DOI: 10.11799/ce201709002
Application and research of inclined shaft freezing technology in shaft construction of Libi Coal Mine
LI Liang-shan
Abstract：In order to realize safe and rapid construction of mine shaft crossing loose layer and water-rich area of intensely weathered zone in bedrock, the author analyzes the difficulties in freezing construction and put forward the solution, with full consideration of the survey results of surface hydrogeology and geology, the shaft cross section and domestic construction level of inclined shaft, as well as the principle of safety and reliability, economy, freezing - tunneling combination and servicing tunneling. The freezing scheme is designed scientifically using the technology of freezing vacuum and insulation, treatment technology of freezing connection section in inclined shaft, calculation method of freezing the two sides through vertical holes and fixed beam model in inclined shaft. Equivalent freezing time and control technology of excavation section and the method of freezing step-by-step input are proposed in the construction. The outside holes are connected along the shaft, the middle row of holes are connected along the transverse direction, with segmented freezing and step-by-step input. The freezing-tunneling coordination is explored and optimized, the freezing cost is reduced by 10%, and the tunneling efficiency is improved by 15%.
Keywords：inclined shaft freezing technologyequivalent freezingvacuum insulationstep-by-step input
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 6-9 )