Analysis Of The Whole Stability Of Soil-nail Bracing Based On Genetic Algorithm

The paper studies systematically some methods which are applied to analyze the whole stability safety coefficient Fs of soil-nail bracing, and discusses the merit and short-comings of the vertical limit slice methods. A model is erected for Fs with logarithmic spiral sliding surface which can simulate the genuine sliding surface better than others,then the express of Fs is deduced based on the upper bound theorem of limit analisis. The most dangerous sliding surface and the correspending minimum safety coefficient Fs.min of soil nail bracing can be realized with the generic algorithm. And a computing program implemented with visual C++6.0 makes the optimal course, which is very important but trivial and takes much time, into reality.Compared with the calculating results with the "lizheng" software, the calculating results with genetic algorithm are satisfactory. Finally some parameters which are influential in Fs.min are analyzed, and some valuable conclusions are obtained from the analysis for the design and construction of soil-nailing bracing.