The invention relates to a foundation treatment method, in particular to a foundation
dynamic compaction and replacement combined
dynamic compaction reinforced construction method. The method comprises the steps that a construction area is dug, wherein at the bottom elevation of -0.9 m of a box
culvert foundation, and aiming at improving the bearing force of a foundation obtained after box
culvert foundation
dynamic compaction treatment, the original ground is dug for 2.5 m, and then construction of dynamic compaction is started; sloping is carried out on the gradients of the two sides of a foundation trench according to the proportion of 1:1.5; according to the geologic features of a backfill sand
land area of an iron and steel base, a 4,000KN.m dynamic compaction and replacement process is adopted for reinforcing a deep soil layer of 3 m to 9 m, and the foundation bearing force of the deep soil layer is improved; after dynamic compaction and replacement are completed, 3,000KN.m dynamic compaction is used for reinforcement, a deep soil layer of 0-6 m is reinforced, the foundation bearing force of the shallow soil layer is improved, the strength of a substratum soil layer of 0-2.3 m on the bottom face of a box
culvert is improved, and therefore soil is reinforced in the vertical direction; flower arrangement is adopted in
pile point arrangement, that is, dynamic compaction reinforcement is carried out between compaction points obtained after dynamic compaction and replacement, soil between piles is transversely compact, and therefore the foundation bearing force of the soil between the piles is improved, and the soil is reinforced in the transverse direction. As for large-area foundation treatment, construction speed is high, and limitation is small.