Geotechnical study and analysis of the stability of pit walls

One of the main problems and challenges in the field of geotechnical is excavation and conservation of existing buildings in the vicinity of them. In the case of non-compliance with the appropriate procedures in order to protect deep and the slopes are being built, there is the possibility of causing irreparable damage. Therefore, it is necessary to drill before using the support system side, a secure and stable environment be created to protect the pit walls. There are many methods for stabilizing ring. Such as by nailing, micro-piles, bracing and anchors, retaining structures truss and so on. The purpose of this paper is to examine the range of geotechnical and geological project is a monument in the city of Ardabil. According to the geotechnical characteristics of the site excavation pit wall stability analysis using the software limit equilibrium Geostudio / Slope.w and finite element software Plaxis 2.D. Discussion stability of deep excavation and the use of armed guards to protect the walls of the hollow structures with increasing levels of underground parking have always been important. The overall stability is seen in deformation and deformation of both side walls and the deepening meeting. As well as the stability of the structure in the vicinity of the ring depends on how the plan is calculating prestressing forces. Soil shear strength, hardness wall, angle of inclination, the vertical distances and forces the interlock and control stress and deformation pattern directly on the side wall of the pressure distribution of the wall will affect them. [1] Equations used to calculate the earth pressure and work overload has been proposed. It is known that such relationships Rankine and Coulomb are mentioned. Because of the deformation of the wall, pressure distribution is affected. The use of static pressure is applied to the soil the assumption that the system does not side wall with no deformation. This assumption requires that the wall system with high rigidity and high force applied by prestressing. But designed according to the needs of flexible anchoring system is impractical. [1] When the wall in the middle layer has good resistance parameters, the high pressure side is near the location of checks. And only a small amount around the area has been fixed. Trapezoid pressure curve in the figure following the "Posh apparent earth pressure" and called for the wall inhibitory accepted. And with good approximation the shape and magnitude of pressure after the wall will be estimated. (FHWA GEC. 4 1999)