Construction technology and monitoring analysis on concrete strain of a new singlelayer shaft lining in deep aqueous bed rock during freeze sinking
Abstract：Based on the project example of Hulusu Coal Mine in Hujierte mining area, construction technology and mo- nitoring analysis on concrete strain of a first new singlelayer shaft lining was carried out in bed rock during freeze sinking. Some main technical difficulties in construction process were analyzed in detail and the concrete quality con- trol standards of shaft lining were given. In-situ measurement results reveal that concrete strain is the combined action result of freezing pressure and shaft lining temperature. The process of concrete strain can be described by 4 periods： OA period ,AB period ,BC period and CD period. At 99.6 - 149.5 days after concrete pouring, the maximum vertical compressive micro-strain reaches -190. 5 --458.0 and the maximum tangential compressive micro-strain reaches -590. 4 - -799. 1. The maximum tangential compressive micro-strain is 1.3 - 4. 2 times of vertical direction. Mean- while, the maximum tangential compressive micro-strain is not more than 25.7% of concrete ultimate compressive mi crostrain εmax Therefore, the new single-layer shaft lining of Hulusu Coal Mine is in safe status during freeze sinking.
Keywords：deep aqueous bed rocka new single-layer shaft liningconstruction technologyconcrete strainfreezesinking
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 192-199 )