Study influence of water seepage under the anchor plate in cohesionless soils with and without improvement

This study aims to elucidate the impact of water seepage on the behaviour of an anchor plate that is embedded into cohesionless Al-Najaf soils. Plate anchors are commonly employed in foundation systems to mitigate the risks of overturning and surmounting stresses. A total of twenty-five tests were conducted on a horizontal anchor plate that was embedded at a depth of 30 cm below the surface level of sandy soil. These tests used anchor plates of various forms and sizes. The model tests were categorized into four distinct groups, taking into consideration the existence or non-existence of flow seepage. Furthermore, the tests were conducted on soil samples both with and without geogrid improvement, with variations in shape, compaction, and the addition of cement and lime. Extract from the soil was obtained from Iraq’s AL-Nidaa neighbourhood in the city of AL-Najaf. The values of the reduction in plate capacity due to water flow are (39.4%, 36.7%, 33.4%, 31.9% and 30.8%) for square anchor plate (20 x 20 cm), circular plate with diameter (20 cm), square anchor plate (10 x 10 cm), circular plate with diameter (10 cm) and rectangular anchor plate (10 cm x 20 cm) respectively. The model experiments revealed that the reduction in plate capacity resulting from water flow was 70% for untreated soil, 72% for soil treated with 6% cement, and 20% for soil treated with 6% lime.