Study On Coupling Heat-moisture-stress Of Frozen Wall’s Rock In The Freezing Of Air Shaft Of Xin Zhuang Coal Mine

Freeze method is effective constructiom method of through the unstable rock and soillayer, but the properties research of cretaceous stratum rock in the freezing is not ye maturetherefore, to carry out the study temperature field, moisture field, stress field of frozen wall’srock in the process of freezing has the vital significance for the study of cretaceous stratumrock properties of physical and mechanical and the actual engineering application.The article based on the frozen engineering of Xin Zhuang coal mine wind shaft,analysis the temperature field, moisture field, stress field of frozen wall from theoretical.Discusses the basic concept and the influence factors of temperature field, the principle anddriving force of moisture migration as well as the related concepts of stress field, anddiscussed the interaction mechanism of rock composition, moisture content, temperature andstress. Through field monitoring, getting the thermometer hole temperature change rule in theforming process of frozen wall, the influence law of the hydrated heat from the concrete shaftliner to the frozen wall temperature field, and the changing regularity of freezing pressure.Using finite element software ANSYS simulate the temperature field, stress field offrozen wall and get the distribution law of temperature, stress of frozen wall, as well as theinfluence law of the hydrated heat to the frozen wall temperature field. Comparative analysisof the measured and simulated data can get the following conclusion: the change of the frozenwall temperature can be divided into initial stage of freezing, positive stage of freezing,maintenance stage of freezing; the influence depth is1.5meters of the hydrated heat for thefrozen wall; the thermal conductivity of coarse grained sandstone is greater than mediumgrained sandstone; the moisture migration under the action of temperature gradient is themain reason of measured temperature value different from simulated temperature value;frozen pressure increases quickly after the completion of concrete shaft liner, with thestrength increase of shaft liner and stress release of frozen wall, the growth rate decreasesfreezing pressure and tends to be stable.