Research Status and Influencing Factors for the Radon Emanation of Uranium Tailings Impoundment

2011 ◽  
Vol 356-360 ◽  
pp. 1679-1683
Author(s):  
Xiao Yong Peng ◽  
Zhen Hao Liu ◽  
Lin Yao ◽  
Qing Fang Xie ◽  
Fen Wan
Keyword(s):  
Influencing Factors ◽  
Physical Experiment ◽  
Sampling Time ◽  
Theoretical Research ◽  
Radon Emanation ◽  
Research Status ◽  
Management Standards ◽  
Tailings Impoundment ◽  
Migration Mechanism ◽  
Uranium Tailings

The influencing factors on radon emanation rate of uranium tailings storehouse, migration mechanism, theoretical research of the radon emanation and research status of radonmetry were introduced. Reasonable measurement, network, sampling time and measuring times are very necessary to the measurement of radon emanation rate of uranium tailings. Combining numerical simulation, physical experiment simulation and field test, put forward reasonable management standards for decommissioning uranium tailings.

Numerical Simulation of Atmospheric Diffusion of Radon Emanating From Flat Ground Uranium Tailings Impoundment in Different Heights

2012 ◽  
Vol 518-523 ◽  
pp. 1677-1681 ◽  
Author(s):  
Xiao Yong Peng ◽  
Zhen Hao Liu ◽  
Qing Fang Xie ◽  
Xin Zhang ◽  
Fen Wan ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Concentration Distribution ◽  
National Standard ◽  
Radon Emanation ◽  
Atmospheric Diffusion ◽  
Tailings Impoundment ◽  
Effective Doses ◽  
The Difference ◽  
Uranium Tailings ◽  
Flat Ground

The atmospheric diffusion and concentration distribution of radon (emanation rate is 6.06 Bq/m2s ) emanating from the flat ground uranium tailings impoundment at various heights(0m, 10m, 20m, and 30m) are simulated. The numerical results show that the different height of the tailings impoundment will mainly influence the radon concentration that could change in the range of 16~250 Bq/m3 at the downwind region of 0-300m. The radon concentration and annual effective doses for public from radon decrease sharply with the increasing distance away from tailings impoundment, are higher than that of the decommissioned uranium tailings impoundment (its height is 30m, radon emanation rate is 0.74 Bq/m2s ). The annual effective doses for public from radon are highly up to 1.12 mSv/a, and are 0.12 mSv/a greater than the national standard in the range of 800m. Considering the difference of average radon emanation rate and other factors, the protective distance from radon should be adjusted appropriately.

Numerical Simulation of Radon Atmospheric Dynamic Diffusion from a Flat Ground Uranium Tailings Impoundment

2013 ◽  
Vol 807-809 ◽  
pp. 628-631
Author(s):  
Xiao Yong Peng ◽  
Xin Zhang ◽  
Shuai Huang ◽  
Xu Sheng Chai ◽  
Lan Xia Guo
Keyword(s):  
Numerical Simulation ◽  
Mass Fraction ◽  
Space Distribution ◽  
Time And Space ◽  
Tailings Impoundment ◽  
Diffusion Characteristics ◽  
Atmospheric Dynamic ◽  
Uranium Tailings ◽  
Dynamic Diffusion ◽  
Flat Ground

with a flat ground uranium tailings impoundment as the object of the paper, CFD technology was used to study the atmospheric dynamic diffusion characteristics and the evolution of time and space distribution of radon in the uranium tailings impoundment. Results show that, within 1500m range of the leeward of uranium tailings impoundment the falling gradient of radon mass fraction improves with distance increases at the same moment, however the falling gradient flattens with the increase of time gradually; During the first 30 minutes, the radon mass fraction of tailings impoundment in the leeward direction has a larger growth gradient, then flattens out slowly, and stabilizes after 75 minutes.

The Experimental and Theoretical Research on Creep Effect of Large Prestressed Concrete Box Girder

2014 ◽  
Vol 501-504 ◽  
pp. 1199-1203 ◽  
Author(s):  
Ji Xin Yang ◽  
Pei Liu ◽  
Ming Chao Yang
Keyword(s):  
Influencing Factors ◽  
Prestressed Concrete ◽  
Complex Structure ◽  
Internal Force ◽  
Deformation Monitoring ◽  
Theoretical Research ◽  
Box Girder ◽  
Concrete Creep ◽  
Finite Element Software ◽  
Creep Effect

The concrete creep effect is a peculiar phenomenon of concrete material, it has a significant effect on the deformation and internal force redistribution of concrete member, besides, it may cause the loss of prestress , it may have serious consequences especially on complex structure such as long-span bridges. So it must be considered in bridge design and construction. Based on the subject of CYSG deformation monitoring and 32m precast PC simply supported box girder, the method of creep test has been researched and determined in this paper firstly, then the laws of the development of the creep has been summarized, and the influencing factors of concrete creep has been concluded. Using the finite element software ANSYS and the APDL language, theoretical analysis of creep has been carried on in this paper. In conclusion, This paper analyzed the influencing factors of concrete creep and provided the basis for long-term deformation control of creep by comparing the theoretical results with the experimental data.

Factors Analysis about the Dam-Break of the Uranium Tailings

2014 ◽  
Vol 1051 ◽  
pp. 495-499
Author(s):  
Fang Ke Lv ◽  
Yong Liu ◽  
Zan Guo
Keyword(s):  
Safety Monitoring ◽  
Environment Pollution ◽  
Property Damage ◽  
Practical Situation ◽  
Related Factors ◽  
Structure Damage ◽  
Tailings Impoundment ◽  
Factors Analysis ◽  
Hazard Sources ◽  
Uranium Tailings

The uranium tailings is a typical major hazard sources because of its specificity, which could cause serious casualties, property damage and environment pollution in the event of an accident, and thus calls for the attention of everyone. In this paper, we will connect with the practical situation of the uranium tailings, identifying the factors of the dam, such as stability failure of dam slope, overtopping, structure damage, seepage damage and so on. To analyze the related factors and put forward countermeasures based on the analyzed results to control the harmful factors, this will lay the foundation for improving the safety monitoring and security management of uranium tailings impoundment.

Numerical Simulation of Atmospheric Migration of Particles from Uranium Tailings Impoundment

2012 ◽  
Vol 253-255 ◽  
pp. 1014-1018
Author(s):  
Xiao Yong Peng ◽  
Fen Wan ◽  
Qing Fang Xie ◽  
Xin Zhang ◽  
Shuai Huang
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Particle Concentration ◽  
Dust Emission ◽  
Local Concentration ◽  
Discrete Phase Model ◽  
Local Pollution ◽  
Tailings Impoundment ◽  
And Migration ◽  
Uranium Tailings

Based on the discrete phase model (DPM), this paper studies the concentration distribution and settlement regularity of particles which sizes are 10μm and 100μm under the wind speed of 0.5, 1, 2, and 4m/s with the method of numerical simulation. The simulation results show that the particle concentration of 10μm at the downwind direction of tailing is constantly decreasing with the increase of wind speed and migration distance, and the particle concentration of 100μm is gradually increasing, as well as the local pollution also become gradually worse. As wind speed is 0.5m/s, the local concentration of 10μm particles at the beach face of uranium tailings impoundment is higher, and there is much deposition within 2000m of the downwind direction. While the dust emission rate of 100μm is less and its concentration is lower.10μm particles are taken away by the wind, and its concentration would fall rapidly with wind speed increased to 4.0m/s. The concentration of 100μm particle would increase and local pollution becomes more serious.

Studies on Long-Term Deflection of FRP Reinforced Concrete Beams

2013 ◽  
Vol 438-439 ◽  
pp. 811-814 ◽  
Author(s):  
Quan Ji Han ◽  
Hai Tang Zhu ◽  
Hai Bo Cui
Keyword(s):  
Reinforced Concrete ◽  
Influencing Factors ◽  
Calculation Method ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Research Status

The research status and progress, in China and overseas, of long-term deflection of FRP reinforced concrete beams are briefly introduced in this paper. The mechanism, influencing factors and calculation method of long-term deflection of FRP reinforced concrete beams are discussed and summarized. Meanwhile, some advices for long-term deflection research of FRP reinforced concrete beams are proposed.

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