Optimization analysis of the stress characteristics and supporting structure parameters of the composite shaft lining with inner steel plate and outer high-strength concrete
Based on the elastic analytical solution of the composite shaft lining with inner steel plate and outer high-strength concrete subjected to uniform confining pressure,the Mises yield criteria and unified strength theory were used to design the thicknesses of the inner steel plate and the outer high-strength concrete,respectively,and the initial yield state of the composite shaft lining was studied.In terms of the condition that the inner steel plate and the outer concrete be not yielded,the design scheme of the composite shaft lining was proposed.The results showed that when the inner radius,confining pressure and materials were given,there existed an optimal range of the outer and delamination radii.If the outer radius and the corresponding delamination radius were selected in this range,the inner steel plate and the outer high-strength concrete would not be yielded.Compared with a model test,it was found that for the tested composite shaft lining with given inner,outer,delamination radii and materials,when the con-fining pressure was chosen to be equal to the proposed design value,the outer and delamination radii would be in the optimal range.The model test also showed that,when the confining pressure continued to increase,the outer high-strength concrete entered plasticity before the inner steel plate.Combining the elastic solution and the yield criterion,the design process of the composite shaft lining can be given as follows:the inner radius and the confining pressure value of the shaft lining are first determined by the specification and engineering geological condition,and second,the materials of the composite shaft lining are selected,and the yield criteria are used to obtain the optimal range of the outer radius and the delamination radius.
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