Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines
With the development of ultrahigh voltage transmission line construction in northwest China, an increasing number of overhead transmission lines are crossing the loess regions. Ensuring the stability of electricity transmission towers and mitigating the risk of collapse are crucial prerequisites for...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2023-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2023/7272036 |
| _version_ | 1797785143749902336 |
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| author | Longfei Zhang Zaiqiang Hu Hongru Li Haicheng She Xiaoliang Wang Xiaoning Han Xi Yang |
| author_facet | Longfei Zhang Zaiqiang Hu Hongru Li Haicheng She Xiaoliang Wang Xiaoning Han Xi Yang |
| author_sort | Longfei Zhang |
| collection | DOAJ |
| description | With the development of ultrahigh voltage transmission line construction in northwest China, an increasing number of overhead transmission lines are crossing the loess regions. Ensuring the stability of electricity transmission towers and mitigating the risk of collapse are crucial prerequisites for the construction of transmission lines. Taking the 750 kV demonstration electricity transmission line in Guanting–Lanzhou East as an example, representative loess samples were selected for compression and collapsing sensitivity tests. Four foundation treatment schemes were designed, and the wetting deformation characteristics were investigated through numerical simulation of the rainfall infiltration process. Corresponding optimisation schemes were proposed. The collapsing process was divided into four stages through laboratory collapsing tests. The relationship function between saturation and the Duncan–Chang model parameters of loess was established, which was introduced into the finite element model to consider the rainfall infiltration process. The analysis of the displacement field, and loess saturation field with time after rainfall infiltration for the four schemes showed that adding a lime-stabilised soil cushion layer and waterproof layer to the inclined column foundation had the best effect. Given that the design scheme needs to consider safety and economy, the thickness of the cushion layer was optimised, thereby reducing the use of lime-stabilised soil by 20%. Research findings provide meaningful guidance for the design of transmission tower foundations in loess areas. |
| first_indexed | 2024-03-13T00:49:55Z |
| format | Article |
| id | doaj.art-faaa3489011649b4a43459aea78d4c01 |
| institution | Directory Open Access Journal |
| issn | 1687-8094 |
| language | English |
| last_indexed | 2024-03-13T00:49:55Z |
| publishDate | 2023-01-01 |
| publisher | Hindawi Limited |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj.art-faaa3489011649b4a43459aea78d4c012023-07-08T00:00:14ZengHindawi LimitedAdvances in Civil Engineering1687-80942023-01-01202310.1155/2023/7272036Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission LinesLongfei Zhang0Zaiqiang Hu1Hongru Li2Haicheng She3Xiaoliang Wang4Xiaoning Han5Xi Yang6Institute of Geotechnical EngineeringInstitute of Geotechnical EngineeringInstitute of Geotechnical EngineeringSchool of Urban ConstructionInstitute of Geotechnical EngineeringInstitute of Geotechnical EngineeringInstitute of Geotechnical EngineeringWith the development of ultrahigh voltage transmission line construction in northwest China, an increasing number of overhead transmission lines are crossing the loess regions. Ensuring the stability of electricity transmission towers and mitigating the risk of collapse are crucial prerequisites for the construction of transmission lines. Taking the 750 kV demonstration electricity transmission line in Guanting–Lanzhou East as an example, representative loess samples were selected for compression and collapsing sensitivity tests. Four foundation treatment schemes were designed, and the wetting deformation characteristics were investigated through numerical simulation of the rainfall infiltration process. Corresponding optimisation schemes were proposed. The collapsing process was divided into four stages through laboratory collapsing tests. The relationship function between saturation and the Duncan–Chang model parameters of loess was established, which was introduced into the finite element model to consider the rainfall infiltration process. The analysis of the displacement field, and loess saturation field with time after rainfall infiltration for the four schemes showed that adding a lime-stabilised soil cushion layer and waterproof layer to the inclined column foundation had the best effect. Given that the design scheme needs to consider safety and economy, the thickness of the cushion layer was optimised, thereby reducing the use of lime-stabilised soil by 20%. Research findings provide meaningful guidance for the design of transmission tower foundations in loess areas.http://dx.doi.org/10.1155/2023/7272036 |
| spellingShingle | Longfei Zhang Zaiqiang Hu Hongru Li Haicheng She Xiaoliang Wang Xiaoning Han Xi Yang Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines Advances in Civil Engineering |
| title | Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines |
| title_full | Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines |
| title_fullStr | Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines |
| title_full_unstemmed | Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines |
| title_short | Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines |
| title_sort | hazards and treatment of collapsible loess foundation on ultrahigh voltage transmission lines |
| url | http://dx.doi.org/10.1155/2023/7272036 |
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