The invention provides a method for foundation replacement construction of a
peat soil soft foundation box
culvert. The method comprises the following steps of, measuring and setting out, and confirming an excavation area; carrying out excavation for the first time from the first side of the box
culvert foundation along the transverse direction of the roadbed and the longitudinal centerline of thebox
culvert, and laying
geotextile isolation
layers along the excavation slope surface from the foundation base after the excavation reaches the specified elevation, and then carrying out stone replacement in
layers; carrying out excavation for the second time on two sides adjacent to the first side of the box culvert foundation along the longitudinal direction of the roadbed and the transverse direction of the box culvert until the excavation reaches the design depth elevation and the preset width, and laying
geotextile isolation
layers on the two sides of the slope of the excavation area, and then carrying out stone replacement in layers; and carrying out backfilling in layers and tamping in layers of the excavation area, carrying out replacement until reaching the designed top elevation, and carrying out tamping and leveling until reaching the construction conditions of a box culvert structure. According to the method, the field construction progress of the
peat soil soft foundation can be accelerated, the
geotextile isolation layers are added, and the
peat soil layer is isolated from stone replacement part, thus avoiding the mixed
impact upon stability of the box culvert foundation.