Geomechanical data are never sufficient in quantity or adequately precise and accurate for design purposes in mining and civil engineering.The objective of this paper is to show the variability of rock properties at t...Geomechanical data are never sufficient in quantity or adequately precise and accurate for design purposes in mining and civil engineering.The objective of this paper is to show the variability of rock properties at the sampled point in the roadway's roof,and then,how the statistical processing of the available geomechanical data can affect the results of numerical modelling of the roadway's stability.Four cases were applied in the numerical analysis,using average values(the most common in geomechanical data analysis),average minus standard deviation,median,and average value minus statistical error.The study show that different approach to the same geomechanical data set can change the modelling results considerably.The case shows that average minus standard deviation is the most conservative and least risky.It gives the displacements and yielded elements zone in four times broader range comparing to the average values scenario,which is the least conservative option.The two other cases need to be studied further.The results obtained from them are placed between most favorable and most adverse values.Taking the average values corrected by statistical error for the numerical analysis seems to be the best solution.Moreover,the confidence level can be adjusted depending on the object importance and the assumed risk level.展开更多
根据目前中国稀土电解槽生产的实际状况,以8 k A稀土电解槽为研究对象,通过在某工厂实习期间实际测量的电解生产数据和实际生产情况,试图找出对电解生产结果产生重要影响的工艺因素。根据工厂现有设备和条件,确定了对试验结果影响较大的...根据目前中国稀土电解槽生产的实际状况,以8 k A稀土电解槽为研究对象,通过在某工厂实习期间实际测量的电解生产数据和实际生产情况,试图找出对电解生产结果产生重要影响的工艺因素。根据工厂现有设备和条件,确定了对试验结果影响较大的5个因素:电解电压、电解温度、反应时间、阴阳极距、加料频率。围绕这些因素进行正交分析,找出其对生产结果影响重要性的主次关系并确定电解生产的最佳因素组合。结果表明,电解温度在电解过程中起着关键作用,温度把控不好导致电流效率不高且耗能严重,生产效率波动,按最佳工艺参数标准生产的电解槽各方面指标均有了明显提高。展开更多
文摘Geomechanical data are never sufficient in quantity or adequately precise and accurate for design purposes in mining and civil engineering.The objective of this paper is to show the variability of rock properties at the sampled point in the roadway's roof,and then,how the statistical processing of the available geomechanical data can affect the results of numerical modelling of the roadway's stability.Four cases were applied in the numerical analysis,using average values(the most common in geomechanical data analysis),average minus standard deviation,median,and average value minus statistical error.The study show that different approach to the same geomechanical data set can change the modelling results considerably.The case shows that average minus standard deviation is the most conservative and least risky.It gives the displacements and yielded elements zone in four times broader range comparing to the average values scenario,which is the least conservative option.The two other cases need to be studied further.The results obtained from them are placed between most favorable and most adverse values.Taking the average values corrected by statistical error for the numerical analysis seems to be the best solution.Moreover,the confidence level can be adjusted depending on the object importance and the assumed risk level.
文摘根据目前中国稀土电解槽生产的实际状况,以8 k A稀土电解槽为研究对象,通过在某工厂实习期间实际测量的电解生产数据和实际生产情况,试图找出对电解生产结果产生重要影响的工艺因素。根据工厂现有设备和条件,确定了对试验结果影响较大的5个因素:电解电压、电解温度、反应时间、阴阳极距、加料频率。围绕这些因素进行正交分析,找出其对生产结果影响重要性的主次关系并确定电解生产的最佳因素组合。结果表明,电解温度在电解过程中起着关键作用,温度把控不好导致电流效率不高且耗能严重,生产效率波动,按最佳工艺参数标准生产的电解槽各方面指标均有了明显提高。
