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Field Investigation and Monitoring of Land Subsidence Beneath Power Transmission Lines in Saturated and Unsaturated Zone

Nabi, Hossein | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56659 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadeghi, Hamed
  7. Abstract:
  8. The increase in the amount of groundwater exploitation and climate changes has made land subsidence into one of the environmental problems and has caused many problems in various infrastructures such as urban areas, residential buildings, and vital arteries such as power transmission lines. Many areas of the country, especially areas with smooth topography such as plains where alluvium accumulates, due to excessive exploitation of groundwater resources and climate changes, are facing a decrease in the level of groundwater, an increase in the thickness of the unsaturated layer, and as a result, progressive subsidence. In particular, the destructive effects of land subsidence on power transmission lines are of particular importance because any kind of disruption in the operation of these lines can cause significant economic losses until reconnection. Therefore, the main goal of this research is to monitor ground subsidence in the bed of power transmission lines. In order to achieve this goal, construction studies including the collection of primary information, site survey, field explorations, and laboratory tests were conducted. Also, the ground subsidence monitoring program is presented based on precise instrumentation inside the boreholes of the 230 kV Imam Khomeini Airport (RA)-Qom 1 and 63 kV Eshtehard-Shaharek Industrial power transmission lines. The results of laboratory studies, characteristics of divergence, consolidation and collapse of the bed soil of two high voltage transmission lines were investigated and analyzed. The results of this section showed that the subsoil of the selected towers of the 230 kV line is divergent and collapsing. On the other hand, the subsoil of the 63 kV line does not have the property of divergence but has a high collapse potential. In the end, the initial plan of soil mixing was done with different percentages of soil, and the level of 1% by mass combination of lime with soil can eliminate the ability to diverge and also reduce the potential of collapse in such a way that the soil is removed from the area of problematic soils
  9. Keywords:
  10. Land Subsidence ; Unsaturated Soil ; Power Transmission Line ; Soil Improvement ; Field Investigation ; Land Subsidence Monitoring

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