Interaction between a subsoil and group of piles joined with a raft
Article Sidebar
Main Article Content
Abstract
Most pile-slab foundations are designed without taking into account the contribution of growth. Although it is well known that the grille plays an important role in overall load-bearing capacity. In such structures, the overall subsidence of the foundation is likely to be small due to the installation of more piles than necessary. However, from an economic point of view, it is desirable that the foundation be designed in such a way that the subsidence is limited to an acceptable level, but taking into account the bearing capacity of growth.
The main problem is a work of pile’s group taking into account interaction between piles through a soil base is considered. During the interaction there are additional stresses in the inter-pile space, there is an effect of "compression" of the piles by the soil from the loads transmitted to neighboring piles.
This paper presents the results of a study of the joint work of piles and grilles under the action of static load using numerical simulations. The study used a group of piles (5 pcs.) With a diameter of 420 mm and a length of 10 m, combined with a grid. Fine sand of medium density was used as the basis of the pile foundation.
Numerical modeling was performed using an ideal elastic-plastic model with the Coulomb-Mohr strength criterion.
The work of piles at different distances between piles (1.5-2.5 m) and grating thickness 300 was compared; 500mm.
The interaction of piles and growth-verification with the surrounding soil mass is analyzed. At the lower end of the pile, in the area of contact of the pile with the ground there is a complex stress-strain state. The pitch, diameter, length of the piles, as well as the rigidity of the grille have a significant effect on this stress-strain state. Taking into account the influence of these factors is necessary to determine the patterns of distribution of external loads between the piles and the grille.
Irregular settling of the group was revealed
piles joined by a grid. The central and extreme piles are included in the work in different ways.
It is established that the inclusion of the pile grid in the work depends on its stiffness, as well as the axial distance between the piles.
It is investigated that when the distance between the piles changes, the redistribution of forces in the growth piles and piles changes.
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors are published in this journal, agree to the following conditions:
Authors reserve the right to authorship of their work and transfer the journal the right of the first publication of this work under the terms of the Creative Commons Attribution License, which allows other persons to freely distribute published work with mandatory reference to authors original work and the first publication of work in this journal.
The authors have the right to enter into independent additional agreements on the non-exclusive dissemination of the work in the form in which it was published by this journal (for example, to post work in the electronic repository of the institution or to publish as part of a monograph), provided that the reference to the first publication of the work in this journal is maintained.
The journal's policy allows and encourages the authors to place the manuscript of the work on the Internet (for example, in the institutions' storehouses or on personal websites), both for presenting this manuscript to the editorial office and during its editorial processing, as this contributes to the creation of productive scientific discussion and positively affects the efficiency and dynamics of citing the published work (see The Effect of Open Access).
References
Основи і фундаменти будівель та споруд. ДБН В.2.1-10-2009 [Чинні від 2009-07-01 ]. – К. : Мінрегіонбуд України“, 2009. – 84 с. – (Державні будівельні норми).
Бойко І.П. Особливості взаємодії пальових фундаментів під висотними будівлями з їх основою // Основи і фундаменти: міжвідомчий науково-технічний збірник.–К: КНУБА, 2006 – Вип. 30 –С. 3-8.
Цимбал С.Й. Експериментальне дослідження напруженого стану в основі моделі висячої палі // Республ. міжвідомчий науч.-техн. зб. Основи і фундаменти – Київ: Будівельник, 1973.- Вип.6. – С.134-141.
Randolph M.F. Design method for pile groups and piled rafts // 13th International Conference on Soil Mechanics and Foundation Engineering, 5-10 January 1994, New Delhi, India, Vol. 5, pp. 61-82.
Kull T., Mets M., Leppik V. Interaction of piles and raft // Proceedings of 13th Baltic Sea Geotechnical Conference. «Historical Experience and Challenges of Geotechnical Problems in Baltic Sea Region, 22-24 Sep-tember. – Lithuania, 2016.
Poulos H.G. Analysis of the settlement of pile groups // Geotechnique. 1968. Vol.18 Issue 4. Pp.449-469.
Russo G., Viggiani C. Factors controlling soil-structure interactions for piled rafts // Darmstadt Geotechnics (Darmstadt Universi-ty of Technology). – 1998. – No.4. – P.297-322.
K. Horikoshi, M.F. Randolph, A contribution to optimal design of piled rafts (1998) Géotechnique, 48, pp. 301-317.
Osnovy` i fundamenty` budivel` ta sporud. DBN V.2.1-10-2009 (2009) [Bases and foundations of buildings] Chy`nni vid 2009-07-01 – K.: Minregionbud Ukrayiny`, 2009. – 84 s. – (Derzhavni budivel`ni normy`).
Bojko I.P. (2006) Osobly`vosti vzayemodiyi pal`ovy`x fundamentiv pid vy`sotny`my` budivlyamy` z yix osnovoyu [Features of interaction of pile foundations under high-rise buildings with their bases]. Osnovy` i fundamenty`: mizhvidomchy`j naukovo-texnichny`j zbirny`k.–K: KNUBA, – Vy`p. 30 –S. 3-8. (in Ukrainian).
Tsymbal S.Y. Eksperymentalne doslidzhennia napruzhenoho stanu v osnovi modeli vysiachoi pali [Experimental study of the stress state at the heart of the hanging pile model]. Respubl. mizhvidomchyi nauch.-tekhn. zb. Osnovy i fundamenty – Kyiv: Budivelnyk, 1973.- Vyp.6. – S.134-141. (in Ukrainian).
Randolph M.F. (1994). Design method for pile groups and piled rafts. 13th International Conference on Soil Mechanics and Foundation Engineering, 5-10 January, New Delhi, India, Vol. 5, pp. 61-82.
Kull T., Mets M., Leppik V. (2016) Interaction of piles and raft. Proceedings of 13th Baltic Sea Geotechnical Conference. «Historical Experience and Challenges of Ge-otechnical Problems in Baltic Sea Region, 22-24 September. Lithuania.
Poulos H.G. (1968). Analysis of the settlement of pile groups. Geotechnique. Vol.18 Issue 4. Pp.449-469.
Russo G., Viggiani C. (1998). Factors controlling soil-structure interactions for piled rafts. Darmstadt Geotechnics (Darmstadt University of Technology). No.4. – P.297-322.
K. Horikoshi M.F., Randolph A. (1998). contribution to optimal design of piled rafts. Géotechnique, 48, pp. 301-317.