Evaluation of slope stability, especially in the absence of a proper bed such as marine soils, is one of the most important issues in geotechnical engineering. Using geogrid layers to enhance the strength and stability of embankments is regarded as a commendable stabilization method. On the other hand, groundwater level erratically fluctuates in coastal areas. Therefore, the aim of this research is to study the effects of groundwater level changes on stability of a geogrid-reinforced slope on loose marine soils in Qeshm Island, Iran. At first, geotechnical properties of the site were obtained by comprehensive series of geotechnical laboratory and in situ tests. Then, by simultaneous changes of groundwater level and several parameters such as embankment slope, loading, geogrid length, geogrid number, and tensile strength of geogrid, different characteristics such as embankment safety factor (SF), vertical and horizontal displacements at embankment top and embankment base were studied. It was observed that groundwater level had significant effects on behavior of the embankment. For most of the observations, by decreasing the groundwater level, the displacements decreased and consequently safety factor increased. Increasing the length, number, and tensile strength of geogrid led to the reduction of displacements and an increase in the safety factor.@en

The study of a pile behavior on top of the slopes is one of the cases that has been attracted more attention these days. Usually, the behavior of lateral loading piles is studied on the slopes with a range of angles. One of the more important parameters in this field is the lateral bearing capacity of piles. The main aim of this research is to evaluate the lateral bearing capacity of piles under lateral loading. Evaluation of different situation is accomplished by changing the pile length and the pile distance to the slope crest in various slope angles. The pile lateral bearing capacity, horizontal and vertical displacements of the pile head in different slope angles are compared with the flat ground. It is shown that the lateral bearing capacity changes in different slopes are dramatically affected by both the length ratio of the pile to the slope height (L/H) and the distance ratio of the pile from the slope crest (X/D). When the distance ratio of the pile from the slope crest is equal to zero, a great difference is observed from all other cases.@en