Ground treatment method and specific application

The site where the project is located is in the form of a saturated flow-typed grey sludge, with a sandy interlayer under the silt and a layer of silty clay under the silt. At the time of land formation, 4m thick silt or fine sand was newly filled on the surface of the original silt with a high moisture content and a super soft base. Therefore, in addition to the existing silt and silty clay, the newly reinforced objects of this foundation include freshly-charged silt. This new mud is both a load and itself a compressed layer.

In addition, due to the large processing area of ​​the project, if the preloading is carried out by using a pile, there will be a considerable amount of piled materials, which is facing the problems of the source of the piled materials, the reinforcement cost, and the duration of the reinforcement. Pile preloading method is not the best soft foundation reinforcement method for this project. After many aspects, the project uses vacuum preloading and vacuum preloading in combination with heap loading method to treat soft ground.

The reinforcement scheme divides the longitudinal 1600m wharf coastline into two sections in the north section and the south section in the plane, and then horizontally from the front line of the wharf to the heavy box yard, empty box yard and rear field. The soft foundation treatment vacuum preloading in each area is arranged in blocks of working units, and the north and south sections are simultaneously constructed. The construction in each subarea can be flow operated. After filling the silt or medium fine sand in the land to an elevation of 4.8m, lay a layer of geotextile and geogrid (the geotextile uses 350g/m2 short staple needled non-woven geotextile, with a width of 6m, and the geogrid adopts single Stretch TGDG35 type).

Then blow l2m thick medium coarse sand (less than 5% mud content) and medium fine sand, insert SPB-C type plastic drainage board, drainage plate spacing lm, square layout. The vacuum preloading seal adopts a single-row silt-stirring sealed pile with a design diameter of 700mm. The two piles overlap with each other by 0.20m. It is required that the silt mixing pile must penetrate the air-permeable (water) layer and enter the impervious layer 0.50m. For the northern section of the heavy box area Due to the large thickness of sludge, simple vacuum preloading can not meet the requirements of the use of the load, so the design uses vacuum preloading in combination with the heap load.

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