Mechanical Mechanism And Design Theory Of Shaft Lining Constructed In Subsidence Area

With increasing mine exploitation and the depth of mine enhancing, it forms a great deal empty area at subterranean because of the mine layer's empty and the breakage of the covered terrane. The existence of empty area destroys the balance of mechanics in the rock layers. The stress in the rock layer is redistributed and come into being stress centralizing to be ground pressure, which makes the tip plank, wall rock and jamb distortion, demolish and displace. These lead to tip board declining and the sink of the earth's surface. The subsidence area in the empty area is defined moving basin or mine collapse area. Shaft construction is not only a practical problem but also important meaning in economy. This thesis's background is a new shaft constructed in subsidence area of xinzhuangzi mine, the city of Huainan, Anhui province. The author researched the shaft figuration and mechanical trait with theory analysis, model test and numerical calculations. Firstly, the author analyzed the load of shaft lining and relationship between stress and strain. Then he discussed the interaction of shaft lining and surrounding rock. From simulation theory, the author design some different model test, emphasized the sliding plane and yielding joint. In the facet of numerical calculations, by using the software ansys9.0, the author analyzed the sink of ground, displacement, mechanical strait of shaft lining and yielding joint. Besides these, six different shaft lining models were compared by computer simulation technique. The research result of this thesis will help to design and construct stand shaft in subsidence area.