Foundation treatment method

A foundation treatment and site technology, which is applied in basic structure engineering, soil protection, construction, etc., can solve the problems of suction hammer, collapsed hole, lost hammer, etc., and achieves the effect of simple construction, broad application prospects, and reasonable technology and economy.

Inactive Publication Date: 2014-04-09
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problems of hole collapse, lost hammer and suction hammer existing in the prior art dynamic compaction construction, and a new foundation treatment method is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) A large area of ​​artificial land was backfilled in a certain sea area. The backfill soil (Q4ml) was taken from the nearby mountain skin soil, yellowish brown, mainly cohesive soil and medium-coarse sand, standard penetration 4 strokes, dynamic detection 1-2 strokes, loose ~ Slightly dense, the backfill soil layer is 1.20-9.80m thick, the groundwater depth is 3.5m, and the bearing capacity is 7-9KPa. Large-scale storage tanks will be built on the site, the base pressure is 220KPa, and foundation treatment is required with a treatment depth of 12m.

[0032] 2) According to the above requirements, through the tamping test, determine the construction control parameters of the dynamic tamping semi-replacement method: tamping energy W= 10000KNm, number of tamping times M=4, tamping point spacing D= 10m.

[0033] 3) During spot ramming, a rammed pit is formed after the second hammer drop of the first pass of spot rammed (M=1, W= 10000KNm), and the pit depth is H= 5m; The ...

Embodiment 2

[0044] 1) A large area of ​​artificial land was backfilled in a certain sea area. The backfill soil (Q4ml) was taken from the nearby mountain skin soil, yellowish brown, mainly cohesive soil and medium-coarse sand, standard penetration 4 strokes, dynamic detection 1-2 strokes, loose ~ Slightly dense, the backfill soil layer is 1.20-9.80m thick, the groundwater depth is 3.5m, and the bearing capacity is 7-9KPa. Large-scale storage tanks will be built on the site, the base pressure is 220KPa, and foundation treatment is required with a treatment depth of 12m.

[0045] 2) According to the above requirements, through the tamping test, determine the construction control parameters of the dynamic tamping semi-replacement method: tamping energy W= 10000KNm, number of tamping times M=4, tamping point spacing D= 10m.

[0046] 3) During spot ramming, a rammed pit is formed after the second hammer drop of the first pass of spot rammed (M=1, W= 10000KNm), and the pit depth is H= 5m; The ...

Embodiment 3

[0057] The same as [Example 2], except that the backfill in the rammed pit is a mixture of the same site backfill material and fresh crushed stone, wherein the weight percentage of crushed stone is 27% of the backfill, and the particle size is ≤50mm.

[0058] Using the above method, the bearing capacity of the foundation reaches 250KPa, the compressive modulus Eo reaches 13MPa, and the average wave velocity of the soil in the Ruili wave velocity test site is 220-280m / s, which meets the purpose of increasing the bearing capacity and reducing the deformation of the foundation, and the soil uniformity of the site is relatively good. it is good. At the same time, no hole collapse, hammer loss and hammer suction occurred during construction.

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Abstract

The invention relates to a foundation treatment method of loose ground soil or large-area backfill ground soil and mainly solves the problems of hole collapse, rammer losing and rammer absorbing in existing dynamic compaction technology construction. The method includes that a dynamic compaction half-replacement method is adopted to perform foundation treatment on a backfill loose ground, a flexible replacement ramming pier is formed by adopting a dynamic compaction construction process and fine-particle filled soil for filling and squeezing-in, and the flexible replacement ramming pier and an original loose soil body form compact uniformly-squeezed replacement bodies radially and vertically; the flexible ramming pier directly depends on continuous point ramming to reinforce the soil body under the pier, and a hard pier bottom bottoming layer is formed. By the technical scheme, the problems are solved well, and the foundation treatment method can be used in construction production needing foundation treatment.

Description

technical field [0001] The invention relates to a ground treatment method. Background technique [0002] The commonly used foundation treatment method for large-scale backfill sites is dynamic compaction. The document CN101205714A discloses a method for treating large stone filling foundations with dynamic compaction. The dynamic compaction method is a traditional and relatively mature foundation treatment method, which is generally divided into two methods: dynamic compaction and dynamic compaction replacement according to different soil properties. The dynamic compaction method is mainly suitable for the treatment of gravel soil, sandy soil, unsaturated fine-grained soil, collapsible loess, plain fill and miscellaneous fill, and its mechanism of action is mainly through the instantaneous The propagation of the shock wave in the soil achieves the effect of vibrating and compacting the soil. The dynamic compaction replacement method is mainly suitable for the treatment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/046
Inventor 何国富
Owner CHINA PETROCHEMICAL CORP
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