Mechanical properties of airbag frame ground beams for slope support

In view of the slope instability caused by frequent natural disasters such as earthquakes and collapses, a new type of ground beam structure with airbag anchor frame which can quickly respond to rescue and relief work is proposed, and the working mechanism of the new structure is described. The stress characteristics of FRP and airbag are analyzed when the ground beam of airbag frame is loaded, and the method for the bearing capacity of the ground beam of airbag frame is given. Combined with the theory of pneumatic transmission and double-layer elastic foundation beam, the model for calculating the coordinated deformations of the airbag frame ground beams, bolts and soils is established, and the relevant method for the mechanical effects of the airbag frame ground beams at the construction stage and working stage of slope support is given. The results show that: (1) The bearing capacity of the airbag frame beam structure is mainly determined by the thickness of frame beam, the strength of plate, and the internal pressure and height of the airbag. Increasing the thickness of frame plate, the strength of plate, and the internal pressure and height of airbag can improve the bearing capacity of the structure. (2) The airbag frame beams for slope support have two stages: construction and working. The bending moments and shear forces at the working stage are larger than those at the construction stage, and the shear forces and bending moments of the frame beams at the foot of the slope rise greatly at the working stage, which should be considered as the most unfavorable factor in the design. (3) The support design should also comprehensively consider the support effects, structural bearing capacity and economy, and give the design scheme to ensure the reliability, timeliness and economy of the structure in the actual rescue and disaster relief. The research results may provide a theoretical basis and guidance for the design and application of the new structure in rapid slope support.