Supporting method of large-section tunnel in water-rich complicated geological mass

The invention particularly provides a supporting method of a large-section tunnel in water-rich complicated geological mass and solves the problem that supporting of the large-section tunnel in the water-rich complicated geological mass fails to be achieved by the common supporting methods. The supporting method includes: arranging a micro-arc arched roof and an inverted-camber floor in the tunnel, and using anchor ropes and anchor bolts for combined supporting. The supporting problem of the large-section tunnel with rich-water roof and rheological property, expansibility and softness is solved, surrounding rock is controlled effectively, loss caused by instability of the tunnel is avoided, coal resources are exploited effectively, production technological level of enterprises is increased, and huge social and economic benefits are achieved.