Damping ditch with pressure relief device and shockproof plates and construction method for damping ditch

The invention discloses a damping ditch with a pressure relief device and shockproof plates and a construction method for the damping ditch. The damping ditch comprises a circle of support piles (1) and a circle of capping beam (2); the outer side of the circle of support piles (1) is provided with a circle of cement-soil mixing piles (3); top inner supports (4) are arranged at elevation positions of the capping beam (2); the inner side of each row of the support piles (1) extending along a length direction is connected with an edge shockproof plate (6); a pressure relief pipe (9) is also inserted into the bottom of the damping ditch; a damping particle layer is laid in the damping ditch from the bottom of the ditch to top; foam (8) is filled from the top part of the damping particle layer to a ground elevation; multiple rows of middle shockproof plates (11) different in layer height are buried in the damping particle layer; the key step of the construction method is that a process of laying the damping parti