Theoretical Basis for Forecasting the Expansion of the Diameter of the Leading Well in Water-Saturated Soil with a Crushed Stone Bored Pile

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In the process of construction and operation of buildings and structures located on weak water-saturated clay foundations, there is often a need to change their physical and mechanical properties. Currently, various methods of surface and deep compaction are used to improve the characteristics of weak soils. It is known that in the process of deep compaction, the soil is compressed under the action of radial stress on the wall of the leading well using an auger (in reverse motion), pile foundation technology, a rotor, etc. In this paper, the main attention will be paid to solving the axisymmetric problem of consolidation of a soil cylinder under the influence of radial pressure. The diameter of the well in this case increases by 2–3 times and is filled with working material – sand and gravel mixture. The purpose of this study is to carry out a theoretical analysis based on a different approach to solving the problem of the stress-strain state of weak soil during compaction of weak foundations and determining the required characteristics of the compacted composite massif transformed by a bored crushed stone pile. The results of the study convincingly prove that the technology under consideration, based on the expansion of the diameter of the leading borehole in water-saturated soil using crushed stone pile drains, is one of the most cost-effective and efficient solutions. It can compete with traditional compaction methods and the more expensive use of deep foundations.

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作者简介

A. Ter-Martirosyan

National Research Moscow State University of Civil Engineering

编辑信件的主要联系方式.
Email: gic-mgsu@mail.ru

Doctor of Sciences (Engineering), Vice-Rector

俄罗斯联邦, 26, Yaroslavskoe Highway, Moscow, 129337

G. Anzhelo

National Research Moscow State University of Civil Engineering

Email: nocgeo@mail.ru

Candidate of Sciences (Engineering)

俄罗斯联邦, 26, Yaroslavskoe Highway, Moscow, 129337

M. Chan

National Research Moscow State University of Civil Engineering

Email: tranmanhthiem@gmail.com

Postgraduate Student

俄罗斯联邦, 26, Yaroslavskoe Highway, Moscow, 129337

参考

  1. Romanov N.V., Rasine J. Review of modern methods of strengthening and stabilizing weak foundations. Vestnik MGSU. 2018. Vol. 13. Is. 4 (115), pp. 499–513. (In Russian).
  2. Bogomolov A.N., Ponomarev A.B., Mashchenko A.V., Kuznetsova A.S. Analysis of the influence of various types of reinforcement on the deformation characteristics of clayey soil. Vestnik of VolgGASU. 2014. No. 4 (35), pp. 11. (In Russian).
  3. Mashchenko A.V., Ponomarev A.B. Analysis of changes in the strength and deformation properties of soil reinforced with geosynthetic materials at different degrees of water saturation. Vestnik Perm National Research Polytechnic university. 2014. No. 4, pp. 264–273. (In Russian).
  4. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Angelo G.O. Interaction of a crushed stone filter pile with the surrounding water-saturated clay soil and the grillage as part of a pile-slab foundation. Geotechnica. 2019. Vol. 11. No. 1, pp. 36–43. (In Russian). https:// doi.org/10.25296/2221-5514-2019-11-1-36-43
  5. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Manukyan A.V., Anzhelo G.O. Interaction of a drain pile with the surrounding compacted clay soil and grillage taking into account the time factor. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2017. No. 11, pp. 26–29. (In Russian).
  6. Sokolov N.S. One of the cases of strengthening the base of a deformed anti-landslide retaining wall. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2021. No. 12, pp. 23–27. (In Russian). https:// doi.org/10.31659/0044-4472-2021-12-23-27
  7. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Sidorov V.V. Experience in transforming weak water-saturated soils with finite-stiffness piles. Vestnik MGSU. 2018. Vol. 13. Iss. 3 (114), pp. 271–281. (In Russian).
  8. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Buslov A.S., Anzhelo G.O. Interaction of the bored sand and gravel drain pile with the surrounding compacted loam soil and foundation raft taking into account rheological properties of the loam soil and non-linear properties of the drain pile. Conference Series Materials Science and Engineering. 2018. 301, pp. 1–7. https://doi.org/10.1088/1757-899X/301/1/012139
  9. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Angelo G.O. Interaction of a crushed stone pile with the surrounding soil and grillage. Osnovaniya, fundamenty i mekhanika gruntov. 2019. No. 3, pp. 2–6. (In Russian). https://ofmg.ru/index.php/ofmg/article/view/6026
  10. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Anzhelo G.O. Interaction of a non-filtering crushed stone pile (column) with the surrounding consolidating soil and grillage as part of a pile-slab foundation Zhilishchnoe Stroitel’stvo [Housing Construction]. 2019. No. 4, pp. 19–23. (In Russian). https:// doi.org/10.31659/0044-4472-2019-4-19-23
  11. Angelo G.O. Interaction of crushed stone pile with surrounding soil and grillage (slab) under static and vibration loads. Cand. Diss. (Engineering). Moscow. 2020. 139 p. (In Russian).
  12. Lane K.S., Keene P., Kjellman W. Consolidation of fine-grained soils by drain wells. Geotechnical Special Publication. 2002. Vol. 113 (118), pp. 324–360.
  13. Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Vanina Yu.V. Long-term settlement and bearing capacity of foundations and bases near a vertical excavation with different soil viscosity parameters. Vestnik MGSU. 2023. No. 1, pp. 1664–1676. (In Russian). https://doi.org/10.22227/1997-0935.2022.12.1664-1676
  14. Maltseva T.V., Trefilina E.R., Saltanova T.V. Deformed state of the bases of buildings and structures from weak viscoelastic soils. Magazine of Civil Engineering. 2020. No. 95 (3), pp. 119–130. https:// doi.org/10.18720/MCE.95.11
  15. Ter-Martirosyan A.Z. Interaction of foundations of buildings and structures with a water-saturated base taking into account nonlinear and rheological properties of soils. Doctor Diss. (Engeeniring). Moscow. 2016. 324 p.
  16. Kulkarni K.R. Some axisymmetric problems of consolidation of multiphase clayey soils taking into account creep of their skeleton. Cand. Diss. (Engineering). Moscow. 1973. 231 p.

补充文件

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2. Fig. 1. Schematic diagram of the reduction of the water filtration path during consolidation using crushed stone drains (arrows show the directions of water movement) [10]

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3. Fig. 2. The layout in terms of crushed stone piles-drains located on the vertices of isosceles triangles [11]: 1 – crushed stone pile; 2 – сompaction zone

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4. Fig. 3. To calculate soil compaction using vertical drains: a – the scheme of the sandy drainage; b – the dependence of the degree of compaction Uz and Ur on the time factor T

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5. Fig. 4. The design scheme of the expansion of the leading well in the process of pile fabrication (a) and its expansion technology (b) [13]

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6. Fig. 5. Dispersion of excess pore pressure around the leading well with forced expansion of its radius (Uw1) and the same with slowexpansion (Uw2)

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7. Fig. 6. Curves of pore pressure dependence on radius r at different times t when solving (10) using Mathcad

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8. Fig. 7. Curves of pore pressure dependence on time t at different radii r according to the formula (28)

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9. Fig. 8. Dependence of uw(t)/pa at r=b on the logarithm of time at various n=b/a, and other parameters cr, kr

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10. Fig. 9. Dependence of U(t)/U(∞) at r=b (degree of consolidation) on the logarithm of time at various n=b/a and other parameters cr, kr

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注意

The main idea of the article belongs to Professor Ter-Martirosyan Zaven Grigorievich and is dedicated to his memory.


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