Effect of ice content and cryogenic structure of frozen ground on the bearing capacity of a pile

1978 ◽  
Vol 15 (6) ◽  
pp. 133
Keyword(s):  
Bearing Capacity ◽  
Frozen Ground ◽  
Ice Content

MONITORING THE DYNAMICS OF THERMOABRASION COASTS AT KHARASAVEY AREA, WESTERN YAMAL (KARA SEA)

2017 ◽  
Author(s):  
Dmitry Kuznetsov ◽  
Dmitry Kuznetsov ◽  
Anatoliy Kamalov ◽  
Anatoliy Kamalov ◽  
Nataliya Belova ◽  
...  
Keyword(s):  
Human Impact ◽  
Remote Sensing Data ◽  
Kara Sea ◽  
Motor Vehicles ◽  
Yamal Peninsula ◽  
Western Coast ◽  
Frozen Ground ◽  
Coastal Dynamics ◽  
The North ◽  
Ice Content

The dynamics of thermoabrasion coasts on loose sediments under permafrost conditions are highly variable due to several factors: length of the dynamic period of the year, mechanic composition of the frozen ground and its ice content, hydrometeorological conditions, and human impact. Multiannual monitoring of the coastal zone was carried out by Lab. Geoecology of the North (Moscow State University) at the 22 km long Kharasavey deposit site, Western Coast of Yamal Peninsula (Kara Sea). The methods include direct measurements and observations (repeated topographic survey of shore transects from 1981 to 2012) along with remote sensing data analysis (images from 1964 to 2011). This allowed producing detailed characteristics of coastal dynamics. At the site, thermoabrasion coasts occupy the most part, and accumulative coasts are present in the north. Data on natural relief forming factors and ground composition are included in the detailed geomorphologic map of the site. Shore retreat rate shows correlation to amounts of wind-wave energy and to specific wind directions. Human impact on the coast includes dredging at the port channel, mining of sand, driving motor vehicles, and deposition of construction debris. Relations between shore retreat rate and aforementioned factors were studied, including dependencies on ice content, and shore segmentation was carried out. This allows for coastal dynamics forecasts in the region.

Creep Parameters for Pile Settlement Equations

1989 ◽  
Vol 111 (4) ◽  
pp. 258-263
Author(s):  
D. Stelzer ◽  
O. B. Andersland
Keyword(s):  
Static Load ◽  
Experimental Tests ◽  
Sand Particle ◽  
Shear Stresses ◽  
Frozen Ground ◽  
Creep Equation ◽  
Frozen Sand ◽  
Pile Settlement ◽  
Ice Content ◽  
Friction Pile

Friction pile settlement in frozen ground is tyically predicted on the basis of a creep equation relating shear stresses at the soil/pile interface to pile displacement rates. Creep parameters are used to characterize soil type, soil/ice structure, temperature, and loading conditions. Experimental tests involving model steel piles embedded in frozen sand provided data showing that change in a given test variable can alter the numerical value for some of the creep parameters. The test variables included static, incremental, and dynamic loading; pile surface roughness; soil ice content; and sand particle size. Changes observed included the apparent effect on creep rate when a small dynamic load was superimposed on the static load. A tabulation of observed creep parameter changes is included.

Vehicle bearing capacity of frozen ground over a soft substrate

1995 ◽  
Vol 32 (3) ◽  
pp. 552-556 ◽  
Author(s):  
Sally A. Shoop
Keyword(s):  
Bearing Capacity ◽  
Maximum Load ◽  
Military Operations ◽  
Frozen Ground ◽  
Soft Substrate ◽  
Vehicle Load ◽  
Heavy Equipment ◽  
Strength Behavior ◽  
Frost Depth ◽  
Vehicle Mobility

Freezing temperatures may allow the use of vehicles and heavy equipment on otherwise inaccessible or sensitive areas such as swamps, bogs, tundra, and peatlands. Predicting operable conditions on frozen ground is useful for forestry, mining, oil exploration, construction, and military operations. Guidelines for estimating the frost depth necessary to support a given vehicle load have been generated based on experience in forestry operations on peatlands and similarities in the strength behavior of frozen peat and frozen soils. Correlation with information in the literature leads to a simple equation relating safe trafficability of frozen ground over soft ground: P = Cz2, where P is the maximum load and C is a constant depending on the strength of the frozen layer, which has a thickness z. Values for the constant C and a chart showing required frozen thickness for a variety of vehicles are given. Key words : bearing capacity, frozen ground, peat, frost, vehicle mobility, strength.

Downward water movement into frozen ground, western arctic coast, Canada

1983 ◽  
Vol 20 (1) ◽  
pp. 120-134 ◽  
Author(s):  
J. Ross Mackay
Keyword(s):  
Soviet Union ◽  
Active Layer ◽  
Water Movement ◽  
Field Studies ◽  
Frozen Ground ◽  
Thermally Induced ◽  
The Soviet Union ◽  
Field Evidence ◽  
Hydraulic Gradients ◽  
Ice Content

Field studies carried out mainly since 1975 in permafrost areas of Alaska, Canada, China, and the Soviet Union have been combined with the results of laboratory investigations to show that in summer water can move from the thawing active layer into the subjacent frozen active layer and under certain conditions even into the top of permafrost. Direct field evidence discussed includes: data from drilling and neutron probe logging, which show a summer increase in the ice content of already frozen ground; summer heave of heavemeters, with heave occurring in the frozen active layer; and increase in the ice content of the subjacent frozen ground in both permafrost and non-permafrost areas, caused by snowmelt infiltration. Indirect field and laboratory evidence is also added to support the direct lines of evidence. The conditions that favor the downward migration of water from thawed to frozen ground are examined in terms of thermally induced hydraulic gradients, hydraulic conductivity, content of unfrozen pore water, temperature gradients, ice content, and gravity. Some geocryologic implications of the summer growth of ice in frozen ground, including the effects on water balance calculations and the origin of patterned ground, are briefly mentioned.

Cryostructures in permafrost, Tuktoyaktuk coastlands, western arctic Canada

1994 ◽  
Vol 31 (4) ◽  
pp. 737-747 ◽  
Author(s):  
Julian B. Murton ◽  
Hugh M. French
Keyword(s):  
Grain Size ◽  
Arctic Canada ◽  
Frozen Ground ◽  
Western Arctic ◽  
Ice Content

The shape and distribution of ice and sediment within frozen ground constitute its cryostructure. Observations on perennially frozen sediments in the Tuktoyaktuk coastlands enable six cryostructures to be identified: (1) structureless, (2) lenticular, (3) layered, (4) reticulate, (5) crustal, and (6) suspended. These cryostructures can be transitional or composite. Five cryofacies types can also be identified according to volumetric ice content and grain size. They can be grouped into cryofacies assemblages. The utility of the descriptive classification of ice-rich sediments is illustrated from a palaeothaw layer at Crumbling Point.

scholarly journals Analysis of Necessity and Feasibility for Ground Improvement in Warm and Ice-Rich Permafrost Regions

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Honglei Wang ◽  
Hu Zhang ◽  
Mingtang Chai ◽  
Jianming Zhang ◽  
Zhizhong Sun ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Ground Improvement ◽  
Frozen Soil ◽  
Chemical Stabilization ◽  
Alternative Measure ◽  
Frozen Ground ◽  
Foundation Soil ◽  
The Stability ◽  
Permafrost Regions

Characterized by low bearing capacity and high compressibility, warm and ice-rich frozen soil is a kind of problematic soil, which makes the original frozen ground formed by of that unreliable to meet the stability requirements of engineering infrastructures and foundations in permafrost regions. With the design and construction of major projects along the Qinghai-Tibet Engineering Corridor (QTEC), such as expressway and airport runway, it is a great challenge to favor the stability of overlying structures by formulating the proper engineering design principles and developing the valid engineering supporting techniques. The investigations carried out in recent years indicated that warm and ice-rich permafrost foundations were widespread, climate warming was significant, and the stability of existing engineering structures was poor, along the QTEC. When the warm and ice-rich frozen ground is used as the foundation soil, the implementation of ground improvement is an alternative measure to enhance the bearing capacity of foundation soil and eliminate the settlement of structures during operation, in order to guarantee the long-term stability of the structures. Based on the key factors determining the physicomechanical properties of frozen soil, an innovative idea of stabilizing the warm and ice-rich frozen soil based on chemical stabilization is proposed in this study, and then, an in situ ground improvement technique is introduced. This study intends to explore the feasibility of ground improvement in warm and ice-rich permafrost regions along the QTEC based on in situ chemical stabilization and provide the technical support and scientific reference to prevent and mitigate the hazards in the construction of major projects in the future.

Landforms and ground ice as evidence of the source of H2O in permafrost

1989 ◽  
Vol 13 (3) ◽  
pp. 367-390 ◽  
Author(s):  
Stuart A. Harris
Keyword(s):  
Frozen Ground ◽  
Secondary Importance ◽  
Glacial Ice ◽  
Initial Formation ◽  
Ice Accumulation ◽  
Potential Sources ◽  
Rock Glaciers ◽  
Slope Rock ◽  
Ice Content ◽  
Peat Plateaus

Selected landforms and the ice in permafrost may be used as indicators of the direction of moisture input into perennially frozen ground. Accumulation of ice from meteoric sources from above may be the most widespread process, being dominant in the palsas, peat plateaus, and near-slope rock glaciers studied so far. It is also the main source of ice accumulation in permafrost. Pingos and seasonal frost mounds are the result of injection of ground water from below. The resulting ice content usually exceeds 90% by volume and some massive icy beds in Arctic Canada may also form in this way. Glacial ice is also proven as a source for some massive icy beds and may represent an Arctic form of ice stagnation. Segregation of ice by water moving to the freezing plane is very important in active layer processes and the initial formation of peat plateaus and palsas, but is probably of secondary importance thereafter. More work is needed to confirm these relationships and to prove the origin of near-glacier rock glaciers. However, if these relationships prove reliable, then the landforms can be used as indicators of potential sources of ice so that foundation designs can be modified to minimize heaving problems.

Degenerative Permafrost Engineering Geology Features Analysis and Forecasting of National Road 214

2011 ◽  
Vol 105-107 ◽  
pp. 1460-1464
Author(s):  
Ping De Liu ◽  
Shuang Jie Wang ◽  
Cai Qin Wang ◽  
Long Jin
Keyword(s):  
High Speed ◽  
Engineering Geology ◽  
Meteorological Data ◽  
Ground Temperature ◽  
Frozen Ground ◽  
Southern Limit ◽  
The Road ◽  
Permafrost Table ◽  
Ice Content ◽  
National Road

The paper is based on information of permafrost engineering geology of National Road 214, and for a comparative, analysis the permafrost engineering geology features of National Road 214, Including permafrost ground temperature, ice content, natural permafrost table and artificial permafrost table; Then Summary the distribution of permafrost of National Road 214, including Southern limit of permafrost and Northern limit of permafrost, Then get one conclusion; Because of the outside temperature increase and under the influence of the role of the project, frozen ground temperature has rise trends, The permafrost along the road all tended to degenerate, Then summary its degeneration features of National Road 214, and analyze the reasons of the final degeneration; Final, combining the high-speed reconnaissance and design project National Road 214, Analysis the permafrost existing meteorological data and geological survey data, according to the frozen ice content and permafrost thickness, Then to predict and analysis permafrost degeneration tendency in numerical simulation.

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