井筒凍結(jié)法施工的力學(xué)及數(shù)值模擬分析
[Abstract]:Vertical shaft engineering is one of the main chain projects of mine construction and the throat of the whole mine construction. The quality of design and construction is directly related to the success or failure of mine construction and the normal use of production period. In this paper, based on the construction of the shaft freezing method in the Cococo cap mine, the elastoplastic mechanics analysis of the opposite shaft mechanics model is carried out, and the changes of the geo-soil physical properties before and after freezing are analyzed. By means of F L A C 3D numerical simulation software, the mechanical parameters are reduced by engineering method. The deformation of shaft wall and the radial stress change of surrounding rock of shaft are analyzed by numerical simulation under the condition of different number of freezing holes. The number of freezing holes is determined by synthesizing the deformation of shaft and the construction cost of freezing hole in vertical shaft. The main work of this paper is as follows: 1) based on the basic assumption of elastic mechanics, the stress problem of wellbore is simplified, and the characteristics of surrounding rock force and displacement based on elastic assumption are analyzed. The variation trend of stress and displacement in surrounding rock of shaft under different freezing thickness is analyzed, which lays a theoretical foundation for numerical simulation analysis. 2) the hydrogeological condition data of rock and soil are obtained by drilling rock and soil around wellbore. Its main exploration work includes: through drilling rock samples, the lithology of mining area is analyzed, the formation temperature of different depth is obtained, and the variation trend of formation temperature is analyzed. The formation water content is detected by detecting holes, and the horizontal narrow corridor method is used to estimate the wellbore water inflow, which provides the basis for determining the freezing construction method. 3) relevant mechanical experiments are carried out by drilling rock samples. The mechanical parameters of rock samples before and after freezing are measured. The main parameters include compressive strength, tensile strength, cohesion force, friction angle and density. Through engineering treatment, the obtained rock mechanics parameters are transformed into mechanical parameters suitable for numerical simulation experiments, which provide parameters for later numerical simulation. 4) the mechanical parameters after engineering reduction are adopted. The variation trend of freezing thickness under different freezing hole conditions is calculated, and the numerical experimental model of different freezing hole is established, and the sidewall migration under different freezing thickness conditions is calculated by numerical simulation. Combined with the maximum deviation of wellbore and the cost of freezing hole construction, the number of freezing hole is determined. 5) under different excavation depth, under the condition of water cut, the pore pressure of shaft wall is analyzed by F L A C 3D numerical simulation software. It is proved that freezing method can effectively prevent water and reduce hole pressure.
【學(xué)位授予單位】:湖南科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TD262
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