In-situ measurement and analysis of freezing pressure of outer shaft lining in deep aqueous bed rock
Abstract：In order to thoroughly investigate the load of outer shaft lining in deep aqueous bed rock area,in-situ measurements on freezing pressure of outer shaft lining were carried out in bed rock in Hujierte coalfield in Chinese Erdos.The in-situ measurement results reveal that the process of freezing pressure can be described by 4 periods：dramatic increase period,slow increase period,rapid increase period and gradual decrease period.The freezing pressure is mainly affected by rock moisture content and rock strength,but the rocks buried deep H affects little.The freezing pressure reaches 76.4%~89.8% of the maximum freezing pressure Pmax at 10~15 days after concrete pouring.Therefore,it is recommended using 7 days concrete strength index to guarantee the safety of outer shaft lining during the early period.The freezing pressure reaches the maximum value Pmax at 80~100 days after concrete pouring,the measured value of Pmax is 1.08~1.74 MPa.Pmax is much smaller than hydrostatic pressure P0 and the maximum freezing pressure Pω in deep alluvium.
Keywords：deep aqueous bed rockfreeze sinking methodfreezing pressureouter shaft lining
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)