Li Lingyu, Zhang Chuanqing, Yang Fanjie, Fang Zhi
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China.
J Environ Radioact. 2025 Jan;281:107577. doi: 10.1016/j.jenvrad.2024.107577. Epub 2024 Nov 30.
Radon penetrates into the underground caverns through the pores/fissures of the surrounding rock, resulting in high radon concentration area and endangering the health of construction personnel. The on-site monitoring of radon concentration in the underground powerhouse of Tuoba Hydropower Station is conducted in order to study the radon concentration level. The radon transport during the construction period of underground powerhouse under forced ventilation is established by Computational Fluid Dynamics (CFD) numerical simulation method. Furthermore, the distribution characteristics and long-term evolution law of radon concentration in underground powerhouse are revealed, and reasonable ventilation optimization measures are put forward and the results show that: (1) Blasting promotes the increase of radon concentration, while forced ventilation accelerates radon transport. (2) The airflow field along the axis is divided into a vortex distribution zone, a vortex influence zone and stable regions. (3) The radon transport includes both migration and diffusion processes based on forced ventilation. (4) The radon concentration decreases with the increase of height, while exhibits low concentration in the middle and high concentration on both sides at the same height. (5) Compared with forced ventilation, the combined ventilation can improve the ventilation efficiency and shorten the radon transport time. The research results can provide a scientific basis for the safety analysis and evaluation of deep engineering environment.
氡气通过围岩的孔隙/裂隙渗入地下洞室，形成高氡浓度区域，危及施工人员健康。为研究氡浓度水平，对托巴水电站地下厂房进行了氡浓度现场监测。采用计算流体力学（CFD）数值模拟方法建立了地下厂房施工期强制通风条件下的氡气输运模型。进而揭示了地下厂房氡浓度的分布特征和长期演化规律，提出了合理的通风优化措施，结果表明：（1）爆破促使氡浓度升高，而强制通风加速氡气输运。（2）沿轴线的气流场分为涡旋分布区、涡旋影响区和稳定区域。（3）基于强制通风，氡气输运包括迁移和扩散过程。（4）氡浓度随高度增加而降低，在同一高度处中间浓度低、两侧浓度高。（5）与强制通风相比，联合通风可提高通风效率，缩短氡气输运时间。研究结果可为深部工程环境的安全分析与评价提供科学依据。
