Treatment method for thick collapsed loess foundation

A technology of collapsible loess and treatment method, applied in the field of treatment of deep collapsible loess foundation, to achieve the effects of low compression deformation, high bearing capacity and strong water permeability

Active Publication Date: 2008-03-05
SHANXI TRANSPORTATION SCI HIGHWAY SURVEY & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Completely eliminating the collapsibility of these soil layers or completely penetrating the collapsible soil layer will cost a lot of money

Method used

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  • Treatment method for thick collapsed loess foundation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] a) Artificially fill a layer of waterproof cushion 3 on the foundation treatment layer 4, and compact it with lime soil, and the filling thickness is 60cm.

[0016] b) Fill a layer of water-conducting cushion 2 on the waterproof cushion 3, using coarse sandy soil as the material, and the filling thickness is 30cm.

[0017] c) Fill a layer of water-blocking cushion 1 on the water-conducting cushion 2, and compact it with lime soil, with a thickness of 30cm.

[0018] d) Around the foundation treatment layer 4 and at the connection between the upper part and the waterproof cushion 3, build a seepage cut-off wall 5. The seepage cut-off wall 5 is composed of a continuous wall with a width of 50 cm, which can be formed by slotting and backfilling lime soil. The seepage cut-off wall 5 Form a closed water-cutting "hat" shape with the waterproof cushion layer 3, and its depth is 16m; if the total thickness of the foundation treatment layer 4 and the collapsible loess layer 7 is ...

Embodiment 2

[0021] a) Artificially fill a layer of waterproof cushion layer 3 on the foundation treatment layer 4, and use the lime-soil replacement layer and the foundation compaction layer or compacted layer to jointly fill, and the thickness of the upper lime-soil replacement layer is 80cm.

[0022] b) Fill a layer of water-conducting cushion 2 on the waterproof cushion 3, using coarse sandy soil as the material, and the filling thickness is 20cm.

[0023] c) Fill a layer of water-blocking cushion 1 on the water-conducting cushion 2, and use a lime-soil cushion to tamp it densely, with a thickness of 50cm.

[0024] d) Around the ground treatment layer 4, at the junction of the upper part and the waterproof cushion 3, a seepage cut-off wall 5 is built. The seepage cut-off wall 5 is made of a continuous wall with a width of 60 cm, and the seepage cut-off wall 5 uses the DDC method to reinforce the compacted soil method, the cut-off wall 5 and the waterproof cushion 3 form a closed water-...

Embodiment 3

[0027] a) Artificially fill a layer of waterproof cushion 3 on the foundation treatment layer 4, and compact it with lime soil, and the filling thickness is 100cm.

[0028] b) Fill a layer of water-conducting cushion 2 on the waterproof cushion 3, using coarse sandy soil as the material, and the filling thickness is 30cm.

[0029] c) Fill a layer of water-blocking cushion 1 on the water-conducting cushion 2, and use a lime-soil cushion to tamp it densely, with a thickness of 40cm.

[0030] d) Around the foundation treatment layer 4, the upper part and the junction of the waterproof cushion 3 are surrounded by a seepage cut-off wall 5, the seepage cut-off wall 5 is made of a continuous wall with a width of 30 cm, and the seepage cut-off wall 5 is formed by slotting and solidifying mud, The seepage cutoff wall 5 and the waterproof cushion 3 form a closed water-cutting "hat" shape; its depth is 15m; if the total thickness of the foundation treatment layer 4 and the collapsible lo...

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Abstract

The invention relates to a method for treating the deep wet loess ground foundation. First, constructing one layer of waterproof underlay on the treating layer of ground foundation and using ash oil to be filled; using coarse sand to fill one layer of water conductive underlay on the waterproof underlay; constructing one layer of waterproof underlay on the water conductive underlay and using ash soil to be filled; around the ground foundation treating layer, constructing continuous seepage cutoff wall at the connection part between the upper part and the waterproof underlay while said seepage cutoff wall and the waterproof underlay can seal the ground foundation treating layer to enter into the non-wet soil layer; at the outer edge of seepage cutoff wall, vertically drilling and constructing the water guide well and filling the sand in its while the water guide well is through the wet loess stratum to enter in the non-wet soil layer; at last, laying a ring of horizontal water guide tube at the water conductive underlay and around the ground foundation while said horizontal water guide tube is above the water guide well and vertically connected to said water guide well.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a treatment method for deep collapsible loess foundation. Background technique [0002] There are many existing treatment methods for collapsible loess foundations, mainly including the following: [0003] 1) When the soil layer is thin, that is, less than 10m, common methods include soil replacement cushion method, dynamic compaction method, compaction method, etc. When the soil layer is deep, the pre-soaking method or the deep compaction method in the hole is generally used. The pre-soaking method is to deal with the collapsible soil itself through engineering measures, and is suitable for dealing with self-weight collapsible loess foundations. The disadvantage of this method is that the treatment depth is not enough, and it can only eliminate the collapsibility of the soil layer below 6m. It also has high compressibility for the soil layer within 6m of the surface layer, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/02E02D19/18E02D19/20
Inventor 邵生俊王婷邓国华
Owner SHANXI TRANSPORTATION SCI HIGHWAY SURVEY & DESIGN INST
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