Ultimate Bearing Capacity Of Shallow Square Foundation Research

Shallow foundation bearing capacity and deformation of soil mechanics has always been an important and basic element of the engineering. Foundation bearing capacity is defined as to ensure strength, deformation and stability to meet the design requirements of the conditions, the soil's ability to bear the load. Independent foundation under the column with a shallow low-cost, construction equipment and conditions of Convenience, short duration, such as the unique advantages of the project construction has many applications. Widely used at home and abroad are in the two-dimensional plane strain conditions at the Center Export homogeneous foundation under vertical load of the ultimate bearing capacity of strip foundation formula. Engineering practice for the non-linear foundation, tilt, or the role of eccentric loading, etc., are generally used for the introduction of semi-empirical bearing capacity factor to be amended.This paper attempts to conditions in the three-dimensional, it is assumed that the foundation soil belong to the rigid-plastic body and to meet Moore - Coulomb yield criterion, according to static equilibrium equations, it is assumed that the number of basal and spiral smooth sliding surface, calculated separately because of the cohesive force c , overloading q and soil caused by the weight bearing capacity, and then superimposed to get a square shallow foundation formula for calculating the ultimate bearing capacity of foundation.In recent years, numerical simulation technology in geotechnical engineering has been a lot of the development and application. ITASCA Consulting Group from the United States design and development of large-scale geotechnical engineering special software FLAC (Fast Lagrangian of Continua) simulation can be used to achieve the strength of geological materials at the limit or the yield limit of the damage or when the mechanical properties of plastic flow, in particular, apply to Analysis of progressive damage simulation of large deformation and instability.In this paper, FLAC-3D simulation of a square shallow foundation bearing capacity of foundation limit by one group Nγand ? calculate the corresponding value, and second-order fitting matlab Nγ- ? curve, the relationship between the quadratic function.