Method for carrying out dynamic compaction treatment on complex site foundation

Abstract

The invention discloses a method for carrying out dynamic compaction treatment on a complex site foundation. Miscellaneous fill on the surface layer of the site is utilized, the dynamic compaction andpower consolidation function is carried out in the tampering manner of column hammer crushing, hammer flattener reinforcing and stage-by-stage energy increase, the foundation surface layer within thedepth range is effectively reinforced to form an overlying crust, and upper loads are borne by the overlying crust and are dispersed into a lower foundation. The method has the beneficial effects that the overlying crust of 3-5 m is formed on the site surface layer, the originally thin part of the overlying crust becomes thicker, the overlying crust with the thickness being relatively uniform isformed on the surface layer of the whole site, the bearing capacity can meet requirements, and meanwhile soft soil on the lower portion of the overlying crust can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of foundation construction, in particular to a method for dynamic compaction to treat complex site foundations. It is especially suitable for intelligent wharf yards with high requirements for total settlement and uneven settlement. Adopting this method can greatly improve the inhomogeneity of the plot and the inhomogeneity of the lower soft soil division, realize the continuous and stable soil foundation structure of the site, and avoid uneven settlement under the premise of meeting the various functional requirements of the storage yard Impact on yard use. Background technique [0002] Complex sites refer to sites with complex causes, long land-forming time span, irregular use, large surface undulations, mostly miscellaneous fills on the surface, and uneven distribution of various soil layers in the foundation. For example, the site was originally an area near the beach, formed by artificial padding, and...

AI Technical Summary

Problems solved by technology

[0003] For the foundation treatment of complex sites, considering that there is a miscellaneous filling soil layer with uneven thickness on the surface of the site, if vacuum preloading treatment is carried out, the miscellaneous filling soil needs to be removed and replaced with plain soil, which requires a large amount of engineering, high cost, and a long project , and the quality of reinforcement is not easy to guarantee; using surcharge preloading treatment, it is also necessary to clear the miscellaneous fill soil before installing the drainage board, and there is a lack of surcharge materials such as mountain soil in this area, the cost is too high, and the construction period is too long; The cement mixing pile composite foundation treatment measures are expensive, and due to the existence of the hard shell of the miscellaneous fill, the construction is difficult; the traditional dynamic compaction process is used, because there are structural layers such as cement stabilized gravel on the surface of the site, so the small compaction energy It cannot be penetrated, and the large tamping can completely disturb the lower soil, and the reinforcement effect is not ideal