Loose rock mass tunnel steel wave plugboard anti-yielding advance support construction method

The invention discloses a loose rock mass tunnel steel wave plugboard anti-yielding type advance support construction method, which comprises the following steps: when a tunnel is excavated in a loose rock mass, steel wave plugboards are obliquely upwards driven into the front rock mass by 5-10 degrees from the back of a steel arch frame at the foremost part of a tunnel face by using a vibratory hammer, each steel wave plugboard is of an S-shaped steel structure, and the adjacent steel wave plugboards are lapped by a certain width; the steel wave inserting plates which are mutually overlapped and meshed form a stress whole, the tail portions of the steel wave inserting plates are fixed to the steel arch, no gap exists between the steel wave inserting plates, the rock-soil body above the steel wave inserting plates is completely prevented from falling off, steel wave crests of the steel wave inserting plates can generate certain deformation under the pressure effect of the rock-soil body, part of the rock-soil