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Bidirectional reinforcing and water drainage reinforcing means for highway soft soil foundation

A technology for weak soil foundations and highways, applied in soil protection, foundation structure engineering, construction, etc., can solve the problems of piles not being able to drain, reducing foundation settlement, and soil reinforcement between piles is small, so as to improve foundation stability and bearing capacity, reducing foundation differential settlement, and post-construction settlement reduction effects

Inactive Publication Date: 2009-06-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can reasonably play the role of the pile body and horizontal reinforcement, effectively improve the stability and bearing capacity of the foundation, and reduce the settlement of the foundation. Form a complete vertical and horizontal drainage system, so the reinforcement effect of the soil between the piles is small, and the strength of the soil between the piles will not increase with time

Method used

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  • Bidirectional reinforcing and water drainage reinforcing means for highway soft soil foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Level the site, set out the pile positions, arrange piles in plum blossom shape, and the pile spacing is 1.8m.

[0020] (2) The gravel pile 1 is formed by vibro-construction, the diameter of the gravel pile is 0.9m, and the length is 15m;

[0021] (3) Lay the lower drainage layer 2 on the top surface of the gravel pile 1, use gravel (the particle size of the gravel is 2cm ~ 5cm) as the material, and loosely lay the thickness h 1 23cm, layered rolling, thickness ΔH after compaction 1 20cm;

[0022] (4) Lay a geocell with a thickness of 12cm and a drainage hole on the wall above the lower drainage layer 2, fill the room with coarse sand and compact to form the geocell layer 3;

[0023] (5) Lay the upper drainage layer 4 on the geocell layer 3, use gravel (the departure of the gravel is 2cm ~ 5cm) as the material, and loosely lay the thickness h 2 22cm, layered rolling, thickness ΔH after compaction 2 It is 20cm.

Embodiment 2

[0025] (1) Level the site, set out the pile positions, arrange piles in a square, and the pile spacing is 1.2m.

[0026] (2) Utilize the construction of vibrating sinking pipe method to form gravel pile 1, and the diameter of the gravel pile is 0.4m and the pile length is 12m;

[0027] (3) Lay the lower drainage layer 2 on the top surface of the gravel pile 1, use coarse sand as the material, and roll it layer by layer, and the thickness after compaction is 20cm;

[0028] (4) Lay a geocell with a thickness of 18cm and a drainage hole on the chamber wall above the lower drainage layer 2, fill the room with coarse sand and gravel (the volume content of the gravel accounts for 50%) and compact to form the geocell layer 3;

[0029] (5) Lay the upper drainage layer 4 on the geocell layer 3, use coarse sand as the material, and roll it layer by layer, and the thickness after compaction is 20cm.

Embodiment 3

[0031] (1) Level the site, set out the pile positions, arrange piles in plum blossom shape, and the pile spacing is 1.5m.

[0032] (2) The gravel pile 1 is formed by hammering the pipe sinking method, the diameter of the gravel pile is 0.4m, and the pile length is 10m;

[0033] (3) Lay the lower drainage layer 2 on the top surface of the gravel pile 1, use coarse sand as the material, and roll it layer by layer, and the thickness after compaction is 20cm;

[0034] (4) Lay a geocell with a thickness of 15cm and a drainage hole on the wall above the lower drainage layer 2, fill the room with coarse sand and gravel (the volume content of the gravel accounts for 30%) and compact to form the geocell layer 3;

[0035] (5) Lay the upper drainage layer 4 on the geocell layer 3, use crushed stone (the particle size of the crushed stone is 2cm ~ 5cm) as the material, and roll it layer by layer, and the thickness after compaction is 40cm.

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Abstract

The invention discloses a soft soil foundation two-way reinforcement and drainage reinforcement method for highways. The invention comprises the steps as follows: (1) the site is leveled and the pile positions are set out; (2) the construction is carried out by vibroflotation, hammering method, or vibrating tube sinking method to form a gravel pile; (3) the top of the pile is paved with Geocell coarse sand or gravel hardcore, the main composition body thereof is a Geocell layer with drain holes on the wall, the Geocell is filled with compact coarse sand or gravels, and the upper part and the lower part of the Geocell are respectively paved with drainage layers. By adopting the Geocell coarse sand or gravel hardcore and gravel pile two-way reinforcement and drainage structure, the method can realize a composite action of reinforcement, compaction, replacement and drainage on the soft foundation, effectively improve the strength and stability of the roadbed, reduce the differential settlement of the foundation and satisfy the requirement of traffic load increase on the bearing capacity and deformation of the roadbed.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a treatment method for two-way strengthening and drainage reinforcement of weak highway foundations. Background technique [0002] In order to improve the bearing capacity of the foundation and reduce the settlement and deformation of the foundation when constructing expressways in soft soil areas, there are two main types of traditional reinforcement treatment methods: the first type is to use drainage consolidation; the second type is to add reinforcements Reinforcement treatment, which is divided into vertical reinforcement (such as cement mixing pile, CFG pile, plain concrete pile, rotary grouting pile, etc.) reinforcement method and horizontal reinforcement (such as geogrid, geocell , geotextile and other reinforced cushion) reinforcement method. The first type of method is simple in construction and low in composition, and the strength of the foundation soil will increase w...

Claims

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Application Information

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IPC IPC(8): E02D3/00E02D3/08E02D3/10
Inventor 赵明华陈昌富张玲刘晓明邹新军周志军雷勇马缤辉
Owner HUNAN UNIV
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