ACTIVE SUPPORT FORCE CALCULATION METHOD AND SYSTEM FOR TUNNEL PASSING UNDER EXISTING STRUCTURE

Provided in the present disclosure are an active support force calculation method and system for a tunnel passing under an existing structure, which relate to the technical field of rail transit engineering. The method comprises: analyzing stress on an existing station, acquiring address parameters of sandwiched soil and thickness and weight data of a soil body above the existing station, and calculating loads above the sandwiched soil and the existing station; using foundation stress to solve an upper load of the sandwiched soil to determine an upper load value of a center line position; and determining a sedimentation value of the existing station, determining a calculation expression of an active support force according to the conservation of energy, solving an included angle between a slip rupture surface and a horizontal direction by means of programming solving, and thus solving an active support force of the top of a newly built tunnel. After an active support force is obtained by means of the method o