松散破碎射气介质的瞬态氡析出能力
Transient Radon Emanation Capability for Loose Fragmented Radon-Emitting Medium
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摘要: 地下原地爆破浸出采场的铀矿堆是一种松散破碎射气介质，其颗粒级配服从Rosin-Rammler分布，它是地下原地爆破浸出采铀矿山井下氡气的主要来源之一。这种介质的瞬态氡析出能力是确定井下需风量和进行氡运移模拟的重要参数，它同时受到介质的特征粒径、粒径分布指数、含水率和瞬时氡浓度的影响。为了研究这种影响，根据Rosin-Rammler分布，选配了不同颗粒级配的7组试样，采用自制的松散破碎射气介质瞬时氡浓度测量装置，进行了瞬态氡析出能力的试验研究，并利用试验结果，采用自适应神经模糊推理系统（ANFIS），建立了根据瞬时氡浓度、特征粒径、粒径分布指数和含水率预测松散破碎射气介质瞬态氡析出能力的ANFIS模型。结果表明，松散破碎介质的瞬态氡析出能力随着含水率的增加而增加，但含水率增加至一定程度后，瞬态氡析出能力会随之降低；所建立的预测松散破碎射气介质瞬态氡析出能力的ANFIS模型，能够给出具有足够精度的预测结果，这为松散破碎射气介质的瞬态氡析出能力的预测开辟了新的途径。Abstract: The uranium ore heap in the stope of underground in-place leaching of fragmented uranium ore by blasting is a loose fragmented radon-emitting medium. Its particle size distribution subordinated to Rosin-Rammler distribution law. The medium is one of the main radon sources in the underground uranium mine, using in-place leaching of fragmented uranium ore by blasting. The transient radon emanation capability of this medium is a very important parameter for determining the amount of fresh air for ventilation and radon discharging in the stope of in-place leaching of a uranium mine and for simulating the radon emanation and transport in loose fragmented radon-emitting medium and is affected by transient radon concentration, characteristic particle size, particle size distribution index and moisture content of the medium.In order to study such influences, a self designed apparatus is used to make tests on seven samples which are compounded by using Rosin-Rammler distribution law and bared on the test results, the adaptive neuro-fuzzy inference system(ANFIS) is used to establish the ANFIS models for predicting transient radon emanation capability.The research results show that the transient radon emanation capability of loose fragmented radon-emitting medium increases with moisture content in the medium, and decreases with the moisture content when it increasese to a certain degree, and that the ANFIS models can give high accuracy predictions and this provides a new path for estimating transient radon emanation capability of loose fragmented radon-emitting medium.
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