Geogrids

Geogrids are very strong in transverse and longitudinal directions, making them useful as reinforcing materials for either soil or solid waste. Generally, they are used to steepen the side slopes of... 

Adpoly HONAM PETROCHEMICAL CORP ADS Geogrid ADVANCED DRAINAGE SYSTEMS ADS Grease Interceptor ADVANCED DRAINAGE SYSTEMS... 

The pile system consists of cement mortar filled plastic casing as piles (Figure 10.2), sand blanket, pile cap, and granular mattress with geogrids layers. 

Design standard BS8006 for embankment, piles and geogrid. 

Partial Safety Factor as recommended by BS8006 for usage of geogrid ... 

Based on these results, the geogrid strength is chosen combined with 300 mm pile caps under the slopes as well as the center of the embankment. The pile rows in the direction of the embankment vary depending on the embankment height. 

Table 10.2. Pile spacing and geogrid for varying embankment heights.

This geogrid is located on the load spreading layer consisting of a 600 mm thick gravel layer. The function of the mattress is three-fold ... 

Improves the shear strength between geogrid and soil. 

The required force in the geogrids will not fluctuate too much over the width of the embankment. 

The BS8006 is use to determine the forces in the geogrids in the piled embankment. However to calculate the loads on the pile caps, a finite element calculation program, such as PLAXIS has to be used to determine loading spreading in the embankment. Then it will be possible to create variations in the pile distance in the cross direction as well. The pile distance and geogrid forces are dictated by the maximum allowable pile load. 

If the bearing capacity of the surface soil layer is not sufficient to allow for interaction with the piles, or if the embankment to be constructed is too high, concrete deck (or also known as piled raft) may be built on the ground surface on top of the piles. Concrete deck or piled raft supported on pile is expansive but will not be as expansive as a flyover structure. Alternatively geosynthetics such as geogrids can be laid on top of the pile cap. Figure 13.6 shows typical cross sections of the pile embankment, i.e. for the case of a pile with RC (reinforced concrete) slab as concrete deck, and piles with individual caps and geosynthetic fabric. 

Jeon HY, Cho SH, Mun MS, Park YM, Jang JW. Assessment of chemical resistance of textile geogrids manufactured with PET high-performance yam. Polymer Test 2005 24 339 5. Koemer R. Should I specify a woven or nonwoven Geotechnical Fabrics Report 1984 2 26-7. 

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