Structural safety of buildings in excess values of differential settlements

Pronozin, Yakov; Epifantseva, Larisa; Kajgorodov, M D

doi:10.1088/1757-899x/481/1/012013

Cited by 5 publications

(5 citation statements)

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“…During operation of the building to be restored, reconstructed or repaired, it is possible to change the hydrogeological situation within the core area of the soil bed. For example, extra moistening leads to deterioration of the physical and mechanical properties of soils; the strength of the bed decreases and its deformability increases (Shamsi et al 2019 [10], Lee et al 2018 [11], Ihsan and Toma Sabbagh 2017 [12], Rabiei and Choobbasti 2015 [13], Pronozin et al 2018, 2019 [14,1]).…”

Section: Changed Properties Of Foundation Soilsmentioning

confidence: 99%

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Laboratory Investigation on Interaction of the Pile Foundation Strengthening System with the Rebuilt Solid Pile-Slab Foundation

et al. 2020

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The article presents the results of laboratory studies of pile model foundations in order to determine the effectiveness of the method proposed by the authors for its reconstruction in pile-tile foundation with preliminary pressing and cementation of the soil base. The studies were carried out on small-scale wooden models of foundations in the conditions of a soil paste. The models of foundations were subjected to vertical static loading in a laboratory tray with a diametrical transparent wall. The program of experiments was provided for determination of precipitation of the models: pile foundations without strengthening, with strengthening in the form of reconstruction from the combined foundation and with strengthening in the form of reconstruction into the combined foundation with preliminary stress of the soil base in the span part. Vertical and horizontal movements in the soil mass were also recorded by a contactless method (PIV) in every stage of model loading. On the basis of experimental measurements digital processing of data of sediments and displacements is performed, for drawing plots of sediments, epures and isolines of displacements in the soil base. The main result of the research is confirmation of the high efficiency of the proposed method of strengthening pile foundations due to the maximum use of pre-pressed soil base resources in spans between pile rows. It has been found that compression (pre-stress) significantly reduces soil deformability and allows to include it in operation without additional deformations. The use of pre-compaction reduced the precipitation of the model combined foundation by almost 40%, relative to the combined without compaction. The results of the research open the possibility to develop new methods of strengthening pile foundations from the point of view of effective inclusion in the operation of the soil base in the span part, due to its preliminary tension.

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Section: Changed Properties Of Foundation Soilsmentioning

confidence: 99%

“…It is necessary to enumerate the main reasons which cause the need to strengthen the foundations and harden the foundation soils. The following classification is used in this research [1], Utenov et al 2017 [2], Khomyakov et al 2017 [3]):…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Interaction of the Pile Foundation Strengthening System with the Rebuilt Solid Pile-Slab Foundation

et al. 2020

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“…In turn, many cases are known in construction practice, as a result of which emergency situations were observed at construction sites during the installation of artificial foundations of this type [1]. The main factors leading to these consequences are the wrong choice of material for backfilling, as well as violation of the technology of work [2,3]. As examples of incorrect selection of material for backfilling, there are cases of using subsidence soils prone to significant compaction under load, technogenic soils with a heterogeneous composition, etc.…”

Section: Introductionmentioning

confidence: 99%

Experience of strengthening the soil base with parallel lifting of the foundation structure

Rachkov

Volosyuk²,

Pronozin³

et al. 2023

E3S Web Conf.

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The article shows the positive experience of fixing the soil base and strengthening the foundation with the parallel restoration of the normative state of the underground and above-ground structures of the facility. The accidents at the considered objects is caused by the formation of significant voids under the foundation. Foundations at the objects are represented by monolithic reinforced concrete slab and strip. Recommendations are given on the development of design solutions, organization of work, and the compositions of injection mortars are analyzed. Injection compositions were presented on the basis of cement and sand-cement mixture, the argumentation of the use of these compositions on specific engineering-geological conditions is given. Stabilization of the foundation was additionally made by strengthening with "Atlant" piles. The variants of the object geometric position correction by mortar injection into the contact layer and into the active soil strata are presented. The development of a reliable solution for reinforcement is possible only if there are an accurate data of the geotechnical conditions of the construction site, a detailed visual and instrumental survey of building structures. The processes of fixing soil foundations with parallel lifting of underground and above-ground structures are provided today with the necessary level of equipment development. However, it is necessary to ensure its technologically correct use, adapted to a specific situation. The options for solving emergency situations considered in the article can be used as proven design solutions at facilities with similar engineering and geological conditions and foundation structures.

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“…At the same time, it is often assumed that unsuitable soil is excavated from the base and replaced with stronger, less compressible soils (often sandy), but any violation of the work technology (insufficient compaction of the backfill soil, non-compliance with the size of the soil fraction, the inclusion of frozen fractions, abundant soaking during the work, etc.) leads to a deterioration of the physical and mechanical characteristics of the soil of the filled artificial bases laid down by the project, which is usually detected already during operation, and it requires their further operational strengthening [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…), construction in difficult ground conditions, use as anchor fasteners, etc. Currently one of the best methods for CFA piles is a German technology such as "Titan" [11], domestic analog <Atlant= [12,13], and "Normal" [6,7] based on the use as the core of a pile of rods of high-strength hollow tubes connected by joints, which provide high strength and tightness of the connection.…”

Section: Introductionmentioning

confidence: 99%

Experience in strengthening foundations and foundations on technogenic soils

2022

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The article discusses modern methods of strengthening foundations on artificial bases that have received excessive precipitation and rolls. In the course of studies, it was found that the use of bored piles allows transferring the load to the underlying reliable foundation at any depth, and cementing the foundation soil contributes to improving the physical and mechanical characteristics of the backfill soil.

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Structural safety of buildings in excess values of differential settlements

Cited by 5 publications

References 1 publication

Laboratory Investigation on Interaction of the Pile Foundation Strengthening System with the Rebuilt Solid Pile-Slab Foundation

Laboratory Investigation on Interaction of the Pile Foundation Strengthening System with the Rebuilt Solid Pile-Slab Foundation

Experience of strengthening the soil base with parallel lifting of the foundation structure

Experience in strengthening foundations and foundations on technogenic soils

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