Analysis of Mine Water Mixing Ratio in a Coastal Deposit Based on Power Law
Received date: 2020-06-30
Revised date: 2020-07-20
Online published: 2021-03-22
The study area，Sanshandao gold mine，is the first coastal mine in China.It belongs to structural fissure water-filled mine，and the hydrogeological conditions are complicated.With the mining of the orebody，multiple water inrush accidents occurred in the shallow and deep parts of the mine，causing the partial roadway to be flooded，and even some sections were accompanied by sand erosion.Water inrush caused by coastal mining is an extreme threat to the safe production of the mine.Therefore，it is important to determine the mine water mixing ratios and analyze its evolutionary law for the prevention of water inrush accidents.The power-law rule is a general law shown in the occurrence of geological disasters in nature.It refers to the relationship between the frequency and the scale of disasters.The frequency of large-scale disasters is low.Conversely，disasters with a high frequency of occurrence are relatively small in scale.To determine the measure of the proportion of seawater，the power-law rule was applied to the statistical analysis of the mixing ratios of the mine water in this study area.Firstly，the results of two existing mixing ratio studies were statistically sorted out，and the probability density statistical results of seawater fluctuation events were obtained.Then，the probability density function p（S） was used to fit the fluctuation events of the seawater ratio in two adjacent monitoring periods.Finally，by integrating the fitted curve，the early warning interval of seawater fluctuation value was obtained.The research results show that the correlation coefficients of the fitting reach 0.92 and 0.93，respectively.It indicates that the distribution of the interval mean value and probability density of seawater proportional fluctuation events conformed to the power-law distribution.Thus，it is credible to use the power-law rule to analyze the mixing ratio of the mine water in the study area.For the mixing ratios obtained by different methods，the law reflected under the power law rule is the same.The fluctuation values of the seawater ratio at most monitoring sites are not large，less than 30%.It shows that the power-law rule is not affected by the calculation method of mixing ratio.Because the selected analysis index is the seawater fluctuation value，that is，for the relative value of two monitoring periods，the errors caused by different methods are eliminated.The probability that the fluctuation value of seawater ratio is greater than 48% is less than 5%，so 48% is regarded as the critical value of the warning interval.When the seawater fluctuation value is greater than this value，it should be paid attention to，and combined with the water temperature，flow rate，and other indicators of the water site for further analysis.Water samples near the F3 fault have larger fluctuation values of seawater than that of other water samples because F3 connects the seawater，and due to mining，the water channels around F3 are complicated and unstable.
Key words： coastal mining; water inrush; mixing ratio; evolution law; statistical analysis; power law
Xueliang DUAN , Fengshan MA , Jie GUO , Xin HUI , Hongyu GU , Shanfei WANG . Analysis of Mine Water Mixing Ratio in a Coastal Deposit Based on Power Law[J]. Gold Science and Technology, 2021 , 29(1) : 99 -107 . DOI: 10.11872/j.issn.1005-2518.2021.01.116
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