Research on Reduction Coefficients of Water Pressure on Outer Surfaces of Linings of Inclined Shaft Tunnels in Deep Embedment
To study the influence of water pressure on outer surfaces of lining structure of inclined shaft tun-nels in coal mines,taking an inclined shaft tunnel project across the rich water aquifer with a weak water yield property as the research object,the analytical formula for reduction factors of water pressure on outer surfaces of linings of tunnels was derived by analyzing water head reduction caused by hydromechanical characteristics and stratigraphic properties in processes of groundwater seepage.Simltaneoushy,based on the project,the rationality of the formula for reduction coefficients of water pressure was evaluated and veri-fied by finite element simulations.On the basis,the influence of three engineering controllable factors in-cluding radii of grouting rings,permeability coefficients of grouting rings and radii of tunnels on reduction coefficients of water pressure on outer surfaces of linings of tunnels was studied.The results showed that the increase in the thickness of grouting rings would significantly reduce reduction coefficients of water pressure on outer surfaces of linings,while the increase in the permeability coefficients of grouting rings and radii of tunnels would increase the reduction coefficients of water pressure on outer surfaces of linings significantly.
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