Calculation method of vertical bearing capacity and correction coefficient of bridge pile foundation in loess hidden-hole area

The invention discloses a calculation method of vertical bearing capacity and a correction coefficient of a bridge pile foundation in a loess hidden-hole area. Under different working conditions, thevertical ultimate bearing capacity P0 of the bridge pile foundation when no hidden hole exists around a pile body and the vertical ultimate bearing capacity P of the bridge pile foundation when a hidden hole exists around the pile body are obtained through experiment, and j=1,2; when the loess hidden hole is on one side of the bridge pile foundation, the vertical ultimate bearing capacity of the bridge pile foundation is recorded as P1; when the loess hidden hole is at the bottom of the bridge pile foundation, the bearing capacity of the bridge pile foundation is recorded as P2; the influence degree alpha of the bearing capacity of the bridge pile foundation is calculated according to the formula (please see the specification for the formula), and then the correction coefficient zetaof the vertical bearing capacit