Optimization and Comparative Experimental Study of Charge Structure of Water Medium Interval on Open-air Step
Received date: 2023-05-22
Revised date: 2023-07-28
Online published: 2024-01-26
Aiming at the unfavorable blasting effects of the open-air step stripping blasting,such as large blocks and many root bottoms,the blasting effect of the open-air step was optimized by adopting the two-stage charge structure of water medium interval at the bottom of the blast hole and the middle part.To obtain the optimal two-stage charge structure of water medium interval in step stripping blasting of the open-pit mine,the blast hole pressure of the air-medium and water-medium interval charging were discussed from theoretical analysis,the unit consumption of water medium interval charge structure in Wujiata open-pit mine was optimized by experiments.On the basis of the selected optimal unit consumption,three groups of three-dimensional models of different water medium interval charge structure were established by using ANSYS/LS-DYNA numerical simu-lation software.The optimal water medium interval charge structure was selected by analyzing the stress change curve of rock mass,rock mass damage range,and free surface tensile crack area ratio at the bottom of the blast hole,the middle of the lower charge,and the upper position of the blast hole.The blasting effect was evaluated from the index of boulder yield by the blasting comparative experimental with the charge structure of air medium interval.The research results show that blasting with a charge structure of a water medium interval can significantly increase the blasting pressure and improve the rock-crushing effect.The optimal unit consumption of water medium interval charge structure blasting in Wujiata open-pit mine is 0.33~0.34 kg/m3,saving 0.03~0.04 kg/m3 unit consumption of explosives than before. The blasting of a charge structure with an upper water medium interval of 1 m and the lower water medium interval of 1 m has more stress on the rock mass and has a long duration,the damage is evenly distributed along the blast hole,the range is regular,and the free surface tensile crack area accounts for the highest proportion,and its blasting effect optimal.The blasting fragmentation indexes of the optimal water medium interval charge structure all show a good proportion.The research results can provide a reference for the application of water medium interval charge structure in open-pit step blasting.
Honglu FEI , Hainan JI , Jie SHAN . Optimization and Comparative Experimental Study of Charge Structure of Water Medium Interval on Open-air Step[J]. Gold Science and Technology, 2023 , 31(6) : 930 -943 . DOI: 10.11872/j.issn.1005-2518.2023.06.077
自然资源部发布17项行业标准
2023年12月29日,自然资源部发布《矿产资源定期调查规范第1部分:总则》《都市圈国土空间规划编制规程》《测绘成果汇交规范》等17项行业标准,自2024年4月1日起正式实施。这些标准均面向自然资源管理工作实际需求,旨在加强矿产资源开发与保护利用,充分发挥空间规划对推动都市圈高质量发展的积极作用,有利于测绘成果的查询与利用。
《矿产资源定期调查规范》旨在指导矿产资源现状调查,为摸清矿产资源的数量、质量、结构和空间分布状况提供科学支撑,拟由10个部分构成,本次发布5个,包括总则、内业工作、外业工作、潜在矿产资源调查和油气矿产调查。这一系列标准的发布实施,将助力矿产资源现状定期调查、动态更新本底数据库、掌握矿产资源国情国力状况,为矿产资源管理和宏观决策提供依据。《矿产资源“三率”指标要求》旨在明确矿产资源开采、选矿加工和综合利用共伴生矿产应达到的指标要求,拟由15个部分构成,本次发布10个,规定了煤、石油、金和石墨等73种矿产资源的“三率”指标要求,并按照现阶段我国矿产资源开发利用水平由高到低,将“三率”指标依次划分为领跑者指标、一般指标、最低指标,与相关技术标准配套使用。该系列标准的发布实施,将有力推动我国矿产资源全面节约与高效利用、提高矿产资源综合利用效率。
《都市圈国土空间规划编制规程》规定了都市圈国土空间规划的编制要点、成果要求、编制组织与工作流程等主要内容,在促进跨区域大中小城市协调发展和城乡融合发展,推动都市圈高质量发展,提高都市圈整体竞争力,治理大城市病等方面将发挥积极作用。
《测绘成果汇交规范》规范了测绘成果的汇交内容和流程,能够提高测绘成果的汇交效率,将为测绘成果的社会化应用打下坚实基础。
自然资源报)
http://www.goldsci.ac.cn/article/2023/1005-2518/1005-2518-2023-31-6-930.shtml
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