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Blowing, filling, stacking , loading, precipitating, pre-pressing and strong tamping combined soft soil foundation treating method

A technology of soft soil foundation and construction method, applied in basic structure engineering, soil protection, construction and other directions, can solve the problems of long construction period, difficult construction and high construction cost, and achieve the effect of reducing drainage costs, reducing drainage costs and facilitating construction.

Active Publication Date: 2009-03-04
中交特种工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the soft soil foundation treatment project where the lower layer is a thick and highly compressible silt-like soft soil layer, the upper layer is a thick saturated sand layer, and the soft soil layer needs to be filled again due to the large future settlement of the soft soil layer, the commonly used soft soil foundation treatment Methods, such as vacuum preloading method, surcharge preloading method, vacuum + surcharge combined preloading method, ordinary precipitation dynamic compaction method, etc., all have problems such as difficult construction, long construction period or high cost. Soil foundation treatment method is the need of land reclamation at present

Method used

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  • Blowing, filling, stacking , loading, precipitating, pre-pressing and strong tamping combined soft soil foundation treating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A seaside soft soil foundation treatment project covers an area of ​​150,000 square meters, with a surface layer of 5-7 meters of medium-coarse sand and a 10-13-meter layer of silt-like soft soil underneath, with an average water content of 81.3%. .

[0065] Foundation treatment requirements: the bearing capacity of the foundation is not less than 120kpa, the service load is 50kpa, and the post-construction settlement is not more than 25cm. According to the geological conditions of the site, the combined method of preloading and dewatering preloading and dynamic compaction of the present invention is adopted for processing, and the specific technological process is as follows:

[0066] Insert plastic drainage boards to form a grid of 1.1×1.1m, arranged in a square, with a length of 15-19m.

[0067] Tube wells with a diameter of 600mm are laid out in a grid pattern with a spacing of 50×50m, and the length is 7m.

[0068] Divide the site into 5 treatment areas, each wit...

Embodiment 2

[0076] Subgrade project in a beach area, the treatment area is 50000m 2 , the surface layer is 10m thick soft soil layer.

[0077] Firstly, a 2.5m thick artificial sand layer is laid on the soft soil layer.

[0078] Arrange the plastic drainage board with a plugging machine, the length is 13m, forming 1.0×1.0m 2 grid.

[0079] 41 tube wells with a diameter of 550mm and a length of 6.5m are arranged in the sand layer; at the same time, a cofferdam with a thickness of 0.8m and a height of 2.7m is piled up with bagged sand around the treatment area.

[0080] A layer of geotextile and a layer of waterproof membrane are laid on the surface of the artificial sand layer, and the calculated settlement is about 1.2m.

[0081] Then pile up a sand layer with a thickness of 2.7m, and carry out pumping for 60-70 days.

[0082] When the water level drops to 2.5m below the ground, the settlement is about 1.2m. Start strong tamping. The first two times of big tamping can be point tamping...

Embodiment 3

[0085] A land reclamation project in a beach area along the river, with an area of ​​30,000m 2 , the surface 3m is a medium-fine sand layer, and the underlying soft soil layer is 13m thick.

[0086] Build a mud mixing wall with a thickness of 0.45m and a depth of 3.3m underground around the treatment area at the boundary; use a plug-in machine to arrange plastic drainage boards with a length of 16.5m to form a 1×1m 2 grid.

[0087]15 tube wells with a diameter of 650mm and a length of 6.5m are arranged in the sand layer, and the pumping time is 50-60 days; at the same time, a cofferdam with a thickness of 0.8m and a height of 2.3m is piled up with bagged clay around the treatment area , the calculated settlement is about 2.2m.

[0088] Lay a layer of geotextile and a layer of water-proof membrane on the ground, and then fill the sand layer with a thickness of 2.3m into the cofferdam while pumping water, and carry out preloading and dewatering preloading. The water level drop...

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Abstract

The present invention relates to a construction method for treating a soft-soil foundation, in particular to a construction method combined with hydraulic filling, surcharging, dewatering, preloading and dynamic compaction to treat a soft-soil foundation, which is particularly suitable for a sand dredging and land construction project in a band area with an upper sand layer and a lower soft soil layer along a riverside or a seaside. After a treatment area is delimited, the construction method includes the following steps: (1) vertical water-draining bodies are inserted into the soft soil layer, and a slurry-stirring wall is constructed around the treatment area; (2) dewatering devices are arranged to reduce the level of underground water, meanwhile, a layer of geotextile and a layer of water-insulating film are laid on the sand layer, a cofferdam, under which water-discharging sand channels are arranged, is constructed around the treatment area, and hydraulic filling, surcharging, dewatering and preloading are carried out in the cofferdam; (3) dynamic compaction is carried out after sedimentation is stabilized; (4) after being leveled up, the land is put into use. The construction method for treating the soft-soil foundation has the advantages of low construction cost, short construction period and little post-construction sedimentation.

Description

technical field [0001] The invention relates to the field of civil engineering, and relates to a method for treating soft soil foundations, in particular to a combination method of dredging, filling, dewatering, dewatering, preloading and strong compaction. Background technique [0002] In building construction, the treatment of soft soil foundation is a very important and complicated necessary process for engineering construction. The common treatment methods are mainly divided into 4 categories: the first category, pile foundation method, such as spray pile, mixing Pile, lime pile, vibrating pile, features: high cost, long construction period, and good effect; the second category, drainage consolidation method, such as plastic drainage board + vacuum preloading, high cost, long construction period, low load after treatment; The third category, the traditional dynamic compaction method, has a good effect, but it is not suitable for soft soil; the fourth category, the replac...

Claims

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Application Information

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IPC IPC(8): E02D3/02
Inventor 吴价城吴名江林佳栋
Owner 中交特种工程有限公司
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