Strain behavior of geogrids reinforcing sand under a rectangular footing
الباحث الأول:
Al-Omari, R. R,
الباحثين الآخرين:
Khaled Z. S. M, Sheer Ali T
المجلة:
Japanese Geotechnical Society Special Publication Journal, Vol.2, Issue 67, pp. 2280-2285
تاريخ النشر:
None
مختصر البحث:
An experimental study of the strain behavior of high strength geogrids used to reinforce sandy soil under a 60 x 230
mm rectangular footing is conducted. The effect of two types of geogrids on the bearing capacity of the composite is
investigated …
An experimental study of the strain behavior of high strength geogrids used to reinforce sandy soil under a 60 x 230
mm rectangular footing is conducted. The effect of two types of geogrids on the bearing capacity of the composite is
investigated as well. Three layers of Netlon CE121 and Tensar SS2 geogrids were used. The first layer was
positioned at 0.25B below the footing base while the third layer at a depth of B below the base where B is the footing
width. The main aim of the study is to measure the strain and elongation occurring in the ribs of Tensar SS2 geogrid.
The peak tensile strength of Tensar SS2 geogrid MD/XMD is 14.4/28.2 kN/m and it is 6.4 kN/m for Netlon CE121.
TML strain gauges and other compatible accessories are used. The sand is statically loaded; the relative density was
71.8 % using a raining technique. It is found that the use of geogrids produces a bearing capacity ratio of reinforced
to unreinforced sand of 2.35 and 2.9 for Netlon CE121 and Tensar SS2 respectively. The results revealed also that
the measured strain and elongation in the ribs decrease as the depth of geogrid layers increases and as the horizontal
distance from the footing centre increases as well. The strain in geogrid ribs practically diminishes at a depth of
about the width of footing (B) and at a horizontal distance of about 2.33B from the centerline of footing. A maximum
rib strain of about 0.0001 was measured corresponding to a maximum footing bearing stress of 363 kN/m2.
