Numerical Simulation of Frost Heave of Concrete Lining Trapezoidal Channel Under an Open System

Mo, Tengfei; Lou, Zongke

doi:10.3390/w12020335

Cited by 13 publications

(10 citation statements)

References 13 publications

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“…Figure 2 shows the sketch of mechanical failure of the concrete slab joints. The maximum bending moment caused by the frost heaving force occurred at a height of 1/3 from the bottom to the top bank of the canal [52], which resulted in more serious damage to the W3 and E3 locations than the W1, W2, E1, and E2 locations. No damage was found on the joints between the precast concrete slabs at the bottom of the canal, as shown in Table 2.…”

Section: Damage Characteristics Of Canal Liningmentioning

confidence: 99%

“…A decrease in the seepage control of the lining canal has been found for long-term main, branch, lateral, and sub-lateral canals lined with concrete or concrete with geomembrane, which greatly decreases the water conveyance efficiency [51]. In recent years, a combination of different lining materials has been used to decrease seepage loss and prevent lining frost heave damage in HID [52]. Therefore, it is necessary to investigate whether the combination of different lining materials can guarantee the long-term durability of canal systems in this area.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on Concrete and Geomembrane Lining Effects on Canal Seepage in Arid Agricultural Areas

Han

Wang

Zhu

et al. 2020

Water

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Canal lining is commonly used to reduce seepage loss and increase water use efficiency. However, few studies have quantitatively estimated the seepage control effects of different lining materials under different service times. Ponding tests were conducted on the same canal section with four different lining statuses to investigate the canal lining effect on seepage control and its impact factors in arid areas. The cracks and holes in different lining materials were surveyed, and the canal seepage rates under the four test treatments were calculated by monitoring the water level change in the canal. The results show that the cracks in the joints of the two precast concrete slabs and holes in the geomembrane, which are located 0.25 m above the canal bottom on two sides of the canal, are responsible for the increased seepage loss. The new concrete and geomembrane lining combination reduces seepage by 86% compared with no lining, while seepage can be reduced by 68% using the concrete and geomembrane lining combination after three service years, and the amount decreases to 11% by using geomembrane lining with a three year service time. Based on the experiment and literature, a statistical relationship between the seepage reduction and lining service time was established, which provided a possible and easy way to estimate seepage losses from lined canals and improve the estimation accuracy using an empirical formula. Without considering the service time lining effect, the seepage loss is underestimated by 58%, and the canal water use efficiency is overestimated.

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Section: Damage Characteristics Of Canal Liningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Concrete and Geomembrane Lining Effects on Canal Seepage in Arid Agricultural Areas

Han

Wang

Zhu

et al. 2020

Water

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“…The heat transfer, moisture migration, and phase change all interact during the freeze–thaw process. This coupling effect is an important cause of subgrade freeze–thaw damage [ 8 , 9 , 10 , 11 , 12 , 13 ]. In order to effectively control subgrade damage and maintain the long-term safety of the highway in seasonally frozen regions, it is necessary to study the coupling mechanism of physical fields inside frozen soil, and to reveal the freeze–thaw law of subgrade in seasonally frozen soil areas.…”

Section: Introductionmentioning

confidence: 99%

A Freezing-Thawing Damage Characterization Method for Highway Subgrade in Seasonally Frozen Regions Based on Thermal-Hydraulic-Mechanical Coupling Model

Deng

Liu

Zeng

et al. 2021

Sensors

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Seasonally frozen soil where uneven freeze–thaw damage is a major cause of highway deterioration has attracted increased attention in China with the rapid development of infrastructure projects. Based on Darcy’s law of unsaturated soil seepage and heat conduction, the thermal–hydraulic–mechanical (THM) coupling model is established considering a variety of effects (i.e., ice–water phase transition, convective heat transfer, and ice blocking effect), and then the numerical solution of thermal–hydraulic fields of subgrade can be obtained. Then, a new concept, namely degree of freeze–thaw damage, is proposed by using the standard deviation of the ice content of subgrade during the annual freeze–thaw cycle. To analyze the freeze–thaw characteristics of highway subgrade, the model is applied in the monitored section of the Golmud to Nagqu portion of China National Highway G109. The results show that: (1) The hydrothermal field of subgrade has an obvious sunny–shady slopes effect, and its transverse distribution is not symmetrical; (2) the freeze–thaw damage area of subgrade obviously decreased under the insulation board measure; (3) under the combined anti-frost measures, the maximum frost heave amount of subgrade is significantly reduced. This study will provide references for the design of highway subgrades in seasonally frozen soil areas.

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“…Frozen soil is widespread across the world, covering a total area of about 23% of the land area [1]. Different types of frozen soil cover the territory of China, of which the total area of seasonal frozen soil is about 4.76×10 6 km², accounting for about 49.6% of China's territory [2].…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydrothermal Coupling Characteristics of Polyurethane Insulation Boards Slope Protection Structure Incorporating Phase Change Effect

Liu

Wang

et al. 2021

Preprint

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As an important hydraulic infrastructure, the canals are essential for agricultural irrigation, shipping and industry. In the seasonal freeze regions, the water conveyance canals are damaged due to the effects of freeze-thaw cycles. The freeze depth of soil in the water transfer canal varies considerably due to changes in temperature and water content. The paper compares the relationship of the freeze depth, temperature and water content by field tests and numerical calculation methods Incorporating phase change. The results show that the decrease in temperature causes the water in the soil to freeze, the ice front migrate downwards, and the water in soil below ice front gradually migrate towards the ice front, resulting a large difference in water content of the soil before and after freezing. An insulation slope structure, Polyurethane insulation board + Concrete board slope structure (PC), is proposed in this paper to mitigate the effect of freezing and thawing on the water conveyance canals. Under the protective effect, the freeze depth decreases significantly. In addition, this paper compares the anti-frost effect of different thicknesses polyurethane insulation boards, and the results can provide a reference for the anti-frost design of water conveyance canals.

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Numerical Simulation of Frost Heave of Concrete Lining Trapezoidal Channel Under an Open System

Cited by 13 publications

References 13 publications

An Experimental Study on Concrete and Geomembrane Lining Effects on Canal Seepage in Arid Agricultural Areas

An Experimental Study on Concrete and Geomembrane Lining Effects on Canal Seepage in Arid Agricultural Areas

A Freezing-Thawing Damage Characterization Method for Highway Subgrade in Seasonally Frozen Regions Based on Thermal-Hydraulic-Mechanical Coupling Model

Study on the Hydrothermal Coupling Characteristics of Polyurethane Insulation Boards Slope Protection Structure Incorporating Phase Change Effect

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