Geocell for load support applications

A technology of geocells and stress, which is applied in soil protection, infrastructure engineering, roads, etc., and can solve problems that have not been widely used

Active Publication Date: 2011-08-24
PRS MEDITERRANEAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Geocells are not widely used in load bearing applications such as roads, railways, parking lots or heavy container storage areas due to their high propensity for plastic deformation at low strains

Method used

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  • Geocell for load support applications
  • Geocell for load support applications
  • Geocell for load support applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] HDPE tapes were extruded and embossed to provide a texture similar to Comparative Example 1. The strip had a thickness of 1.7 mm and was then stretched at a temperature of 100° C. (strip surface temperature) so that its length increased by 50% and its thickness decreased by 25%. The stress-strain response of this HDPE tape was determined according to the Izhar method and is shown in Table 2.

[0101] Table 2

[0102] Stress (MPa)

[0103] The tape of Example 1 maintained an elastic response up to 12% strain at stresses greater than 17 MPa without a yield point and without reaching its plastic limit. After unloading, its initial dimensional recovery rate is close to 100%.

Embodiment 2

[0105] The following high performance polymer blend composition comprising 12% by weight of polyamide 12, 10% by weight of Polybutylene terephthalate, 5% polyethylene grafted with maleic anhydride compatibilizer (Bondyram 5001, manufactured by Polyram Corporation) and 73% HDPE. The stress-strain response of tapes formed from this composition was determined according to the Izhar method and is shown in Table 3.

[0106] table 3

[0107] Stress (MPa)

8

10.8

12.5

13.7

14.5

15.2

15.8

16.5

17.3

Strain (%)

1.9

3.6

5.2

6.8

7.9

8.9

10

12

14

[0108] The tape of Example 2 maintained an elastic response up to 14% strain at stresses greater than 17 MPa without a yield point and without reaching its plastic limit. After unloading, the recovery rate of its original size is close to 100%.

[0109] Figure 5 It is a graph showing the stress-strain results o...

Embodiment 3

[0112] Two cells were tested to demonstrate the improved reinforcement of the granular material and the increased load-bearing capacity. These cells are individual cells, not complete geocells. The cell of Comparative Example 1 was used as a control. For comparison, cells were made from the composition of Example 2, embossed, and had a thickness of 1.5 mm.

[0113]The walls of each cell have a height of 10 cm, a distance between welds of 33 cm, embossing, no perforation, and a thickness of 1.5 mm. The cell is open such that its long "radius" is about 260mm and its short radius is about 185mm. Fill a sandbox 800mm long and 800mm wide to a sand depth of 20mm. See Table 4 for the grade distribution of sand.

[0114] Table 4

[0115] Sieve hole(mm)

0.25

0.5

0.75

1

2

4

Cumulative pass ratio%

10-20

35-55

50-70

60-80

80-90

90-100

[0116] Place the cell on the surface of the above sand ...

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Abstract

A geocell is disclosed that has high strength and stiffness, such that the geocell has a storage modulus of 500 MPa or greater at 23 DEG C; a storage modulus of 150 MPa or greater at 630C when measured in the machine direction using Dynamic Mechanical Analysis (DMA) at a frequency of 1 Hz; a tensile stress at 12% strain of 14.5 MPa or greater at 230C; a coefficient of thermal expansion of 120 x 10'6 /0C or less at 250C, and/or a long term design stress of 2.6 MPa or greater. The geocell is suitable for load support applications, especially for reinforcing base courses and/or subbases of roads, pavement, storage areas, and railways.

Description

Background technique [0001] The present invention relates to a cell reinforcement system (also known as CCS or geocell) suitable for supporting loads such as those found on roads, railways, car parks and pavements. In particular, the geocells of the present invention retain their dimensions over a large number of load cycles and temperature cycles so that the desired filler reinforcement is maintained throughout the design life of the geocell. [0002] Cell Consolidation System (CCS) is a reinforced cell array similar to a "honeycomb" structure filled with granular fillers, which can be cohesive soil, sand, gravel, ballast, crushed stone or any Another type of granular aggregate. CCS (also known as geocells) are primarily used in civil engineering applications that require lower mechanical strength and stiffness, such as slope protection (to prevent erosion), or to provide lateral support for slopes. [0003] CCS differs from other geosynthetics such as geogrids or geotextil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00
CPCE02D17/202E01C11/16E01C3/006
Inventor 伊扎尔·哈拉米奥德艾德·埃雷兹阿迪·埃雷兹
Owner PRS MEDITERRANEAN
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