压力梯度和温度对多孔射气介质氡析出率影响的试验研究

发布时间：2018-02-15 16:02

本文关键词： 多孔射气介质氡析出率压力梯度温度　出处：《南华大学》2013年硕士论文　论文类型：学位论文

【摘要】：我国铀矿开采始于上世纪60年代，埋藏于浅部的矿产资源大都已被开采，部分矿山已过渡到深部开采。深部开采将会使通风网络内各处静压的不同，加上采空区的增多，，很容易造成通风系统内部的氡渗流析出，改变着各通风空间的氡析出量。研究通风巷道围岩中氡的运移析出，对铀矿井复杂通风网络中风压分布的调整和铀矿井通风降氡排氡的设计具有重大的实际意义和应用价值。本文在国家自然基金项目《铀矿井通风网络中氡及其子体分布的非线性仿真与控制研究》（项目编号：1107571）资助下，将巷道围岩抽象为多孔射气介质，通过在室内建立多孔射气介质氡渗流-扩散析出试验装置，试验研究压力梯度、介质温度对介质表面氡析出率的影响。主要工作如下：（1）实验研究了铀尾矿的镭含量和介质的孔隙率，根据模型试验的相似准则原理，自行设计、研制了多孔射气介质氡渗流-扩散析出的试验装置，很好地实现了对压力的控制和温度的测量。（2）对于本试验装置，在压力梯度小于827.6Pa/m时，高压侧介质表面的氡析出率随压力梯度的增大呈指数下降；低压侧介质表面的氡析出率随压力梯度的增大呈现线性增长；随着压力梯度的继续增大，介质两侧氡析出率趋于稳定。相对而言，介质温度的改变对氡析出率的影响比较小。
[Abstract]:Uranium mining in China began in -40s. Most of the mineral resources buried in shallow areas have been mined, and some of them have been transferred to deep mining. Deep mining will make the static pressure in the ventilation network different, and the number of goaf will increase. It is easy to cause the exhalation of radon in the ventilation system and change the amount of radon exhalation in each ventilation space. It is of great practical significance and application value to adjust the distribution of wind pressure in the complex ventilation network of uranium mine and to design the design of reducing radon and radon in uranium mine ventilation. In this paper, the roadway surrounding rock is abstracted into porous gas medium, supported by the National Natural Fund project "nonlinear simulation and control of radon and its children in uranium mine ventilation network" (project number: 1107571). The effects of pressure gradient and medium temperature on the radon exhalation rate on the surface of porous radiating medium were studied by establishing an experimental apparatus for radon percolation and diffusion in porous gas medium. The main work is as follows:. The radium content of uranium tailings and the porosity of media are studied experimentally. According to the principle of similarity criterion of the model test, an experimental apparatus for radon percolation and diffusion in porous gas medium has been developed. The control of pressure and the measurement of temperature are well realized. 2) for this apparatus, when the pressure gradient is less than 827.6 Pa / m, the radon exhalation rate of the high pressure side medium surface decreases exponentially with the increase of the pressure gradient, and the radon exhalation rate of the low pressure side medium surface increases linearly with the increase of the pressure gradient. With the increasing of the pressure gradient, the radon exhalation rate on both sides of the medium tends to be stable, and relatively speaking, the change of the medium temperature has little effect on the radon exhalation rate.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD72

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