جستجوی مقالات مرتبط با کلیدواژه "helical multiple anchors" در نشریات گروه "عمران"

In today’s world, roads are considered the main arteries of the global community. One of the most typical methods to build these routes is stabilizing the excavations on two sides of the roads. Using multiple helical anchors in excavation stabilization is one of the means recently used by many road and geotechnical engineers. The increasing use of multiple helical anchors has led to several laboratories, numerical, and field studies. Therefore, this study employed the FLAC 3D software also a three-dimensional numerical investigation of bearing capacity under different inclination angles in sandy soil. In the present study, the effect of soil installation, which is caused by installing helical anchors in the soil, has been studied on the load-bearing capacity of these helical anchors. For this purpose, first, a verification test is done to validate the modeling approach. Then, by performing a parametric analysis, the effect of different inclination angles, as well as the installation effect on the bearing capacity of the multiple helical anchors, are studied. The present study results show that the maximum bearing capacity of the helical anchors is achieved by the angle of 5 and 10 degrees. In addition, by investigating the installation effect, the bearing capacity of the helical anchors has been significantly reduced with respect to the number of helical plates and the density of soil.

Today there are numeral methods for supporting an excavation. Using of helical multiple anchors as excavation support has speared recently. Because of wide range of applications of helical anchors, a massive number of experimental, numerical, and field studies have been carried out. This study works on the pullout capacity of helical multiple anchors by using FLAC 3D software. First, a verification test is carried out in order to confirm the method of simulation. Then, with the help of an extensive parametric study, the effect of different parameters on pullout capacity is observed. This study indicates that sharp growth in loading capacity is observed due to an increase in density of soil and diameter of helical plates. In addition, the results show that changes in the cohesion of soil have a few effects on the loading capacity of helical anchors. Moreover, the share of loading on the plates keeps remain if the space between plates is five times of helical plate diameter and more. In this situation, the failure mechanism is individual plate. Nevertheless, if the space between plates is less than five times of helical plate diameter, the share of loading on the first helical plate (near to excavation) goes up, but the share of loading on the rest helical plates drops dramatically. In this situation, cylindrical shear is the main failure mechanism. Therefore, the current study results demonstrate that the critical space between helical plates is five times of helical plates diameter.