Abstract:Aiming at the supporting problem of the shaft-boring in the deep alluvium of 500–700 m,the composite shaft lining of high strength and high performance concrete and double steel cylinder is presented. Firstly,the optimized mixture ratio of the shaft-boring lining C60–C75 high strength and high performance concrete is given. Then,according to similarity theory,the model design of the composite shaft lining of high and strength high performance concrete and double steel cylinder is done. Through model experiments,the characteristics of stress and strength of the composite shaft lining of and high strength high performance concrete and double steel cylinder are studied. The results indicate that the concrete bearing strength increases greatly under triaxial compressive stresses states between inner and outer steel plate cylinders. The concrete utmost compressive strain achieves -4 600 me and the shaft lining is fairly ductility when it is damaged. Thus,the results can provide a design basis for engineering practice of this shaft lining structure. Now the study results have been applied to three shaft-borings in the alluvium.