SIMULATION OF THE SOIL BASE OF A BUILDING FOUNDATION NEAR A DEEP PIT

АУТОР(И) / AUTHOR(S): Ilizar Mirsayapov, Niyaz Aysin

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DOI:  10.46793/ACUUS2025.2.17.75

САЖЕТАК / ABSTRACT:

The densification of urban development necessitates the construction of buildings with a developed underground volume. In this process, existing building foundations are often located at the edge of deep excavations. The task of assessing the impact of constructing deep foundations on surrounding structures is important and relevant. An analysis has been conducted based on data from foundation settlements near the edges of deep excavations using numerical modeling results and geotechnical monitoring studies by Russian and foreign authors. To evaluate additional settlement of building foundations near deep excavations, research was carried out to study the stress-strain state of the ground near a deep excavation in a laboratory model created in a flat tank with transparent walls. Displacement values were recorded using video recording and electronic sensors, then processed. The experimental results correlate well with those obtained by other researchers. A pattern for distribution of horizontal stresses and displacements beyond the boundaries of the deep excavation model has been established. Based on these findings, a method for calculating foundation settlements near deep excavations considering changes in the stress-strain state of the surrounding soil mass has been proposed. Based on the research results, it has been found that there is an uneven change in the stress-strain state of soils under building foundations along the edges of excavations. Deformation of the soil mass beneath the foundations of buildings located within the collapse prism occurs non-linearly and unevenly. Construction of deep excavations leads to changes in the stress-strain state of the soil mass supporting foundations situated at the edge of the excavation. This causes changes in the ratio between vertical and horizontal stresses, resulting in altered deformation characteristics of the soil and consequently increased settlement.

КЉУЧНЕ РЕЧИ / KEYWORDS:

Numerical simulation, Geotechnical monitoring, Soil mechanics, Deep pit, Clay soil

ПРОЈЕКАТ / ACKNOWLEDGEMENT:

ЛИТЕРАТУРА / REFERENCES:

• Dong, Y., Burd, H., & Houlsby, G. (2018). Finite element parametric study of the performance of a deep excavation. Soils and Foundations(58), 729-743. doi:10.1016/j.sandf.2018.03.006
• Ilyichev, V. A., Mangushev, R. A., & Nikiforova, N. S. (2012). Experience in the development of underground space in Russian megacities. Soil Mechanics and Foundation Engineering, 15-17.
• Jiang, X., Lu, Q., Chen, X., Liu, J., & Li, P. (2021). Numerical Analysis of Deep Foundation Pit Excavation Process. IOP Conf. Series: Earth and Environmental Science(719), 032051. doi:10.1088/1755-1315/719/3/032051
• Mangushev , R. A., Ilyichev, V. A., Nikiforova, N. S., & Sapin, D. A. (2016). Construction and design of pits. Handbook of geotechnics, 675-758.
• Mirsayapov, I. T., & Aysin, N. N. (2021). Evaluation of Subgrade Vertical Deformations of the Building with the Influence of a Deep Pit. Lecture Notes in Civil Engineering(126), 51-58. doi:10.1007/978-3-030-64518-2_7
• Nikiforova, N. S. (2010). Adjustment of the method for calculating settlements of buildings during underground construction based on experimental studies. Vestnik MGSU(4), 293-300.
• Nikiforova, N. S., & Vnukov, D. A. (2011). rotection of buildings near deep pits with geotechnical screens. Vestnik MGSU(5), 108–112.
• Nikiforova, N. S., Konovalov, P. A., & Zekhniev, F. F. (2010). Geotechnical problems in the construction of unique objects. Soil Mechanics and Foundation Engineering, 2-8.
• Shishkin, V. Y., Pogorelov, A. E., & Makeev, V. A. (2011). Strengthening existing buildings during the construction of a building with a foundation pit of 18–20 m. Housing Construction, 32–38.
• Ter-Martirosyan, Z. G., Ter-Martirosyan, A. Z., & Vanina, Y. V. (2022). Settlement and bearing capacity of bases and foundations near a vertical excavation. Vestnik MGSU, 17(4), 443-453. doi:10.22227/1997-0935.2022.4.443-453
• Zertsalov , M. G., & Kazachenko, S. A. (2021). Numerical-analytical method for engineering assessment of the influence of pit development on the movements of the adjacent soil mass, taking into account the rigidity of the enclosing structure. Mechanics of composite materials and structures(27), 396-409. doi:10.33113/MKMK.RAS.2021.27.03.396_409.07