Abstract: To explore the construction process and application effect of steel corrugated plate-mold bag concrete support structure in circular shafts, the influence patterns of pressurized drainage on the strength of mold bag concrete at different curing ages are examined through indoor uniaxial compression tests. Then, a three-dimensional finite element numerical simulation is performed to facilitate the second phase of the field process test of the steel corrugated plate-mold bag concrete support structure, which validates its feasibility and application effect. The results demonstrate the following: (1) The pressurized drainage process substantially enhances the early compressive strength of the mold bag concrete. The lightweight mold bag exhibits a better effect on increasing the compressive strength of the mold bag concrete during the pressurized drainage process. (2) The mold bag concrete effectively fills the gap between the corrugated steel plate and excavation face, and the mold bag discharges the gas and water of concrete and thus shortens the solidification and shaping period. (3) The concrete-pouring process slightly affects the corrugated steel plate force, and every corrugated steel member is in a uniform stress state under working conditions. (4) A lightweight mold bag of polyester filament spunbonded needle punched nonwoven geotextile is recommended for similar projects.

Key words: corrugated steel plate, mold bag concrete, circular shaft, pouring pressure