On the Stress-Strain State and Load-Bearing Strength of Argillite-Like Clays and Sandstones

Ponomarev, A. B.; Sychkina, E. N.

doi:10.1007/s11204-018-9517-1

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…При возведении конструкций фундаментов, изготавливаемых с применением буронабивных свай, наиболее важным параметром является геометрическая точность между сваей, принятой в проектной документации, и сваей, фактически изготовленной на строительной площадке [1][2][3][4]. На изменяемость геометрии будущего тела сваи после выполнения буровых работ может повлиять такой фактор, как потеря устойчивости стенки скважины, что приведет к обрушению грунта в забой скважины [5,6].…”

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Method for Calculating the Stability of the Walls of a Drilling Well When Installing Bored Piles

Popov

Savinova

2020

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In this article, the authors aim to consider a fundamentally new methodology for calculating the stability of the walls of a borehole in the manufacture of foundations using bored piles. This kind of foundations is increasingly used in construction practice in connection with the growing and compacting development of not only civil buildings, but also of reconstructed industries. There is a need for a more detailed consideration of external factors (in the area of soil massifs) that affect the stability of the walls of the borehole in the thickness of the soil. According to the authors, the technique establishes a relationship between the geometric parameters of the borehole, which include the depth of the borehole and its constant diameter throughout, and the physical and mechanical characteristics of the soil (specific gravity, angle of internal friction, and deformation modulus) of the construction site. The proposed calculation method allows us to determine at the design stage the need for additional measures to protect the walls of the wells from collapse when installing bored piles. Additional measures include the use of drilling fluids, the use of casing pipes and more. The need for the appointment of these measures entails the emergence of a significant economic component in the final cost of the object. When carrying out design work, modern realities require a detailed justification of the decisions made in order to reduce material consumption and labor intensity, and ultimately the cost of the facilities. According to the results of the work done in the course of the mathematical experiment, the necessary dependence was established by the authors of the article. The borehole will maintain its geometric immutability in the case when the stress in the soil is less than the rigidity of the soil element allocated for the construction of a mathematical experiment.

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Section: © Pnrpuunclassified

Method for Calculating the Stability of the Walls of a Drilling Well When Installing Bored Piles

Popov

Savinova

2020

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“…В настоящее время свайные фундаменты широко применяются при строительстве высоконагруженных зданий и сооружений. В работах [1][2][3][4] было доказано, что механические свойства грунта основания фундамента определяются особенностями его формирования. В данном исследовании рассмотрены результаты численного моделирования работы забивных свай на грунтовом основании, сложенном аргиллитоподобными глинами пермского возраста, имеющими широкое распространение в европейской и южной части России, странах Западной Европы и Центральной Азии [5,6].…”

Section: Introductionunclassified

“…Вопросами функционирования свайных фундаментов в глинистых грунтах, в том числе опирающихся на аргиллитоподобные глины, занимались многие ученые [2][3][4][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. В работах [2][3][4] было выявлено, что характер взаимодействия одиночной сваи с массивом аргиллитоподобных глин значительно отличается от характера взаимодействия сваи с дисперсными глинистыми грунтами. Экспериментальные и теоретические исследования [11,12] свидетельствуют о том, что при проектировании свайных фундаментов по предельным состояниям первостепенное значение будет иметь расчет осадок и их накопление во времени.…”

Section: Introductionunclassified

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Numerical investigations of work of driven pile on claystones

2019

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Introduction. Reviewed the features of the work of the pile on Permian claystones with the help of numerical and field experiments, analytical calculations. Materials and methods. Numerical modeling was performed in the Plaxis 3D and Midas GTS NX software packages. Full-scale tests of driven piles are made in accordance with the requirements of GOST 20276-2012. The obtained results are compared with the results of analytical calculations according to SP 24.13330.2011. Results. The scientific novelty of the investigation consists in a comparative analysis of the results of numerical modeling of the interaction of a driving pile with claystones with the results of field tests and analytical calculations. Finite element analysis in software package Plaxis 3D using Hardening Soil model shows higher values of settlement (up to 6 times) in relation to stabilized settlement of full-scale pile tests. Calculations in the software package Midas GTS NX showed overestimated values of pile settlements in relation to full-scale pile tests (13-24 times). Analytical calculations in accordance with SP 24.13330.2011 also showed overestimated (up to 3 times) values of the maximum pile settlement in relation to the stabilized settlement during full-scale pile tests. Conclusions. The calculations by the finite element method in the package Plaxis 3D and Midas GTS NX, by the analytical method according to SP 24.13330.2011, show overestimated values of settlement in relation to the stabilized settlement of piles on claystones. Using the Linear-Elastic model for claystones in numerical calculations in Plaxis 3D provides a value close to the settlement of full-scale pile. However, the use of this model is not fully justified for claystones due to the presence of residual deformations and the nonlinear character of pile settlement during loading. Necessary to correct the existing numerical and analytical methods for calculating pile foundations on claystones. It is necessary to continue the work on the further generalization of the experience of arranging piles on weathered claystones in order to evaluate the long-term work of not only a single pile, but also a pile foundation.

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