Research To Multiple-utilizing Scheme Of Water Resource In Zhongqiaonan Iron Mine

Risk analysis of pit's water inflow and multiple utilization of water resource in Zhongqiaonan iron mine were regarded as disquisitive target,we ascertained hydrological geological perambulation's extent and designed related working content basing on the result of diggings' geologic survey;on basis of multiple analysis and arrangement of field perambulation's datum which included detailed perambulation's report,we summarized area and diggings' geological and hydrological geological condition of the iron mine,established the hydrological geological conceptual model and corresponding numeric simulative model;we forecast water inflow in layer and made correlative risk analysis combining mining's primary scheme;on the basis of analysing water quality's demand and water volume's change of water need in each tache of production,qualification of water quality and process of flow's change of pit's gushing water,in terms of environmental protection and saving of water resource,we calculated mine's producing water requirement and studied multiple-utilizing scheme of water resource.Basing on flow formula of artesian-phreatic well and Monte Carlo method,train of thought of calculating risk probability of pit's water inflow was as follows:making uncertainty analysis,utilizing method of sensitivity analysis ascertianing main risk factors;making random numbers of pit's water inflow;according to Bernoulli theorem calculating risk ratio.For predicting pit's water inflow,numerical method comparing with analytic method more closing to reality,the average of a series of calculational value for pit's yield was 5874.6m~3/d in east ore block at three years,the average was 28895m~3/d in west ore block;in the first situation of west ore block(section 3.2.2.2 for details),risk ratio of pit's yield was 0.4333 to 69298.97m~3/d;in the second condition risk ratio of pit's yield was 0.3144 to 37579.07m~3/d;in east ore block,ratio of sewage and re-use was 78.55% and utilization harmlessly discharging can be achieved for water resources,reliability of water supply for production was 100%,in west ore block the reliability was 100%in the first condition and 99.91%in the second condition.