关键词: 轴压水压, 井壁混凝土, 强度准则, 承载力, 模型试验

Abstract: To solve the safety problem of shaft lining design in water-bearing bedrock segment,based on the similarity model theory,concrete strength grade,thickness diameter ratio and reinforcement ratio were taken as the influencing factors on the bearing capacity of shaft lining,and nine sets of orthogonal tests were designed and completed.Stress and strain characteristics,failure characteristics and mechanism of shaft lining concrete under corresponding conditions were studied.A strength criterion and bearing capacity calculation formula of shaft lining concrete were established.The model generally shows compressive shear failure and stress on the inside of shaft is greater than that on the outside,that compared with the present mine design formula,the strength criterion has higher accuracy,and the deviation range is -6.00% to 6.94%,that as the concrete strength grade increases,the bearing capacity of shaft lining increases linearly,an increase of 10 MPa causes an average increase of 11.04%,that increasing the reinforcement ratio has a very weak influence on the bearing capacity of shaft lining,and is not conducive to controlling the cost.

Key words: axial pressure and hydraulic pressure, shaft lining concrete, strength criterion, bearing capacity, model test