Anti-deformation supporting method based on large-section tunnel of soft rock stratum

The invention discloses an anti-deformation supporting method based on a large-section tunnel of a soft rock stratum. The anti-deformation supporting method comprises the following steps that S1, geologic characteristics of surrounding rock are preliminarily analyzed according to collected TBM tunneling parameters; s2, laying a reinforcing mesh; s3, an arch frame is installed in the extending direction of the tunnel, the arch frame comprises a plurality of arch frame units, and each arch frame unit comprises connecting plates arranged at the two ends of an arch frame unit body; a central through hole is formed in the connecting plate between every two adjacent arch frame units, grouting openings are formed in the corresponding positions of the flanges of the arch frame sets, and grouting pipes are arranged at the grouting openings; s4, concrete is poured through the grouting pipes, and a box-type concrete arch frame is formed; s5, anchoring and supporting; s6, high-strength nanometer crude fiber concrete is s