Comparison of the bearing capacities of a small-diameter bored pile obtained from the results of field tests and numerical modeling
Article Sidebar
Main Article Content
Abstract
Abstract. The paper compares the results of modeling static soil tests with a small-diameter drill pile with the data obtained from field tests. The calculations were performed by numerical modeling using the PC software "Plaxis", which is based on the finite element method. This problem was solved in a flat (2D) formulation for an axisymmetric model, which makes it possible to analyze the stress-strain state (SSS) and the interaction of elements of the pile-soil environment system.
Separate computational models were created for two types of piles made using different technologies: a bored- CFA pile and a drilled pile with partial soil displacement. In order to take into account the preload history in order to maximize the models' approximation to real conditions, the calculations were performed in 4 stages in accordance with the construction sequence: Stage 1 - initial stage (determination of the initial stresses in the soil massif in the natural state), Stage 2 - excavation to the design mark of the pit bottom, Stage 3 - testing of the soils with a pile by static load. Stage 4 - pile unloading. Based on the results of the calculations, the SSS and the interaction of the elements of the "pile-soil environment" system have been analyzed and compared the settlement graphs obtained from the results of the calculations with the data of field tests.
It is shown that the use of a plane axisymmetric FEM is a sufficiently effective approach for assessing the stress-strain state and understanding the interaction of elements of the pile-soil system, as well as predicting the bearing capacity of piles for further design of the pile foundation before obtaining the results of field tests. In addition, the labor intensity and time consumption of this approach are relatively low compared to other alternative methods.
With appropriate experience in using this approach in different soil conditions with appropriate comparison with field test data, it can be applied in the feasibility study and final decisions on the choice of a particular type of foundation.
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
Бойко І.П. Визначення несучої здатності буроін’єкційної палі великого діаметру за допомогою різних методів. / І.П. Бойко, Ю.В. Карпенко, С.М. Новофастовський, В.С. Подпрятов // Основи і фундаменти: Міжвідомчий науково-технічний збірник. – К.: КНУБА – 2004. – Вип. 28. ‒ С. 79-94.
Маєвська І. В. Вдосконалення методики визначення несучої здатності бурових паль. / І. В. Маєвська, Н. В. Блащук, С. В. Романов // Будівельні конструкції. Міжві-домчий науково-технічний збірник. – К.: НДІБК. – 2016. – вип. 83. – С.616-625.
Винников Ю. Л. Математичне моделюван-ня влаштування та роботи буро-ін’єкційних паль / Ю. Л. Винников, В. П. Левченко, А. М. Пащенко // Будівельні конструкції. Міжвідомчий науково-технічний збірник. – К.: НДІБК. – 2011. – вип. 75: В 2-х кн.: Книга 2 – С.140-149.
Зоценко М. Л. Особливості влаштування буроін’єкційних паль у водонасичених піщаних ґрунтах / М. Л. Зоценко та ін. // Збірник наукових праць (галузеве машино-будування, будівництво). – Полтава: ПНТУ, 2010. – Вип. 3 (28). –– с. 82-88.
Tol F. Modelling the bearing capacity of dis-placement piles in sand. / Tol F, Broere W. // Proceedings of The Institution of Civil Engi-neers-geotechnical Engineering – E.: ICE Publishing, 2006 – pp.195-206.
Cabella E. Axially loaded pile; numerical models vs. experimental data. / Cabella E., Passalacqua R // Application of Numerical Methods to Geotechnical Problems – Vien-na: Springer, 1998 – pp. 97–106.
Kos J. Non-linear analyses of axially and laterally loaded bored piles. / Kos J // Appli-cation of Numerical Methods to Geotech-nical Problems – Vienna: Springer, 1998 – pp. 121–130.
Wenhert M. Numerical analyses of load tests on bored piles. / Wenhert M., Vermeer P. A. // Proceedings of the 9th International Sym-posium on Numerical Methods in Geome-chanics – Ottawa: Balkema, Leiden, 2004 – pp. 505–511.
ДСТУ Б В.2.1-1-95 (ГОСТ 5686-94) Ґрун-ти. Методи польових випробувань паля-ми. – К: Укрархбудінформ, 1997. – 58 с.
ДСТУ Б EN 1536:2015 Виконання спеціа-льних геотехнічних робіт. Палі бурові (EN 1536:2010, IDT) – К.: ДП «ДНДІБК», 2016. – 116 с.
ДСТУ Б В.2.1-27:2010 Основи та фунда-менти споруд. Палі. Визначення несучої здатності за результатами польових ви-пробувань. – К.: ДП «ДНДІБК», 2010. – 10 с.
Boyko I.P, Karpenko Y.V., Novofastovskyi S.M., Podpriatov V.S. (2004) Vyznachennia nesuchoi zdatnosti buroiniektsiinoi pali velykoho diametru za dopomohoiu riznykh metodiv [Determination of the bearing ca-pacity of a large-diameter borehole injection pile with the help of various methods]. Os-novy i fundamenty: Mizhvidomchyi naukovo-tekhnichnyi zbirnyk. Kyiv: KNUBA, 28, 79-94 (in Ukrainian).
Mayevska, I.V., Blaschuk N.V., Romanov S.V. (2016) Vdoskonalennia metodyky vyznachennia nesuchoi zdatnosti burovykh pal [Improvement of the method of deter-mining the bearing capacity of bored piles]. Budivelni konstruktsii. Mizhvidomchyi nau-kovo-tekhnichnyi zbirnyk. - Kyiv: NDIBK, 83, 616-625 (in Ukrainian).
Vynnykov Y.L., Levchenko V.P., Pashchen-ko A.M. (2011) Matematychne modeliuvan-nia vlashtuvannia ta roboty buroiniektsi-inykh pal [Mathematical modeling of the in-stallation and performance of CFA piles]. Budivelni konstruktsii. Mizhvidomchyi nau-kovo-tekhnichnyi zbirnyk. Kyiv: NDIBK, 75, Book 2, 140-149 (in Ukrainian).
Zotsenko M.L. (2010) Osoblyvosti vlash-tuvannia buroiniektsiinykh pal u vodo-nasychenykh pishchanykh gruntakh [Spe-cialties of CFA pile installation in water-saturated sandy soils]. Zbirnyk naukovykh prats (haluzeve mashynobudu-vannia, budivnytstvo), Poltava: PNTU, 3 (28), 82-88 (in Ukrainian).
Tol F., Broere W. (2006). Modelling the bear-ing capacity of displacement piles in sand. Proceedings of The Institution of Civil Engi-neers-geotechnical Engineering, E.: ICE Publishing, 159. 195-206 (in English).
Cabella E., Passalacqua R. (1998) Axially loaded pile numerical models vs. experi-mental data. Application of Numerical Meth-ods to Geotechnical Problems. Vienna: Springer, 97–106 (in English).
Kos J. (1998) Non-linear analyses of axially and laterally loaded bored piles. Application of Numerical Methods to Geotechnical Prob-lems. Vienna: Springer, 121–130 (in Eng-lish).
Wenhert M., Vermeer P. A. (2004). Numeri-cal analyses of load tests on bored piles. Proceedings of the 9th International Sympo-sium on Numerical Methods in Geomechan-ics. Ottawa: Balkema, Leiden, 505–511 (in English).
DSTU B V.2.1-1-95 (GOST 5686-94) (1997) Grunty. Metody polovykh vyprobuvan paliamy [Soils. Field test methods with piles]. Kyiv: Ukrakhbudinform, 58 (in Ukrainian).
DSTU B EN 1536:2015 (2016) Vykonannia spetsialnykh heotekhnichnykh robit. Pali bu-rovi [Execution of special geotechnical works. Bored piles]. (EN 1536:2010, IDT), Kyiv: NDIBK, 116 (in Ukrainian).
DSTU B B.2.1-27:2010 (2010) Osnovy ta fundamenty sporud. Pali. Vyzna-chennia nesuchoi zdatnosti za rezultatamy polovykh vyprobuvan [Bases and foundations of structures. Piles. Determination of bearing capacity based on the results of field tests]. Kyiv: NDIBK, 10 (in Ukrainian).