Flow deflecting type drainage system for maintaining bearing capacity of loess foundation and construction method

The invention provides a flip bucket drainage system for maintaining the bearing capacity of a loess foundation and a construction method, relates to the technical field of highway foundation drainage construction, and can maintain the bearing capacity of the loess foundation. The flip-flop drainage system comprises a first drainage section for conveying road drainage to a steep cliff, a second drainage section for conveying drainage of the first drainage section to the bottom of the cliff, and a third drainage section for discharging drainage of the second drainage section out of the bottom of the cliff; the steep cliff is in collapsible loess geology, and the cliff bottom is in non-collapsible loess geology; the second drainage section adopts flip-flop drainage, drainage water of the second drainage section is flown to the third drainage section, and the third drainage section performs energy dissipation treatment on the drainage water of the second drainage section and then discharges the drainage water. T