Formation of the supporting zone round a pile driven into thawed permafrost ground

1965 ◽  
Vol 2 (2) ◽  
pp. 87-91 ◽  
Author(s):  
Yu. M. Goncharov
Keyword(s):  
Permafrost Ground ◽  
Supporting Zone

Carrying load of column poles of railway bridges that are designed according the I-st principle on permafrost ground

2021 ◽  
pp. 68-74
Author(s):  
Yaroslav Alexeevich Shvets ◽  
◽  
Alexander Yuryevich Zhuravlev ◽  
Keyword(s):  
Mathematical Modeling ◽  
Thermal Mode ◽  
Railway Bridges ◽  
Permafrost Ground

The paper presents results of development of a method for determination of carrying load of column poles of railway bridges that are based on permafrost ground and designed according the I-st principle. It also shows the necessity to use methods of mathematical modeling for determination of thermal mode of permafrost ground in the foundation of artificial constructions, which will allow forecasting the carrying load of bridge poles for any term of operation. As a result, the paper shows an algorithm for calculation and forecasting of carrying load of bridge poles at degradation of permafrost in their foundation.

scholarly journals Radon Hazard In Permafrost Conditions: Current State Of Research

2019 ◽  
Author(s):  
Andrey V. Puchkov ◽  
Evgeny Yu. Yakovlev ◽  
Nicholas Hasson ◽  
Guilherme A. N. Sobrinho ◽  
Yuliana V. Tsykareva ◽  
...  
Keyword(s):  
Natural Radionuclides ◽  
Ground Subsidence ◽  
Near Surface ◽  
Radon Exposure ◽  
Current State ◽  
Permafrost Soils ◽  
Permafrost Ground ◽  
Survey Results ◽  
Thawing Permafrost ◽  
State Of Research

In this paper, we review both practical and theoretical assessments for evaluating radon geohazards from permafrost landforms in northern environments (>60º N). Here, we show that polar amplification (i.e. climate change) leads to the development of thawing permafrost, ground subsidence, and thawed conduits (i.e. Taliks), which allow radon migration from the subsurface to near surface environment. Based on these survey results, we conjecture that abruptly thawing permafrost soils will allow radon migration to the near surface, and likely impacting human settlements located here. We analyze potential geohazards associated with elevated ground concentrations of natural radionuclides. From these results, we apply the main existing legislation governing the control of radon parameters in the design, construction and use of buildings, as well as existing technologies for assessing the radon hazard. We found that at present, these laws do not consider our findings, namely, that increasing supply of radon to the surface during thawing of permafrost will enhance radon exposure, thereby, changing prior assumptions from which the initial legislation was determined. Hence, the legislation will likely need to respond and reconsider risk assessments of public health in relation to radon exposure. We discuss the prospects for developing radon geohazard monitoring, methodical approaches, and share recommendations based on the current state of research in permafrost effected environments. 

scholarly journals Calculation methods of non-stationary temperature fields influence on foundation in cryolithozone

2020 ◽  
pp. 106-125
Author(s):  
Nikolay Ivanovich Sidnyaev ◽  
Vasilii Ivanovich Vasiliev ◽  
Yuliya Sergeevna Ilina
Keyword(s):  
Vertical Structure ◽  
Stationary Process ◽  
Temperature Fields ◽  
The Arctic ◽  
Permafrost Soil ◽  
Design Decisions ◽  
Thermal Calculations ◽  
Permafrost Ground ◽  
The Stability ◽  
The One

  This article is devoted to the mathematical modeling and computing experiment in problems of temperature fields forecast in continuous foundations in cryolithozone, which will provide a qualitative approach to non-stationary thermal calculations for making design decisions to ensure the stability and reliability of bases and foundations of buildings in the Arctic zone.  The article formulates the problem of forecasting by determining changes in the temperature, areal distribution, thickness, and vertical structure of permafrost, seasonal and perennial freezing of the soil, their temperature strength state, and properties in connection with the construction of buildings. Presented mathematical calculations are based mainly on the assumption of a non-stationary process of heat exchange. Mathematical models for determining depth of thawing are considered. The problem of determining the temperature in the basement of the foundation, limited on the one side, in which the temperature depends on only one coordinate with the condition that the surface temperature of the permafrost soil undergoes periodic fluctuations around zero value under the influence of external influences, has been solved. It is demonstrated that the two-dimensional problem of permafrost ground with a semi-infinite foundation thickness can be generalized even more. The problem is formulated in the form of a differential equation of heat balance taking into account the heat flux, which varies according to the Fourier’s law.  

scholarly journals The glacial origins of relict ‘pingos’, Wales, UK

2019 ◽  
Vol 60 (80) ◽  
pp. 138-150
Author(s):  
Neil Ross ◽  
Peter Brabham ◽  
Charles Harris
Keyword(s):  
Alternative Explanation ◽  
Ice Sheets ◽  
Irish Sea ◽  
Glacial Cycle ◽  
Mechanisms Of Formation ◽  
Glacier Ice ◽  
Permafrost Ground ◽  
The Irish Sea ◽  
Alternative Processes ◽  
The Last Glacial

AbstractRamparted depressions (doughnut-shaped debris-cored ridges with peat- and/or sediment-filled central basins) are commonly perceived to represent the relict collapsed forms of permafrost ground-ice mounds (i.e. pingos or lithalsas). In Wales, UK, ramparted depressions of Late Pleistocene age have been widely attributed to permafrost-related processes. However, a variety of alternative glacial origins for these enigmatic landforms are also consistent with the available geological and geomorphological evidence, although previous studies have barely considered such alternative processes of formation. From detailed geophysical, sedimentological and remote-sensing studies at two field sites, we demonstrate that: (i) the wastage of stagnating glacier ice is a viable alternative explanation for the formation of ramparted depressions in Wales; (ii) the glacial geomorphology and geology of these landforms is analogous to supraglacial and subglacial landforms from the last Laurentide and Fennoscandian ice sheets; (iii) these landforms have significant potential for characterising the nature of deglaciation around the margins of the Irish Sea during the last glacial cycle, and may record evidence for the overextension and stagnation of the south-eastern margin of the Irish Sea Ice Stream; and (iv) investigations of ramparted depressions within formerly glaciated terrains must consider both glacial and periglacial mechanisms of formation.

scholarly journals Microbial diversity and activity through a permafrost/ground ice core profile from the Canadian high Arctic

2008 ◽  
Vol 10 (12) ◽  
pp. 3388-3403 ◽  
Author(s):  
Blaire Steven ◽  
Wayne H. Pollard ◽  
Charles W. Greer ◽  
Lyle G. Whyte
Keyword(s):  
Microbial Diversity ◽  
Ice Core ◽  
High Arctic ◽  
Canadian High Arctic ◽  
Ground Ice ◽  
Core Profile ◽  
Permafrost Ground

Changes in Head Position Due to Occlusal Supporting Zone Loss During Clenching

CRANIO® ◽  
2003 ◽  
Vol 21 (2) ◽  
pp. 89-98 ◽  
Author(s):  
Gengo Yoshino ◽  
Kazuo Higashi ◽  
Takashi Nakamura
Keyword(s):  
Head Position ◽  
Supporting Zone
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