Optimum Design Of Compressible Shaft Lining Joint Of Freezing Shaft Based On ANSYS

Since the 1980 s,more and more coal mine shaft that have been constructed by freezing method in Huanghuai area in China have been destroyed,and it has been found that the negative frictional force(vertical additional force)which is used for the drainage of the underground aquifer is the main cause of the freezing shaft damage.To this end,Anhui University of Technology and its cooperative unit developed the vertical shrinkage of the shaft wall joints in the freezing wellbore,which is arranged in the inner lining of the freezing wellbore,to attenuate the vertical additional force and ensure the safety of the shaft.Although the shrinkage shaft joint of freezing well has been successfully applied to several mine shaft,the optimum design method is worthy of further discussion.In this paper,the mechanical properties and optimum design methods of the compressible shaft joints in the frozen well are studied by using the method of theoretical analysis and numerical simulation,based on the Ansys finite element program,and the Qinan shaft joints of the North wind well and Yangcun mine in the mine shaft are studied.Its main research contents and results are as follows:(1)According to the Qinan mine shaft lining structure scheme of North wind well and Yangcun mine,based on the simplified design theory,the parameters of the compressible shaft lining of the north wind well and Yangcun mine in Qinan Mine are designed preliminarily,and the lining joints of the North wind well in Qinan mine are made of double vertical plate structure,which is arranged in-258 m and-303 m layers.The shaft lining joint of Yangcun mine wind shaft adopts the three-stand plate structure,which is set in the-440 m and-550 m layers.(2)The joints of-303 m and Yangcun mine wind well-550 m layer SANLI plate shaft lining of Qinan mine North wind Well are studied,respectively,an axisymmetric finite element model is established by using ANSYS program to analyze the mechanical properties of the shaft lining joints,and the vertical and The horizontal bearing capacity is 22.4 and 28 MPa respectively,and the vertical and horizontal bearing capacity of the three-vertical shaft lining joints is 28 and 30.8MPa respectively.(3)The joints of-303 m and Yangcun mine wind well-550 m layer SANLI plate shaft lining of Qinan mine North wind Well are studied,respectively,using Ansys finite element program,the thickness of each vertical plate of the joint is the design variable,and the maximum Von Mises of the joint under vertical load is the state variable.,taking the cross section area of the joint as the objective function,the shaft wall joint is optimized,so that the thickness of the outer plate of thedouble vertical shaft lining is reduced by 10 mm,and the thickness of the Sanli plate lining joint is also reduced by 10mm.