable portion...
Article
Full-text available
Negative skin friction on piles represents a severe problem when piles were installed in soft clay due to consolidation process. It reduces the bearing capacity of piles by adding additional load due to drag load developed on piles. Additional settlement due to negative skin friction might produce threatening consequences such as differential settl...
Article
Full-text available
The electrical resistivity method has been successfully used to detect shallow buried foundations, almost, by using 2D electrode arrays. Basic geometry foundations (e.g., buried walls) have been investigated, although, more complicated foundation designs (e.g., stepped footing, pile group with a pile cap) are widely used in the construction industr...
Article
Full-text available
To investigate the uplift performance of squeezed branch pile group under vertical and horizontal loads, field test of a 2 × 2 squeezed branch pile group designed according to the load of a 1000 kV ultra-high vacuum tower foundation was carried out. Parametric studies were performed by using the finite element analysis to study the influence of hor...
Article
Full-text available
Energy piles, a new type of heat exchanger that serves dual purposes, have gained increasing attention due to the growing energy demand and corresponding carbon emissions. Depending on intended operational requirements or by accident, energy pile groups may be subjected to cyclic and variable thermal loadings. This study presents the results from a...
Article
Full-text available
The underground energy geostructure represented by the energy pile is one of the key paths for the cooperative development of underground space and geothermal energy. Because of its advantages of low cost, high efficiency and no extra occupation of underground space, it has become a feasible alternative to the borehole heat exchanger. The change in...
Article
Full-text available
Prediction of the scour depth around non-uniformly spaced pile groups (PGs) is one of the most complex problems is hydraulic engineering. Different types of empirical methods have been developed for estimating the scour depth around the PGs. However, the majority of the existing methods are based on simple regression methods and have serious limita...
Article
Full-text available
Designing correct engineering infrastructures to reduce land degradation processes and considering natural elements to achieve this goal are key to correctly managing potential natural hazards affecting human activities and natural ecosystems. This research investigated the scour depth and velocity vectors around bridge piles with and without upstr...
Article
Full-text available
Earthquake-induced liquefaction is prone in a region with loosely saturated sand and higher seismic activity. In recent years, improvement techniques have been used as a pre-construction or retrofitting method for the current construction. Several methods are intended as remedial techniques, which include either densifying the deposit soil, inserti...
Article
Full-text available
The work at hand proposes a method for assessing, under reasonable hypotheses from an engineering perspective, the failure envelope of a pile group subjected to generalized loading conditions involving a vertical and a lateral force along with a moment. Following different assumptions of increasing complexity, a simple closed-form expression, which...
Article
Full-text available
Piles, which are always exposed to dynamic loads, are widely used in offshore structures. The dynamic response of the pile-soil-superstructure system in liquefiable soils is complicated, and the interaction between the pile and soil and the pile volume effect are the key influencing factors. In this study, a water-soil fully coupled dynamic finite...
Article
Full-text available
With growing demand for renewable wind energy, the number of offshore wind turbines increased rapidly in recent years. This paper uses the improved Tajimi model and transfer matrix method to analyze the dynamic response of pile group supported offshore wind turbine under wind and wave load. The vibration equation of the structure is established by...
Presentation
Full-text available
this presentation to know how can calculate settlement and design of pile group
Article
Full-text available
In order to study the seismic performance of the rigid pile composite foundation, a three-dimensional finite element analysis of the seismic response of the rigid pile composite foundation with microprobe group was proposed. The three-dimensional finite element method is used to analyze the dynamic response law of pile group rigid pile composite fo...
Conference Paper
Full-text available
The potential reduction of vibrations caused by moving loads in the vicinity of pile group foundations is investigated for different layout geometries by means of finite-element analyses in the time-domain. First, the piles are indirectly excited by the wave field induced by a distant, stationary harmonic load. For given soil properties, the effect...
Article
Full-text available
Scour can cause the water-induced failure of fluvial and marine bridges and structures. Previous studies have focused on the scour mechanisms and their effects on the load capacity of single piles, although deep foundations consist mostly in pile groups. In this paper, scouring on pile groups embedded in soft clay is studied when piles are laterall...
Article
Full-text available
For pile group foundations used in cold regions with frequent seismic activity, the pile cap embedment conditions and freezing-thawing effect of soil layer deserve concerns in seismic design. In this study, quasi-static tests are carried out to investigate seismic failure characteristics of the bridge pile foundation with elevated and embedded caps...
Article
Full-text available
Load transfer functions, such as the t-z and q-z curves, combined with numerical methods implemented by computational programs are nowadays widely used in geotechnical design of deep foundations. It is known that in this type of design, piles are more often employed in groups instead of isolated. Within this context, the purpose of this research wa...
Article
Full-text available
The nonlinear load-settlement behaviours of vertically loaded pile groups containing various numbers of piles (up to a few hundred piles in a group) are analysed using the method proposed by Lee and Xiao. This back-analysis method assumes the “local shear displacement” of a thin layer of disturbed soil along the pile–soil interface and the soil out...
Article
Full-text available
In this study, a 3D numerical model, considering the dynamic interaction between soil, pile foundation, and super structure, and the parameter analysis of internal force response of pile group foundation under differences seismic intensity, was established based on the Bangladesh sewage treatment plant project to investigate the dynamic response of...
Article
Full-text available
A nonlinear load-transfer method for determining the load-settlement curve for a single pile and pile groups under axial loads is presented. The model allows slippage, or plastic soil deformation, and introduces a new exponential model for load-transfer modeling either strain hardening or softening. Long term deformations of soil layers and pile ma...
Article
Full-text available
Determination of negative skin friction force and The neutral plan is one of the challenges which face geotechnical engineers. Unfortunately, negative skin friction decreases the bearing capacity of pile because of the extra compressive force on the pile. In this research, a 3D FE models were used to investigate the behavior of single pile and pile...
Article
Full-text available
This paper presents a series of field tests to investigate the dynamic behavior of floating single pile and pile groups in multi-layered soil. In addition, an analytical approach is proposed for pile head stiffness under horizontal loading. The effective coefficient of pile group is obtained according to the head stiffness from experiment and theor...
Article
Full-text available
Footings are constructed closely to each other in mountainous rock areas and the determination of closely spaced bearing capacity footings on rock masses has become an important topic of recent research. The primary aim of this paper is to determine an efficiency factor, just like in the design of a pile group, that can be used to evaluate the bear...
Article
Full-text available
Submerged pile groups are important components of complex piers in hydraulic engineering and are analogs for a range of subsea structures. These may sustain severe damages from local scour. The velocity intensity ( U / U c , the ratio of critical velocity to mean velocity) and aspect ratio ( H / D p , the ratio of pile height to pile diameter) are...
Article
Full-text available
Foundation piles can be used as a means for increasing the capacity of the foundations under static loads or, at the same time, can be regarded as an additional source of energy dissipation for the structure during strong motion. Under multi-axial loading the ultimate capacity of a pile group is closely connected with the attainment of the flexural...
Conference Paper
Full-text available
Stochastic finite element method (SFEM) is used to consider the spatial variability in the material properties of the model components by utilizing random fields (RF). When combined with a robust reliability framework of analysis, SFEM offers significant advantages as compared with conventional deterministic FE analysis particularly for complex sys...
Article
Full-text available
Extensive numerical and analytical studies exist that focus on the scours around bridge piers with different cross-sections. However, studies addressing the scour around bridge piles are rather limited and not conclusive. Therefore, the most efficient cross-section reducing the local scour around a pile group is experimentally examined herein. Acco...
Conference Paper
Full-text available
The majority of heavy or strongly loaded structures, for instance high-rise buildings, large span bridges or gas storage tanks are founded on pile groups. However, current design codes and guidelines do not provide a standard procedure for their design under lateral dynamic and high-cyclic loading arising from e.g. wind, temperature or earthquake l...
Article
Full-text available
This paper presents a comprehensive numerical study on kinematic response of vertical and batter pile groups in soft soil, where soil non-linearity, batter angle, pile spacing and excitation frequency are related to pile-cap displacements, rotations, maximum pile moments, shear forces and axial forces. The finite element model is constructed in Ope...
Article
Full-text available
The overlapping displacement fields among closely spaced piles termed as pile-to-pile interactions, increase the overall settlement of pile groups. Resultantly, under static loading, these interactions invariably decrease the group stiffness of piles than the collective stiffnesses of corresponding single piles. Whereas under dynamic loading, the g...
Article
Full-text available
Soil-structure interaction is a complex problem to address in structural design due to difficulties related to the modelling of the soil-foundation behaviour, which is frequency-dependent and affected by uncertainties. The substructure method is an efficient approach to include the soil-foundation behaviour in the superstructure response, since it...
Article
Full-text available
A composite foundation combining pile foundations and spread foundations is often used on sites with an inclined bearing stratum. In Japan there are many such sites. The Architectural Institute of Japan added a new chapter about composite foundations in its 2019 revision of “Recommendations for Design of Building Foundations”. It is expected that t...
Article
Full-text available
Simplified procedures, capable of predicting the main effects of soil-structure interaction (SSI), involving minimum computational effort are desired in engineering practice. Besides, user-friendly approaches can be incorporated into guidelines or practical recommended procedures. Nevertheless, approximate solutions need to be carefully validated t...
Article
Full-text available
With the development of offshore wind power in deep water, jacket foundations are increasingly used. These piles are always thin-walled pipe piles, whose dynamic interactions are different from onshore pile groups in several ways; for example, scour may develop around the piles, which may reduce a single pile’s impedance, the dynamic interactions b...
Article
Full-text available
Batter piles are most commonly used to resist large lateral loads caused by winds, tidal waves and soil pressure as experienced by offshore structures, bridges, and towers in general. The details in literature on the dynamic behaviour of these batter piles based on in-situ tests are limited. The present study focused on dynamic lateral behaviour of...
Article
Full-text available
Full-scale shake table testing was conducted to evaluate the seismic performance of single and grouped helical piles. Eight circular and one square helical piles with different properties including length, radius and number of helices, as well as one driven circular pile were installed in dry sand enclosed in a laminar soil shear box that was situa...
Article
Full-text available
As a common geohazard, landslides may cause enormous losses of human lives and properties. It is necessary to prevent landslides by effective technical measures. The grouted micro-steel-pipe pile group is a typical composite anti-sliding structure applied in landslide-stabilization engineering, where the micropiles and the surrounding geomaterials...
Article
Full-text available
During the construction of a bridge, due to the deep sand mining in the riverbed at the bridge site, a sand mining disturbance stratum is formed at the bridge site, and it has an impact on the construction quality of the pile group foundation. In this paper, in view of the special geological conditions caused by sand mining, the high-pressure jet g...
Article
Full-text available
The bearing capacity of the vertical underpinning structure system is the key index in the design of top-down construction for adding a basement layer under existing buildings. The influence of the lateral restraint is the most significant under the dynamic construction excavation. For the problem of the bearing capacity of the existing engineering...
Article
Full-text available
This study was conducted to investigate the lateral behavior of inclined anchored pile group by using (3 pile) model embedded in sandy soil by relative density 65% under lateral static load. The distances used between the piles are 60 mm which represents (3) Dh (helix diameter), noting that the diameter of the pile is 10 mm. The types of piles used...
Chapter
Full-text available
The present paper aims to study the behavior of piles group surrounded by grout material under the effect of seismic loads. In this study, El Centro earthquake data were used as input time acceleration history with maximum peak ground acceleration (PGA) of 0.31g. Several cases were analyzed numerically to evaluate the piles group behavior under the...
Article
Full-text available
Onshore wind turbine foundations are subjected to large overturning moments. The wind action imposes cyclic and dynamic loading conditions which occur in extreme and service scenarios. Deep foundations, when used, transfer this large overturning moment through a pile group which combines the axial and lateral resistance of all piles. The paper expl...
Article
Full-text available
The tests were conducted in poorly graded sand prepared at three relative densities. Different parameters were considered such as method of installation, relative density, removal of soil plug, pile length to diameter ratio, and the ratios of friction and end resistance contribution with respect to ultimate bearing capacity. It was concluded that t...
Experiment Findings
Full-text available
Failure mechanisms for shallow foundations: bearing capacity, sliding, overturning. p-y / t-z / q-z curves and impedance functions for piles and pile groups. Sequence of the Open course available on the MOOC platform: www.coursera.org
Article
Full-text available
In this paper, the group effect on dragload on pile group subjected to negative skin friction is studied. The effect of pile spacing, pile location in a group and pile number is studied using finite element program PLAXIS 3D. Single pile, 2x2 pile groups and 3x3 pile groups with pile spacing 2d and 3d existing in soft clay layer overlying dense san...
Article
Full-text available
This paper is based on a shaking table test of 2 × 2 straight pile groups and 2 × 2 inclined pile groups in non-liquefied sand and saturated sand with different thicknesses. Under the sine wave with a certain peak acceleration and frequency, the lateral dynamic response characteristics, the distribution law of the maximum bending moment envelope di...
Conference Paper
Full-text available
Helical pile is an emerging deep foundation technique used in advanced countries. The compressive capacity of helical pile is greater than conventional piles. Its capacity depends on the number of helix, inter helix spacing, pile group spacing, helix diameter, helix diameter configuration, embedment depth, shaft diameter etc. In this paper, paramet...
Article
Full-text available
If the rigidity and the bearing capacity of the soil under a superstructure are not efficient to bear loads of structures, a common remedy is to increase the depth of the footing to transmit loads to soil layers having high bearing capacity (well graded dense gravel, gravelly sand, hard clay, rock, etc.) by using the pile group. Piled raft foundati...
Article
Full-text available
Laboratory model testing of single pile and superlong pile groups in saturated silty sand was conducted to investigate the response and bearing behavior of superlong pile groups with a high or low cap under vertical loads. The load transfer mechanism and bearing behavior of the pile shaft were discussed in detail. The load-settlement curve of the l...
Article
Full-text available
In this study, the suitability of the pseudostatic approach for the seismic analysis of pile foundations in layered soils is explored by means of experimental data from centrifuge tests performed at 60g. A free-head single pile and a capped (1 × 3) pile group, embedded in a two-layered soil comprising a soft clay layer underlain by dense sand, are...