Rahman Sharifi; Hamed Ali
Abstract
There are many different methods to modify the mechanical properties of saturated clayey soils. It may be chosen depending of location and function of the structure. among those methods, preloading in presence of vertical drains and installation of stone columns are similar together and it is the cause ...
Read More
There are many different methods to modify the mechanical properties of saturated clayey soils. It may be chosen depending of location and function of the structure. among those methods, preloading in presence of vertical drains and installation of stone columns are similar together and it is the cause of comparison. In this thesis, each mechanism of modification of soil was studied lonely and then the results of every method were compared with all together. Subsequently the mentioned approaches were graded technicaly. For this reason, a two dimentional finite element software was used to make the models. It should be necessary to forcast the results of choosing one approach, because there is no proper procedure available for engineers to choose one of these method as the first index, and also the long time that must be spent for in situ consolidation.the results show that the finite element program has the ability of simulating the consolidation phenomena in saturated clayey soils and declare that installation of stone columns is better than preloading by installation of vertical drains. Of course, there are many parameters influences the selection of superiority.
Rahman Sharifi; Mohammad Madah
Abstract
Every year one of slope instability that damages the lives of many people would enter the landslide. Therefore, understanding the factors affecting the landslide is one of the most essential measures to prevent landslide damage is reduced. Stability analysis of soil slopes in order to determine the most ...
Read More
Every year one of slope instability that damages the lives of many people would enter the landslide. Therefore, understanding the factors affecting the landslide is one of the most essential measures to prevent landslide damage is reduced. Stability analysis of soil slopes in order to determine the most probable failure surface, ie the lowest confidence level, Geotechnical Engineering is one of the important issues. One key factor which may stability of soil slopes, especially roadside slopes to endanger, there is a landslide or the landslide. soil Geostudio (SLOPE / W) has any impact on the safety factor (F.S) to Shirvani, will be studied. AUTO CAD to design the transverse profiles and the list of calculated volumes and density test have been conducted at the site. Also, using cross sections, the most critical point mode selected and the scope (to drift) software SLOPE / W. And in this regard, with trial and error soil shear strength parameters software has been determined.The results showed that the effect of the natural slope, road construction on slopes with a gradient steeper than 24 degrees reduces slope stability and reliability result in the stability range of solutions slope protection such as the implementation staircase gable (width of stairs 3 meters and the step height of 4 meters 1.25: 1). in this regard, the slope safety factor increased about 28 percent. The results showed trenching operation to a height of 4 meters with a slope of 1:1 stable and 9 meters on the slope of the trench 1:1 becomes unstable. It can be concluded that the operations slope excavation and road margins has a direct effect on the stability of slopes.