| In the development of deep coal resources,the thickness of the alluvial layer through the vertical shaft is constantly increasing,and the application of the high-strength reinforced concrete shaft lining with higher bearing capacity is required.This paper studies the stress characteristics and stress distribution characteristics of high-strength reinforced concrete shaft lining by theoretical analysis,model research and numerical simulation.First,various external loads of shaft lining during freezing construction are studied.According to the external load characteristics and the engineering reality,the new reinforcement conversion coefficient is defined and its formula analyzes the ultimate bearing capacity formula of concrete shaft lining according to plane strain and plane stress and different strength criteria.The C80,C90 high strength concrete shaft lining model research was conducted,and studied the stress distribution of the shaft lining model under uniform surrounding or uneven surrounding pressure.The measured stress state of the shaft lining under the uniform load basically met the assumption of the shaft lining concrete and reinforcement.When the uneven coefficient was 1.15,1.3,the peak stress of the shaft lining was increased by 25%,45%,150% respectively,and the peak stress of reinforcement increased by 28%,75%and 172%.ANSYS software analyzed the high strength concrete shaft lining and studied the stress distribution characteristics of concrete with different strength levels under uniform surrounding pressure and uneven surrounding pressure.The results show that the stress distribution state of the Lamar formula fits the measured stress distribution state of the model research,the design calculation of concrete shaft lining shall consider the influence of uneven load on the stress distribution of the shaft lining. |
