Steel Arch Support, is a kind of arch structure made of steel sections (such as I-beam, channel steel, H-beam, etc.), which is used to support and reinforce the surrounding rock or soil body. This type of support through the high strength and stiffness of steel, timely and effectively bear the surrounding rock load, to ensure the stability and safety of the structure.
Overall stress analysis:
Pressure distribution: the overall pressure on the section Support Arch, especially at the top of the arch where the axial force is the largest, and its value gradually decreases from the top of the arch to the foot of the arch. This is because in the arch structure, the load is transferred to the two sides of the arch foot through the top of the arch, forming a pressure distribution.
Bending moment action: at the side wall, the section Steel Arch Support is subjected to the largest bending moment, and the positive and negative bending moments alternate frequently, which reflects the complexity of the force at the side wall. The generation of bending moment is mainly due to the fact that when the arch structure is subjected to horizontal thrust, the reaction force to resist the horizontal thrust will be generated at the foot of the arch, thus generating bending moment in the arch body.
Interaction with surrounding rock:
Convergence constraint method: the study shows that there is a convergence constraint effect between the section Support Arch and the surrounding rock. After the section steel arch support, the deformation of the surrounding rock is constrained, thus improving the self-supporting capacity of the surrounding rock. At the same time, the steel arch also bears the pressure transferred from the surrounding rock, realizing the common role of support and surrounding rock.
Anchor role: in the Steel Arch Support system, anchors are usually used as auxiliary support measures. Anchors are driven into the surrounding rock and prestressed, forming a support system together with the Steel Arch Support. The existence of anchor can further restrain the deformation of surrounding rock and improve the overall stability of the support system.
