Features of interaction bored pile with the soil base in the presence of structurally unstable soils
Article Sidebar
Main Article Content
Abstract
During the construction of pile foundations, the pile testing process is necessary and mandatory. Therefore, there is a need for a correct assessment of the interaction elements of the "foundation-pile" system with the provision of a reliable and effective design solution.
If the soil parameters provided in the reports on engineering and geological searching are used without their prior refinement, this leads to a significant discrepancy in the results of numerical modeling of the interaction of piles with the base and data from field tests. In this regard, there is a need to identify the design parameters of the adopted soil model in order to match the modeling results with the results of experimental studies in a wide range of loads.
The Hardening Soil Model was chosen to describe the interaction behavior of the elements of base-pile system in this study. The nature of the influence of the three modules identified in the above model was investigated: modulus deformation at 50% of the base strength ( ); compressive strain module ( ); strain module at unloading ( ). The influence of the effect of dilatancy of the sand base was also analyzed.
At the initial stage of loading, the values of the and modules make a significant contribution to its performance. With further increased loads in the soil, significant plastic shear deformations occur, and accordingly, the parameters of soil strength (c, φ) are the leading parameters. Due to the fact that the upper part of the bored pile is located in structurally unstable soils (bulk soil and plastic sandy loam), and the lower part of the pile is located within sandy soil for a significant part of its length, it is also important to take into account the effect of soil dilatancy (ψ).
It was found that an increase in the unloading module ( ) reduces not only the settlement along the unloading curve, but also along the load curve.
The results of comparison of full-scale testing of a bored pile and its numerical modeling of interaction with structurally unstable and sandy soils are presented, and the design parameters of the soil environment model are identified in order to match the modeling results with experimental data at the corresponding specified loads.
The obtained convergence is within 5% in a wide range along the curve of the load on the bored pile.
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
Schanz, T. Formulation and verification of the Hardening Soil model / T. Schanz, P.A. Vermeer, P.G. Bonnier // Beyond 2000 in Computational Geotechnics. – Balkema, Rotterdam, 1999.
Бойко І.П. Методи випробувань ґрунтів за допомогою буроін’єкційної палі великого діаметру / І.П.Бойко, Ю.В.Карпенко, С.М.Новофастовський // Основи і фундаменти: Міжвідомчий науково-технічний збірник. – К.: КНУБА. – 2004. – Вип. 28. – с. 11-16.
Katzenbach R. Costoptimized foundation systems of high rise structures, based on the results of actual geotechnical research / R.Katzenbach, H.Hoffmann, M.Vogler, Ch.Moormann // Proc. International Conference Trends in Tall Building – Tendenzen im Hochhausbau, Frankfurt am Main, 5-7.9.2001, с. 421-443.
Зоценко Л.М. Особливості влаштування буроін’єкційних паль у водонасичених піщаних ґрунтах / Л.М. Зоценко, В.П. Левченко, С.В. Біда, М.Ф. Передерій // Зб. наук. праць (Галузеве машинобудування, будівництво). – Полтава: ПНТУ, 2009. - 76с.
Бойко І.П. Числове моделювання взаємодії бурової палі з врахуванням дилатансії ґрунту / І.П.Бойко, О.А.Кривенко, О.В.Гаврилюк // Науково-технічний збірник «Основи та фундаменти». – К.: КНУБА. – 2023 . – Вип. 46. – С.9-16.DOI:10.32347/0475-1132.46.2023.9-16.
Schanz, T., Vermeer, P.A., Bonnier, P.G. (1999). Formulation and verification of the Hardening Soil model. Beyond 2000 in Computational Geotechnics. Balkema, Rot-terdam.
Boyko I.P., Karpenko Yu.V., Novofastov-skyi S.M. (2004) Metody vyprobuvan grunt-iv za dopomohoiu buroiniektsiinoi pali velykoho diametru [Methods of soil tests us-ing large-diameter continuous flight auger piles] Osnovy i fundamenty: Mizhvidomchyi naukovo-tekhnichnyi zbirnyk. Kyiv: KNU-BA, 28, 11-16 (in Ukrainian).
Katzenbach R., Hoffmann H., Vogler M., Moormann Ch. (2001). Costoptimized foun-dation systems of high rise structures, based on the results of actual geotechnical re-search. Proc. International Conference Trends in Tall Building – Tendenzen im Hochhausbau. Frankfurt am Main, 5-7.9.2001, с. 421-443.
Zotsenko, L.M., Levchenko, V.P. Bida, S.V., Perederii, M.F. (2009). Osoblivosti vlash-tuvannya buroinektsiynih pal u vodonasi-chenih pischanih gruntah [Features of the in-stallation continuous flight auger piles in wa-ter-saturated sandy soils]. Zb. nauk. prats (Galuzeve mashinobuduvannya, budIvnit-stvo). Poltava: PNTU, 76 (in Ukrainian).
Boyko, I.P., Krivenko, O.A., Gavryliuk, O.V. (2023). Chyslove modeliuvannia vzaiemodii burovoi pali z vrakhuvanniam dylatansii gruntu [Numerical simulation of interaction bored pile and soil mass with tak-ing into account the dilatancy of the soil]. Osnovu ta fundamenty: Naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 46, 9-16. DOI:10.32347/0475-1132.46.2023.9-16. (in Ukrainian).