| Based on the deep roadway supporting problem, and with concrete filled steel tube as theresearch object, through three methods such as experimental test, numerical simulation andtheoretical calculation analysis, the comprehensive analysis of concrete filled steel tube shortcolumn and circular arch mechanics performance is done in this paper. By concrete filled steeltube short column axial compression experiment and concrete short columns conventionaltriaxial test, it is contrasted that the bearing capacity of concrete filled steel tubular short columnunder different wall thickness, it is analyzed that the wall thickness effect on bearing capacity ofshort columns, influence of plastic deformation characteristics and failure pattern, the wallthickness effect is concluded. By the bending performance test of flexural strengthening concretefilled steel tube straight beam and the load-bearing performance experiment of flexuralstrengthening concrete filled steel tube arch, it is researched that bearing capacity and the neutrallayer migration rule of straight beam and arch under the different flexural strengthening. The flatsection assumption establishment condition of straight beam bending deformation is verified. Itis analyzed that the effect of load form and rise-span ratio on arch bearing performance, theneutral layer of offset and bending bearing capacity calculation formula were deduced.Engineering application of concrete filled steel tube support is done in the km deep well, thesupporting load is measured, and good support results is achieved. |
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