尾矿库覆土效果参数确定

文章根据氡析出率和覆盖层厚度关系的指数减弱规律原理,在某铀尾矿库222Rn释出率研究和所获得资料的基础上,重点探讨了尾矿库覆土厚度与覆土效果的关系。通过使用实验室和野外实测结果比较相近的两种不同的222Rn析出率测定方法测定了不同容重、尾矿砂不同含水量的条件下的不同覆土层厚度的对降低222Rn析出率的效果,从而确定了在降低天然降水的入渗量的最佳条件下覆土效果参数、覆土后γ辐射水平以及安全粘土覆盖层厚度和费用,为尾矿库的治理设计提供了理论基础。当粘土覆盖层厚度80～120cm,平均厚度为l00cm时,尾矿库滩面氡析出率降低至国家规定限值0.74Bq/m2·s,覆土费用4200～4800万元。

To Determine Thickness of Security Cover Layer in Uranium Tailings

This paper related to the relationship between radon exhalation rate and covering thickness index weakened principle of law, on the basis of radon exhalation rate in uranium tailings and the data obtained,experiments revealed the relationship between tailing covering thickness and covering effect. Through the use of laboratory and field test results but more similar to the two different radon exhalation rate determination method for determination of different density, tail ore under the condition of different content of different thickness of overburden to reduce the effect radon exhalation rate, thereby reducing the amount of precipitation infiltration of the best condition turns the soil parameters, turns the soil after the effect of gamma radiation levels and safety of clay layer thickness and expenses for the management, design of tailings provides theory basis. When the clay overburden thickness is 80～120cm,the average thickness is 100cm. Calculated the radon exhalation rate source when tailings surface radon exhalation are lower limits to the states calculation 0.74Bq/m2·s, the cost of covering is between 42 to 48 million RMB.