Research on radon control performance of covering soil in uranium tailings reservoir under long time high temperature

doi:10.16265/j.cnki.issn1003-3033.2020.03.026

Abstract

Abstract: In order to study variation characteristics of radon control performance of unsaturated covering soil on uranium tailings beach under long time high temperature, with uranium tailings pond as study subject, simulation experiments were carried out by using a self-made experimental device of radon exhalation from covering soil on the beach. Then, relationships between water content, degree of surface fissure development and radon exhalation rate of covering soil were studied with samples of tailing sand at a depth of 1.5 m from a uranium tailings pond in south China. The results show that the change of radon exhalation rate is divided into four stages, linear growth, linear decline, "step" growth and tending to stability. It increases with the increase of fracture rate of covering soil, and tend to be steady when shrinkage limit is reached and crack no longer develops. Moreover, the greater fractal dimension of cracks is, the more obvious soil cracking is, and the greater radon exhalation rate will be.

Key words: covering soil of uranium tailings pond, radon exhalation rate, water content, fracture rate, fractal dimension

CLC Number:

X936

LIU Yan, LIU Yong, XU Zhenghua, HONG ChangshouZHANG Qiucai, YUAN Jinfan. Research on radon control performance of covering soil in uranium tailings reservoir under long time high temperature[J]. China Safety Science Journal, 2020, 30(3): 171-177.

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