In open-pit mines,pit slope as one of the important parameters affects the mine economy and total minable reserve,and it is also affected by different uncertainties which arising from many sources.One of the most crit...In open-pit mines,pit slope as one of the important parameters affects the mine economy and total minable reserve,and it is also affected by different uncertainties which arising from many sources.One of the most critical sources of uncertainty effects on the pit slope design is rock mass geomechanical properties.By comparing the probability of failure resulted from deterministic procedure and probabilistic one,this paper investigated the effects of aforesaid uncertainties on open-pit slope stability in metal mines.In this way,to reduce the effect of variance,it implemented Latin Hypercube Sampling(LHS)technique.Furthermore,a hypothesis test was exerted to compare the effects on two cases in Middle East.Subsequently,the investigation approved high influence of geomechanical uncertainties on overall pit steepness and stability in both iron and copper mines,though on the first case the effects were just over.展开更多
Power connector, as one kind of fittings, is used to connect power equipmentto conductor, conductor to wire or wire to wire in power lines. Owing to its simple structure, easyinstallation and low cost, bolt-type power...Power connector, as one kind of fittings, is used to connect power equipmentto conductor, conductor to wire or wire to wire in power lines. Owing to its simple structure, easyinstallation and low cost, bolt-type power connector-parallel groove clamp is widely used inoverhead power transmission and distribution line. However, owing to high current load and harshenvironment in China, there are still some problems in application of this kind of connector. So,some failure connectors replaced from domestic overhead power lines are collected. The main reasonsthe failure are given out through investigation into residual contact force, connection resistance,substrate quality, makeup, condition of contact interface and installation, manufacture techniqueetc. Then, the current test on parallel groove clamps is carried out and finite element method isused to simulate its failure process.展开更多
文摘In open-pit mines,pit slope as one of the important parameters affects the mine economy and total minable reserve,and it is also affected by different uncertainties which arising from many sources.One of the most critical sources of uncertainty effects on the pit slope design is rock mass geomechanical properties.By comparing the probability of failure resulted from deterministic procedure and probabilistic one,this paper investigated the effects of aforesaid uncertainties on open-pit slope stability in metal mines.In this way,to reduce the effect of variance,it implemented Latin Hypercube Sampling(LHS)technique.Furthermore,a hypothesis test was exerted to compare the effects on two cases in Middle East.Subsequently,the investigation approved high influence of geomechanical uncertainties on overall pit steepness and stability in both iron and copper mines,though on the first case the effects were just over.
文摘Power connector, as one kind of fittings, is used to connect power equipmentto conductor, conductor to wire or wire to wire in power lines. Owing to its simple structure, easyinstallation and low cost, bolt-type power connector-parallel groove clamp is widely used inoverhead power transmission and distribution line. However, owing to high current load and harshenvironment in China, there are still some problems in application of this kind of connector. So,some failure connectors replaced from domestic overhead power lines are collected. The main reasonsthe failure are given out through investigation into residual contact force, connection resistance,substrate quality, makeup, condition of contact interface and installation, manufacture techniqueetc. Then, the current test on parallel groove clamps is carried out and finite element method isused to simulate its failure process.
