2 edition of behaviour of pile groups in sand. found in the catalog.
behaviour of pile groups in sand.
Thomas Hamilton Hanna
Written in English
Thesis (Ph. D.)--The Queen"s University of Belfast, 1960.
|The Physical Object|
The behavior of pile groups in sand under different loading rates is investigated. A total of 60 tests were conducted in the laboratory using model steel piles embedded in a medium dense sand. The model piles have an outside diameter of 25 mm and embedment length of mm. Five different configurations of pile groups (2 × 1, 3 × 1, 2 × 2, 2 × 3, 3 × 3) with center to center spacing. Abstract. The research focus of this paper is directed to investigate the behavior of a single model pile and pile groups in sand under both saturated and unsaturated conditions. Forty different model tests were performed on single piles and pile groups by varying the water-table level. Influence of matric suction, roughness of soil–shaft interface, dilation, and group action were investigated.
As a result of these cyclic loads, excessive differential or absolute settlements may be induced during the piles’ service life. In the research presented here, centrifuge modelling of single piles and pile groups was conducted to investigate the influence of cyclic axial loads on the performance of piled foundations. Reasonable agreement has been found between the observed and predicted behaviour of flexible piles. The analyses are also compared with the results of some field case records. Key words: bending moments, clay, displacements, inclined loads, instrumentation, lateral soil pressure, model test, pile, sand.
The cyclic axial behaviour of piled foundations in sand is studied using centrifuge tests. Model piles are partially jacked in flight. Loads are applied to identify cyclic tension loading effects in stable and meta-stable zones on pile behaviour and physical failure. () and Awad and Petrasovits () for model piles in sand. Full-scale field tests on single vertical and batter piles, and also groups of piles, have been made from time to time by many investigators in the past. The field test values have been used mostly to check the theories formulated for the behavior of vertical piles only. Murthy and.
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Piles in the leading row supported a large proportion of the group load and behaved similarly to the isolated single pile. Two‐way cyclic loading had little effect on the distribution of load to the piles in the group, but tended to densify the sand around both the single pile and the group by: One of the major difficulties in predicting the capacity of pipe piles in sand has resulted from a lack of understanding of the physical processes that control the behavior of piles during installation and monograph presents a detailed blue print for developing experimental facilities.
One of the major difficulties in predicting the capacity of pipe piles in sand has resulted from a lack of understanding of the physical processes that control the behavior of piles during installation and loading.
This monograph presents a detailed blue print for developing experimental facilities necessary to identify these processes. To study the behavior of pile groups, incorporating one dissimilar pile, buried in sand, laboratory tests were conducted on small scale models of aluminum piles.
Pile groups containing 2,3,6 and 9 piles were considered. The pile groups are attached to pile cap free standing from soil. The pile caps are machined from aluminum by: 3. Model pile load testing is effective to study the load-settlement behaviour of pile foundations given the controlled environment in which the testing is done.
This paper reports a testing program in a large calibration chamber involving individual piles and pile groups installed in sand samples of three different by: 5. Piled foundations are often subjected to cyclic axial loads.
This is particularly true for the piles of offshore structures, which are subjected to rocking motions caused by wind or wave actions. behaviour of pile groups in sand. book This paper presents the static lateral load behaviour of single pile in comparison with 3x3 pile group in sand.
The piled raft system is modelled using PLAXIS3D. In the present study a typical case of a piled raft with relatively smaller width, supported on two rows of piles on the edges was studied with small scale 1g model tests for understanding the basic behavior and a numerical study to obtain the details of raft settlement and the shaft stress distribution along the pile length.
Centrifuge model tests have been conducted on free-head and capped-head pile groups consisting of two, four, and six piles located adjacent to an unstrutted deep excavation in sand. It is found that when two free- or capped-head piles are arranged in a row parallel to the retaining wall, the interaction effect between piles is insignificant.
When two piles are arranged in a line perpendicular to. The lateral resistance is decreased and the lateral deflection of the piles is increased with an increase in the thickness of the contaminated sand layer and percentage of oil content.
For the middle pile in the lead row in the group, the maximum bending moment increased by about 40% at an oil content of 2% over that in clean sand. The agreement between observed and computed results is.
The behavior of pile groups in sand under different loading rates is investigated. A total of 60 tests were conducted in the laboratory using model steel piles embedded in a medium dense sand. The. In this paper, the ‘t–z method’ is employed to describe the nonlinear behaviour of a single pile and is used to obtain simplified predictions of pile group behaviour by considering the interaction between two-piles in conjunction with the Interaction Factor Method (IFM).
The principal inconvenience of the t–z method arises from the determination of the resisting curve’s shape; an. Thus, the main aim of this study is to discover the influence of oil-contaminated sand on the lateral behaviour of pile groups.
Single pile tests were also performed for comparison purposes. The results show that the thermo-mechanical behaviour of an energy pile group is different from that of a single energy pile in terms of the thermally induced change in axial pile stress and the.
Model tests by Chan and Hanna () showed that the cyclic response of displacement piles in sand is affected by the number (N) and the frequency (f) of cycles, the mean shaft load (Q mean) and the shaft cyclic amplitude (Q cyclic), as defined in Fig. 1, the pile depth (L), the loading history and the sand characteristics.
Distinctions are also often drawn between two-way (TW) loading, that. Activate pile group (modelled as “wished-in-place”) and deadweight on top of the pile cap. Increase stress level of the entire mesh (including soil, pile group and deadweight) by raising its gravitational acceleration from 1 g to 40 g.
Fix face of each tunnel section to be excavated. batter and vertical pile groups installed in medium dense sand. The software program GROUP V  was used in the analyses.
For calibration, results from the software were compared with experimental tests on batter pile groups found in the literature. Different design parameters were investigated in this. The current work is directed to study the behavior of single and group driven pile of square pattern (4 piles) in case of floating pile (friction pile) with different spacing (2D, 4D, 6D) and.
Thus, there is a need to enhance the lateral-load behaviour of the pile to serve many problems in practice. This paper is a part of a major study to enhance the lateral behaviour of piles by replacing the upper layers of soft clay with dense sand or cement−clay mix (CCM).
The main components to consider in analyzing the seismic behavior of pile groups are: 1) kinematic interaction between soil and piles; 2) inertial forces imposed by the superstructure; 3) pile-soil-pile interaction; and 4) nonlinear coupled soil (solid skeleton and pore water) response as a result of strong ground motions.
understanding of spacing effects on the behaviour of pile groups under static, active loading. Also touched on is the design of the model pile group used in the centrifuge tests, whose modular nature permits the straightforward reconfiguration and reuse of instrumented and non-instrumented piles and the interchanging of pile caps.groups in a soil profile comprised of a nonliquefied crust spreading laterally over a loose saturated sand layer.
Detailed instrumentation and new interpretation and data processing procedures enabled fundamental measurements of soil-pile interaction behavior in the centrifuge tests.The behavior of laterally loaded single piles and group piles in sand. [Chia-Cheng Fan; James H Long] -- The finite element method, along with an elastic-plastic sand constitutive model, is used to investigate the response of laterally loaded single and group piles in sand.