Discussion on Moisture Migration and Law of Frost Heave of Seasonal Frozen Soil in Hetao Irrigation Area, Inner Mongolia

2012 ◽  
Vol 212-213 ◽  
pp. 260-263
Author(s):  
Ying Hao Wang ◽  
Shuo Li
Keyword(s):  
Inner Mongolia ◽  
Frozen Soil ◽  
Frost Heave ◽  
Moisture Migration ◽  
Irrigation Area ◽  
Irrigation Channel ◽  
Thaw Cycle ◽  
Channel Engineering ◽  
Seasonal Frozen Soil ◽  
Hetao Irrigation Area

Hetao irrigation area in Inner Mongolia is one of the four major irrigation areas in China, seasonal frozen soil is widely distributed in this area. Irrigation channel engineering experiences seriously freeze-thaw cycle many times in the long winter, its maintenance is the important and difficult point all long in irrigation channel engineering of Hetao irrigation area. For this, we analyze the moisture migration and law of frost heave characteristics of seasonal frozen soil in Hetao irrigation area.

scholarly journals A Study of the Insulation Mechanism and Anti-Frost Heave Effects of Polystyrene Boards in Seasonal Frozen Soil

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 979 ◽  
Author(s):  
Fuqiang Guo ◽  
Haibin Shi ◽  
Manjin Cheng ◽  
Wenhui Gao ◽  
Hongzhi Yang ◽  
...  
Keyword(s):  
Precast Concrete ◽  
Reduction Rate ◽  
Frozen Soil ◽  
Frost Heave ◽  
Test Field ◽  
Frost Heaving ◽  
Irrigation Area ◽  
Ground Temperatures ◽  
Seasonal Frozen Soil ◽  
Hetao Irrigation Area

The damages resulting from frost heaving are the main causes of channel destruction in seasonal frozen soil regions. Over the years, many experimental studies have been performed regarding the channel anti-frost heaving in the Hetao irrigation area. However, there have been few experimental research studies conducted regarding the insulation and anti-frost heave effects of polystyrene boards (EPS) of different thicknesses. Therefore, in order to explore the insulation mechanism and anti-frost heave effects of precast EPS laid under the conditions of different thicknesses, an anti-frost heave test field was established in the Hetao irrigation area for the examination of the ground temperatures, frozen depths, frost heave amounts, and water content change rules. This study’s results showed that, for the laid EPS with thicknesses between 2 and 12 cm, the frost-heave reduction rate ranged from 53.2% to 92.6%; total accumulated temperature warming ranged from 248.65% to 565.93%; and the frozen depth reduction rate was between 59.8% and 75.9%. It was determined that the EPS per cm additions could effectively improve the ground temperatures at a buried depth of 30 cm by 0.78 °C, and reduce the frozen depth by 10.1 cm. Then, by comprehensively considering the positive economic and insulation effects, it was determined that the most appropriate thickness of the EPS laid under the precast concrete slabs in the Hetao irrigation area of Inner Mongolia was 8–10 cm.

Mechanics of Buried Chilled Gas Pipelines

1996 ◽  
Author(s):  
A. P. S. Selvadurai ◽  
J. Hu
Keyword(s):  
Three Dimensional ◽  
Frozen Soil ◽  
Frost Heave ◽  
Elastic Behaviour ◽  
Full Scale Test ◽  
Flexural Behaviour ◽  
Moisture Migration ◽  
Factors Influencing ◽  
Scale Test ◽  
Interaction Test

This paper examines the factors influencing the modelling of soil-pipeline interaction for a pipeline which is used to transport chilled gas. The soil-pipeline interaction is induced by the generation of discontinuous frost heave at a boundary between soils with differing frost susceptibility. The three-dimensional modelling takes into consideration the time-dependent evolution of frost heave due to moisture migration, the creep and elastic behaviour of the frozen soil and flexural behaviour of the embedded pipeline. The results of the computational model are compared with experimental results obtained from the frost heave induced soil-pipeline interaction test performed at the full scale test facilities in Caen, France.

scholarly journals Comprehensive Assessment of Water Quality and Pollution Source Apportionment in Wuliangsuhai Lake, Inner Mongolia, China

2020 ◽  
Vol 17 (14) ◽  
pp. 5054 ◽  
Author(s):  
Rui Shi ◽  
Jixin Zhao ◽  
Wei Shi ◽  
Shuai Song ◽  
Chenchen Wang
Keyword(s):  
Water Quality ◽  
Inner Mongolia ◽  
Principal Component ◽  
Middle Part ◽  
Quality Data ◽  
Quality Factors ◽  
Water Quality Data ◽  
Irrigation Area ◽  
Irrigation Period ◽  
Hetao Irrigation Area

Water quality is a key indicator of human health. Wuliangsuhai Lake plays an important role in maintaining the ecological balance of the region, protecting the local species diversity and maintaining agricultural development. However, it is also facing a greater risk of water quality deterioration. The 24 water quality factors that this study focused on were analyzed in water samples collected during the irrigation period and non-irrigation period from 19 different sites in Wuliangsuhai Lake, Inner Mongolia, China. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) were conducted to evaluate complex water quality data and to explore the sources of pollution. The results showed that, during the irrigation period, sites in the middle part of the lake (clusters 1 and 3) had higher pollution levels due to receiving most of the agricultural and some industrial wastewater from the Hetao irrigation area. During the non-irrigation period, the distribution of the comprehensive pollution index was the opposite of that seen during the irrigation period, and the degree of pollutant index was reduced significantly. Thus, run-off from the Hetao irrigation area is likely to be the main source of pollution.

scholarly journals Seeds dormancy and germination behavior of three submerged macrophytes in the Hetao Irrigation area of the Inner Mongolia,China

2013 ◽  
Vol 25 (1) ◽  
pp. 115-118 ◽  
Author(s):  
WANG Xuan ◽  
◽  
LI Qingfeng ◽  
HU Yang ◽  
JIA Hongmei ◽  
...  
Keyword(s):  
Inner Mongolia ◽  
Submerged Macrophytes ◽  
Irrigation Area ◽  
Hetao Irrigation Area

scholarly journals Analysis of main points of channel freezing-thawing disease in cold region and influence of channel base soil on the disease

2021 ◽  
Vol 329 ◽  
pp. 01090
Author(s):  
Liqing Liang
Keyword(s):  
North China ◽  
Hydraulic Structure ◽  
Research Direction ◽  
Frozen Soil ◽  
Frost Heave ◽  
Cold Region ◽  
Freezing And Thawing ◽  
Cold Regions ◽  
Seasonal Frozen Soil ◽  
Base Soil

The frozen soil area in China is more than two thirds of the total territory, so the problem of frost heave is obvious. Especially in northeast, northwest, north China and other cold regions, the problem of frost heave of hydraulic structures is very common. Canal is a common hydraulic structure in agricultural water, which is affected by seasonal frozen soil and may cause problems such as lining damage, seepage and irrigation efficiency. Therefore, this paper mainly summarizes the necessity of research on channel freezingthawing damage, the research direction of channel freezing-thawing damage, and expounds the influence of seasonal frozen soil on freezing and thawing diseases in cold regions by taking the particle size of saturated soil based on channel as an example.

Observations of soil freezing and frost heave at Inuvik, Northwest Territories, Canada

1985 ◽  
Vol 22 (2) ◽  
pp. 283-290 ◽  
Author(s):  
M. W. Smith
Keyword(s):  
Northwest Territories ◽  
Field Data ◽  
Negative Temperature ◽  
Frozen Soil ◽  
Soil Freezing ◽  
Frost Heave ◽  
Moisture Regime ◽  
Silty Clay ◽  
Field Observations ◽  
Moisture Migration

Field observations of soil temperature, moisture regime, and frost heave in silty clay hummocks at Inuvik, Northwest Territories, over the fall and early winter reveal that a significant amount of moisture migration and frost heave occurs within frozen soil at temperatures down to −2.4°C. The field data are analysed using thermodynamic considerations, and the apparent hydraulic conductivity is determined as a function of negative temperature. The conductivity falls from near 7 × 10−9 m s−1 above 0 °C to about 3.5 × 10−12 m s−1 at −1 °C, then remains fairly constant down to −2.4 °C. The observed decrease in heave with time is explained in terms of a diminishing water supply at the base of the active layer.

Modeling soil freeze-thaw and ice effect on canal bank

1998 ◽  
Vol 35 (4) ◽  
pp. 655-665 ◽  
Author(s):  
Z X Zhang ◽  
R L Kushwaha
Keyword(s):  
Frozen Soil ◽  
Soil Freezing ◽  
Frost Heave ◽  
Energy Status ◽  
Abrupt Increase ◽  
Water Ice ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Initial Soil ◽  
Freeze Thaw Cycle

The experiments for modeling soil freeze-thaw and ice action on canal banks were conducted in a laboratory. In addition to the frost heave that was observed during the period of soil freezing, there was an abrupt increase in frost heave that occurred at the beginning of soil thawing. This phenomenon lasted for over approximately 100 hours, and the frost heave induced during this period reached as much as 22.62 mm. At the same time, peak ice pressures also occurred as the soil was thawing. It has been suggested that the frost heave during initial soil thawing may be associated with the change in energy status at the water-ice interface resulting from the buildup of internal stress in the soil during the formation of ice lenses.Key words: frozen soil, freeze-thaw cycle, frost heave, thawing settlement, canal protection.

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