氡在破碎花岗岩巷道及围岩中的运移机制解析  

Model Analysis of Radon Transportation in Porous Granite Tunnel and Its Adjacent Rock

作　　者：王曙光[1,2] 牛冠毅[1] 宋碧宏[1,3] 杨伟[1] 

机构地区：[1]西北核技术研究所,西安710024 [2]后勤工程学院,重庆401311 [3]重庆大学土木工程学院,重庆400030

出　　处：《地下空间与工程学报》2016年第1期275-280,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金创新群体基金(50921063)

摘　　要：依托某破碎花岗岩巷道工程,以多孔介质中气体的渗流理论为基础,综合考虑影响氡在破碎花岗岩山体及巷道中运移和析出的多种因素,构建了氡的数值计算模型,给出了山体和通风巷道中的氡浓度计算公式,模拟并比较了自然状态和微正压通风状态下山体中氡浓度分布的变化情况,并对微正压通风状态下巷道中氡浓度的变化情况进行模拟和验证。研究结果表明:扩散作用和渗流作用是巷道围岩中氡运移的主要机制;微正压通风条件下巷道中氡的运移主要受通风作用、围岩的射气作用和氡的衰变作用共同影响;微正压通风能够改变围岩中氡的渗流方向,是巷道降氡的有效手段。Mathematical models of radon transportation in granite rock mass and its tunnels were developed based on the theory of gas seepage in porous media. Some aspects on radon transportation and exhilaration were also considered over. Calculation formulas of radon concentration in rock mass and ventilated tunnel were given. Distribution variety of radon in the rock mass in natural and micro positive pressure cases were simulated and compared,and the variety of radon concentration in tunnel in micro positive pressure case was simulated and proved. The results performed that diffusion and seepage were the main mechanism of the radon transportation. Common effect of ventilation,emanation of the rock mass and decay of radon controlled the migration of radon in tunnel in micro positive pressure case,and that the ventilation style was the effective method of radom reduction in tunnel,for the converge of seepage direction of radon in rock mass could be made by the micro pressure.

关 键 词：氡 巷道 运移 数值模型 

分 类 号：O368[理学—流体力学]