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隧道格栅钢架与喷混凝土联合支护的作用机理复杂,有必要进行定量的试验研究。针对隧道拱架以承受压弯作用为主,分别进行了钢格栅混凝土与钢格栅、素混凝土三种结构在相同试验条件下的轴压短柱模型与围压拱架模型的有限元数值试验,得出了3种结构的总荷载-位移曲线。通过对3种结构的对比研究,验证了钢格栅混凝土组合结构力学性能的改善效果,并从数量上得出了承载力提高的程度。
The mechanism of joint support between tunnel grille steel frame and shotcrete is complex and it is necessary to carry out quantitative experimental study. Aiming at the effect of bending and bending of the tunnel arch frame, the finite element numerical results of the axial compression short column model and confining pressure arch model under the same test conditions were respectively carried out for the three structures of steel grating concrete, steel grid and plain concrete, Test, the total load - displacement curve of the three structures was obtained. By comparing the three kinds of structures, the improvement effect of the mechanical properties of the steel grating concrete composite structure is verified, and the degree of the bearing capacity improvement is obtained quantitatively.