Identification of soil parameters in the calcu-lation of high-rise buildings on pile foundation
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Abstract
The results of numerical modeling of the interaction of bored piles with the soil environment are presented. The process of identifying soil parameters according to static tests of piles was studied. The parameters of the soil, which have the greatest influence on the change in the graph of the dependence of the pile settlement on the load, are singled out.
The research process can be divided into the following stages: creation of a numerical model of the interaction of the pile with the volumetric soil array in the PC «LIRA-Sapr». The size of the array is 30x30x40 m, based on the research of scientists [1]. The pile is defined be a rod finite element (pile length 30 m, diameter 0.82 m). The array is defined by non linear finite elements with characteristics according to data from engineering and geological studies. The load is applied step by step (10 steps) with a maximum value of 600 ton-forces. 4 variants of the volumetric soil massif with different values of the modulus of elasticity were considered. In the first variant, the modulus of elasticity is unchanged, in the second it is increased by 2 times, in the third by 3 times and in the fourth variant by 4 times. The modulus of elasticity increased simultaneously in all elements of the soil massif. According to the calculation, it was established that when the elasticity modulus is increased by 4 times, the graph of the dependence of the settlement on the load is close to the graph of field tests. Further, the identification of the angle of internal friction was carried out, with an increased modulus of elasticity by 4 times. It was established that in the soil model with the angle of internal friction taken with a factor of 0.5, the settlement graph of the test pile is very close to the test graph. Therefore, for the calculation of the «base – foundation – above-ground structures» system, it is customary to increase the elasticity modulus by 4 times and take the angle of internal friction with a factor 0.5.
The calculation of the «base – foundation – above-ground structures» system for a high-rise building with identified soil parameters and with parameters that were before identification was performed. The stress- strain state of foundation structures for two variants of soil conditions was investigated. Redistribution of forces in foundation structures with both variants of soil parameters is given
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References
Бойко І. Числове моделювання взаємодії буроін’єкційної палі з грунтовим масивом при дії статичного вертикального наван-таження. / І. Бойко, О. Кривенко // Основи та фундаменти: Науково-технічний збір-ник. – К.: КНУБА. – 2021. – Вип. 43. – С. 9-16.
Бойко І. Ідентифікація параметрів грунту на основі натурних випробувань паль. / І. Бойко, Л. Скочко, М. Хоронжевський // Основи та фундаменти: Науково-технічний збірник. –К.: КНУБА. – 2021. – Вип. 42. – С. 9-18.
Носенко В. Визначення напружено-деформованого стану групи паль шляхом числового моделювання їх взаємодії з ос-новою за даними польових досліджень. / В. Носенко, О. Кашоїда // Основи та фун-даменти: Науково-технічний збірник. – К.: КНУБА. – 2021. – Вип. 43. – С. 87-100.
Носенко В.С. Напружено-деформований стан пальово-плитних фундаментів сек-ційних висотних будинків: дис. ... канд. техн. наук: 05.23.02 / Носенко Віктор Сер-гійович. – К.: КНУБА, 2012. – 175с.
Основи та фундаменти споруд. Зміна № 1: ДБН В.2.1–10–2009. – [Чинний від 2011–07–01]. – К.: Мінрегіонбуд України, 2011. – 55с.
Бойко І.П. Особливості взаємодії пальо-вих фундаментів під висотними будинка-ми з їх основою. / І.П.Бойко // Основи і фундаменти: Міжвідомчий науково-технічний збірник. – К.: КНУБА. – 2006. – Вип. 30. – С. 3-8.
Boyko I., Krivenko O. (2021). Chuslove modeliyvannia vzaiemodii byroinektsiinoi pali z gryntovum masuvom pru dii statuchnogo vertukalnogo navantajennia [Numerical simulation of interaction contin-uus flight auger pile with a soil mass under static vertical load]. Osnovu ta fundamenty: Naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 43, 9-16 (in Ukrainian).
Boyko I., Skochko L., Khoronzhevskyi M. (2021). Identifikatsia parametriv gryntiv na osnovi rezyltativ natyrnih vuprobyvan pal [Identification of soil parameters based on the results of field tests of piles]. Osnovu ta fundamenty: Naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 42, 9-18 (in Ukrainian).
Nosenko V. Kashoida. O. (2021). Vyznachennia napryjeno-deformovanogo stany grypi pal shliahom chislovogo modeli-yvannia ih vzaiemodii z osnovoiy za dan-nimi poliovih doslidjen [Determination of the stress-strain state of group of piles by numerical simulation of their interaction with the base according to field research data]. Osnovu ta fundamenty: Naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 43, 87-100 (in Ukrainian).
Nosenko V.S. (2012). Napruzheno-deformovanyj stan paljovo-plytnykh fundamentiv sekcijnykh vysotnykh budynkiv [Stress-strain state of plate-pile foundations of sectional high-rise buildings]. Dys. kand. tekhn. nauk: 05.23.02. Kyiv: KNUBA, 175 (in Ukrainian).
Osnovy ta fundamenty sporud. Zmina 1: DBN V.2.1–10–2009. (2011). Kyiv: Minregionbud Ukrayiny, 55 (in Ukrainian).
Bоyko I.P. (2006). Osoblyvosti vzaiemodii palovykh fundamentiv pid vysotnymy budynkamy z yikh osnovoiu [Features of the interaction of pile foundations under high-rise buildings with their foundation]. Osnovu i fundamenty: Mizhvidomchyj naukovo-tekhnichnyj zbirnyk. Kyiv: KNUBA, 30, 3-8 (in Ukrainian).