Application of pile foundations in structurally unstable soils

Alekseev, Alexey; Sazonov, P. M.; Zorin, Dmitry; Виноградова, С. С.

doi:10.1051/matecconf/201926505020

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…It is necessary to identify areas and regions that in the future will be most susceptible to the process of permafrost degradation and associated risks for existing buildings and structures, which require considering climate warming in the forecast estimates when calculating frozen bases for the entire period of construction and operation of new buildings. The study of changes in soil temperature (including under buildings, considering their thermal influence) for the Taimyr district using various climate models, including CMIP5, is given in the article by Alekseev A. G. & Zorin D. V. [2].…”

Section: Trends Of Climate Change In the XXI Centurymentioning

confidence: 99%

Changes in temperature regime of soil in cryolithozone considering climate warming

Ilyichev

Nikiforova²,

Konnov³

2023

E3S Web Conf.

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The current climate change in Russia is characterized as continuing warming. There is an increase of the deformity and accident rate for buildings located in the cryolithozone. It is necessary to identify regions that in the future will be most susceptible to the permafrost degradation and associated risks for existing buildings and structures, which require considering climate warming in the forecast estimates. The purpose of this study was to assess the impact of climate warming on the temperature regime of the soils of the Norilsk district. Numerical modeling of the temperature variation of soil considering air temperature increase according to the regional climate model of the Voeikov MGO on 60 years showed temperature rise of permafrost, lowering its top and increasing the thickness of the seasonally thawed layer. The warming of the climate in the area will have a significant impact on the temperature regime of the soil and will lead to a violation of the operational suitability of existing buildings and structures. In the Norilsk region climate warming should be regarded as a significant accident occurrence factor, which should be considered when calculating the bases in the cryolithozone for the entire period of construction and operation of facilities.

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Section: Trends Of Climate Change In the XXI Centurymentioning

confidence: 99%

Changes in temperature regime of soil in cryolithozone considering climate warming

Ilyichev

Nikiforova²,

Konnov³

2023

E3S Web Conf.

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“…Therefore, pore water in the mortar remains unfrozen and is spent for its further hydration. Mortar is known [33,34] to hold positive temperature for at least one day (up to two or three days, according to different estimates). For this reason, the samples were kept at positive temperatures of 20 to 25 • C for 24 h, then frozen to −15 to −20 • C for mortar-pile adfreezing and then exposed to the specified run temperatures.…”

Section: Samples Preparationmentioning

confidence: 99%

Reline Jacket: Efficient Reduction of Frost-Heave Uplift of Piles in Warming Permafrost

Alyavdin¹,

Belyakov²,

Levin³

et al. 2022

Geosciences

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Air temperature in the Northern Hemisphere has been progressively warming in the recent decades, and the ground temperatures have increased correspondingly. The air temperature increasing due to the climate change induces degradation of permafrost and frost heaving activation. The frost heaving forces cause unevenly distributed damaging displacement of foundations and thus poses problems to the development of Arctic regions. Frost-heave uplift forces can be reduced by protecting piles with an OSPTReline (or Reline) polymer heat-shrinkable jacket. The interaction of heaving soil with a pile covered with the Reline jacket is modeled in laboratory to estimate the uplift force and the related shear strength of frozen soil along the soil-pile adfreeze surface at temperatures from −6 to −1 °C. The data are obtained for silty sand and silty clay soils and mortar (1:5 cement-sand mixture). The experiments show that frost-heave uplift forces on Reline-protected piles are 52% to 85% lower than on uncovered steel piles (steel grade 09G2S—analog to European steel grade S355JR), depending on soil type and temperature.

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The bridge piers sagging problem under permafrost subbase degradation conditions and the possible solution

Tomilov

Sim

Grinev

2020

Russian journal of transport engineering

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Permafrost soils are common for extensive areas of our country and when building engineering structures in such conditions, it is necessary to take into account the factor supporting subbase on the permafrost soil, which may initially have high stress-related characteristics. But the permafrost degradation phenomenon with frost retreat no less common. It can be happening both for natural reasons due to global warming, and for man-made reasons, when interference during construction and further the structure itself initiates subsoil frost retreat. For the most part, permafrost soils lose their strength and elastic properties during the frost retreat, turning into an almost liquid consistency, which entails the failure of the supports in the bearing capability and position stability. With the road network development and the bridge’s construction in the northern regions at the end of the 60s — early 70s of the XX century, the first principle of the design was widely applied. It was for use and maintenance of the subsoil in a frozen state, which means not require a deep foundation required. However, after 20 — 30 years of operation, cases of unexpected and significant bridge piers sagging began to be noted, as it turned out, was the result of permafrost soils frost retreat to the entire depth of the foundation. It was also noted that in some cases the bridge piers sagging is preceded by its frost boil phenomena, which appear shortly before piers sinking and almost complete failure. In this article case of an unexpected bridge piers failure examined on a specific bridge. After 30 years of proper functioning, pierces received such significant sagging, so in just three years that got to the point when it’s not only traffic safety but the cohesiveness of the entire structure. And before that, a frost boil was noted at some of the bridge pierce. The purpose of this study is to analyze the frost boil mechanism and sagging of the bridge pierce’ foundations due to the progressive permafrost degradation and to suggest restoring and maintaining ways for pierces’ operation capacity. Overall, the reasons and principles of permafrost subbase degradation were analyzed in this paper. through calculations using a specific example, significant sagging and bridge pierce bearing capability loss observations were justified and substantiated the effectiveness of the proposed in this article structural reinforcement measures.

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Application of pile foundations in structurally unstable soils

Cited by 3 publications

References 1 publication

Changes in temperature regime of soil in cryolithozone considering climate warming

Changes in temperature regime of soil in cryolithozone considering climate warming

Reline Jacket: Efficient Reduction of Frost-Heave Uplift of Piles in Warming Permafrost

The bridge piers sagging problem under permafrost subbase degradation conditions and the possible solution

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