دانلود کتاب مجموعه مقالات ژئوتکنیک زلزله – منتخب هفتمین ICRAGEE 2021

Control of Liquefaction Potential by Geosynthetic Reinforcements—A Study

Abstract: One of the major reasons for collapse of structures during earthquakes is the loss of strength due to generation of excess pore pressure and subsequent liquefaction of saturated sandy soils. The tests carried out on shake table studies indicate that geogrid and geocell can control the liquefaction behavior of sand when same is reinforced with these materials. The tests carried out on saturated sand at relative density of 35% show that average excess pore pressure falls from 3.31 to 2.41 kN/m2 and 2.2 kN/m2 after inclusion of 4 and 5 geogrid layers, respectively, at 0.1 g acceleration. For geocells, the excess pore pressure reduced to 2 kN/m2 at same density and acceleration. With use of geocells, the liquefaction resistance increased by 31.6 at 35% density and 0.3 g acceleration. At 65% density, the liquefaction resistance increased by 26 and 35% with 4 and 5 layers of geogrid and by 41% with use of geocell, respectively. Effect of surcharge was also studied on reinforced sand to simulate actual field conditions. For surcharge of 5.94 kN/m2 at 50% density, the average liquefaction resistance of saturated sand increased by 28 and 37% with 4, 5 layers of geogrid and by 43% for geocells, respectively, at 0.3 g acceleration.