Reliability Analysis And Optimization Design Of The Wind Shaft Wall In GanSu Xin Zhuang

In recent years, the focus of mines construction in China has been transferred to the west and faces complicated geological condition. Well bore often goes through soft rock with different thickness.The soft rock has poor cementation and low strength, gets soft when meeting water.It has pore development but after freezing its strength increases. Because of the properties mentioned above freezing method should be used to construct these mines. In the condition of lacking theoretical guidance and practical experience, designing the mines in the west will not make a reasonable result with the application of the experiences in the eastern region which has deep topsoil. So carrying out the research on freezing mines structure in the west has important theoretical value and practical significance.On the basis of the limitations of traditional design method of borehole wall,the paper discussed the permanent pressure, temperature stress, freezing stress, hydrostatic pressure and additional force and other loads on the frozen wall.The paper has taken the wind shaft in GanSu Xin Zhuang as the practical engineering background, to take the principle and method for reliability calculation as the theoretical basis and systematically analyzing the superiority of the genetic algorithm of reliability calculation. Considering borehole wall at different stages of stress distribution, to establish a reliability analysis model which is adapted to the western wall of freezing method construction is established. Using genetic algorithm toolbox of MATLAB, and drawing up the function model to realize the genetic algorithm. By using the theory of reliability calculation methods,this paper analizes the design and reliability of the wind shaft wall structure in GanSu Xin Zhuang. Using ANSYS finite element software to simulate the original and optimization design of the borehole wall, as well as the maximum displacement and maximum stress.Calculation results show that:By using the reliability design method and calculation model established in this paper which is optimized under the precondition of ensuring the wall structure safety and reliability than conventional design result. It provides reference for similar projects.