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条带式充填采矿法采场扩帮凿岩爆破参数优化研究
- 作者：
严鹏1，2，谷亚州3*，邢星4，李闯3，王长军3，仵锋锋3
- 作者单位：
- （1. 紫金矿业集团股份有限公司；2. 贵州大学资源与环境工程学院；3. 紫金（长沙）工程技术有限公司； 4. 内蒙古汇能人力资源有限公司）
基金项目：
- 国家科技支撑计划项目（2024YFC2909500）
详细信息：
- 作者简介：
- 严 鹏（1986—），男，正高级工程师，博士研究生，从事金属矿山采矿工艺与安全技术研究等工作；E⁃mail：yan. peng@zijinmining. com
- 通讯作者：
- 谷亚州（1996—），男，工程师，硕士，从事采矿与爆破工艺研究等工作；E⁃mail：598930306@qq. com
- PDF下载
Optimization of rock drilling and blasting parameters for stope wall expansion via strip filling method
- English Author：
Yan Peng1，2, Gu Yazhou3, Xing Xing4, Li Chuang3, Wang Changjun3, Wu Fengfeng3
- Unit：
- （1. Zijin Mining Group Co., Ltd.; 2. College of Resources and Environmental Engineering, Guizhou University; 3. Zijin（Changsha）Engineering Technology Co., Ltd.; 4. Inner Mongolia Huineng Human Resources Co., Ltd.）
- 摘要
- 在线预览
- 参考文献
摘要:
地下金属矿山条带式充填采矿法采场爆破后易出现超挖、欠挖及顶板垮落等一系列问题，为精确控制爆破范围，降低采矿损失贫化指标，非常有必要进行爆破参数优化。基于太平洞金矿工程爆破实践，通过岩体力学特性评估与动态破坏过程模拟相结合的技术路径，系统分析不同爆破参数对爆破质量的影响机制，开展采场扩帮凿岩爆破参数优化研究。根据岩石可爆性分级判据指标，得出矿体总体爆破性属于中等至易爆。根据孔底距与最小抵抗线协同优化研究，得出42 mm直径炮孔达到理想岩体破碎形态时，最小抵抗线为0.97～1.26 m，孔底距为1.19～1.55 m，炮孔中心到自由面的距离为0.76～0.99 m。通过ANSYS/LS-DYNA软件构建不同孔底距与最小抵抗线组合的简化计算模型，进行爆炸荷载作用下矿岩破坏特征的数值模拟，得出以下结论：当最小抵抗线大于等于1.0 m时，部分开挖区矿岩破碎质量变差，极易产生大块。为平衡破碎效果与经济成本，最优孔网参数为：最小抵抗线为1.0 m，孔底距为1.23 m，炮孔中心到自由面的距离为0.79 m。
关键词:
条带式；充填采矿法；凿岩爆破；爆破参数；矿岩可爆性；大孔距；小抵抗线
Abstract:
After stope blasting using strip filling method, underground metal mines encounter a series of problemssuch as overbreak, underbreak, and roof collapse. To precisely control the blasting range and reduce mining loss anddilution indicators, it is necessary to optimize the blasting parameters. Based on the engineering blasting practice at theTaipingdong Gold Mine, a systematic analysis of the influencing mechanisms of different blasting parameters on blastingquality was conducted through a technical approach combining mechanical property assessment and dynamic failureprocess simulation of the rock mass. Furthermore, research on optimizing rock drilling and blasting parameters for stopewall expansion was carried out. According to the rock blastability classification criteria, the orebody generally had mediumand easy blastability. Through collaborative optimization research on hole bottom spacing and minimum resistance line,when blast holes with a 42 mm diameter achieved ideal rock mass fragmentation morphology, the minimum resistanceline was 0.97-1.26 m; the hole bottom spacing was 1.19-1.55 m, and the distance from the blast hole center to the freesurface was 0.76-0.99 m. Simplified calculation models with different combinations of hole bottom spacing and minimumresistance line were constructed using ANSYS/LS-DYNA software, and numerical simulations of ore rock failurecharacteristics under explosive loading were performed. The following conclusions were drawn: When the minimumresistance line is greater than or equal to 1.0 m, the fragmentation quality of ore rock in some excavation areasdeteriorates, making it highly prone to generating large blocks. To balance the fragmentation effect and economic costs,the optimal hole network parameters are as follows: minimum resistance line of 1.0 m, hole bottom spacing of 1.23 m,and distance from blast hole center to free surface of 0.79 m.
Keywords:
strip; filling method; rock drilling and blasting; blasting parameter; rock blastability; large hole spac⁃ing; minimum resistance line
