Experimental study on mechanical properties of frozen soil in deep soil of Wanfu coal mine

Aiming at the problems of inadequate basic theory and lack of engineering experience in the construction of deep surface soil in Wanfu CoalMine, it is required to collect the soil samples of the Wanfu deep well and to carry out the testing and analysis of the mechanical properties of the frozen soil.The results indicated :At the freezing temperalure designed in this experiment, the uniaxial compressive strength , triaxial compressive strength , creep stress , and frost-heaving force of the frozen soil samples all show an increasing trend with the decrease of the freezing temperature.At the same time , the creep performance of frozen soil in the deep surface soil layer is particularly obvious.The influence of water content and sampling depth on the design of frozen wall can not be ignored.Therefore , according to the data of the single axis compression test , the three axis compressive strength test , the uniaxial creep test and the frost heave test , the multiple regression analysis is carried out ,comprehensive consideration of the effects of freezing temperature , moisture content and sampling depth on the mechanical properties of frozen soil specimens ,the mathematical models possess high degree of fit and good correlation.It provides technical support for the design of the frozen wall of deep surface layer and the determination of mechanical parameters under different geological conditions.