Study On The Stress And Structure Of Composite Shaft Lining In Deep Thick Alluvium

With the gradual reduction of the coal resources in shallow surface soil in Midwestof China, the main exploitation of coal is shifted to the deep thick alluvium. Since thereare uncertainty and complexity about bearing load on the composite shaft lining in deepthick alluvium, which lead to frequently broken of the shaft lining, it is necessary tomake its bearing condition clear and make its structure design more actual. This articlestudies the bearing condition and structure design of the composite shaft lining in deepthick alluvium by using the theory analysis and numerical simulation methods, and hasgot the main content of the followings:The article uses the elastic theory to calculate the elastic solution of the compositeshaft lining, and analyzes the effect of the elastic modulus, the thickness and Poisson’sratio of the dissection for the composite shaft lining based on the elastic solution, theresult shows that under the same conditions the greatest effect is the elastic modulus ofthe dissection, the dissection thickness followed, then is Poisson ratio; for the inner andouter layer of the shaft lining, the elastic modulus of the dissection has greater effect forthe inner layer of the shaft lining, the dissection thickness has greater effect for the outerlayer of the shaft lining, the effect of Poisson ratio can be ignored because it has lesseffect for the inner and outer layer of the shaft lining, so in order to effectively reducethe effect of stress for the stability of the composite shaft lining, it should consider theelastic modulus of the dissection material firstly and then consider the thickness of thedissection in the design of the composite shaft lining.According to the design concept of combining the “yield pressure, absorption andresistance” of resistance to dynamic pressure shaft lining structure, this paper putsforward a new kind of shaft lining structure—anti-mining shaft lining structure,throughnumerical simulation, we found that the shaft lining structure can absorb the shear stressin surrounding rock produced by mining, mass deformation leaded by surroundingrock’s ripping, bending energy and vertical deformation produced by shaft lining, andcan resist the damage to the shaft lining caused by the deformation of the surroundingrock, playing a role of “yield pressure, absorption and resistance”.