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A case study of large scale rock mass preconditioning by confined blasting

机译：密闭爆破大规模岩体预处理的案例研究

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摘要

A number of caving operations are expected to be in deposits or geological systems locatedrnat much greater depths than current. These deposits are characterised by strong rock masses and higher stressrnregimes. These conditions will impose greater technical and mining challenges and therefore risks in termsrnof the caving processes, cave establishment and subsequent production. In order to mitigate such potentialrnrisks, rock mass “preconditioning” techniques are being implemented into mine design and planning. The termrn“preconditioning” has been adopted within the mining industry to describe the process of “modifying” a rockrnmass to enable better control or management of the cave mining process. It is currently achieved throughrntechniques such as hydraulic fracturing, confined blasting or a combination of both. This paper summarisesrnthe results of a comprehensive geotechnical; monitoring and advanced blast modelling program involving largernscale confined blasting tests at the first of a series of panel caves in the Cadia East mining complex in New SouthrnWales, Australia. One of the objectives of this program was to obtain information to calibrate and evaluate thernapplication of a newly developed explosive-rock interaction model. Results from the modelling work were usedrnto understand the complex mechanisms at play under fully confined blasting conditions. In addition they helpedrnidentify improvements in explosive charge initiation and blasthole layouts to enhance the extent of rock massrnpreconditioning within the existing mining geometry and production constraints.
机译：预计许多崩落作业将发生在比当前深度大得多的矿床或地质系统中。这些沉积物的特征是坚硬的岩体和较高的应力制度。这些条件将带来更大的技术和采矿挑战，因此在崩落过程，洞穴建立和后续生产方面将面临风险。为了减轻这种潜在风险，正在将岩体“预处理”技术应用于矿山的设计和规划中。采矿业已采用“预处理”一词来描述“修改”岩体的过程，以更好地控制或管理洞穴开采过程。目前，这是通过水力压裂，密闭爆破或两者结合的技术来实现的。本文总结了综合岩土工程的结果。在澳大利亚新南威尔士州的卡迪亚东矿区，在一系列面板洞穴的第一个中，进行了大规模的密闭爆破试验的监测和高级爆破建模程序。该计划的目标之一是获得信息，以校准和评估新开发的炸药-岩石相互作用模型的应用。使用建模工作的结果来了解在完全受限的爆破条件下起作用的复杂机制。此外，他们帮助确定了炸药装药和爆破孔布局的改进，以在现有采矿几何条件和生产限制条件下提高岩体预处理的程度。

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  • 会议地点 Wroclaw(PL)
  • 作者

    I. Onederra; A. Catalan; G. Chitombo;

  • 作者单位

    CRC Mining, University of Queensland, Australia;

    Minera Esperanza, Antofagasta Minerals Group, Chile. Formerly of Newcrest Mining Limited, Australia;

    WH Bryan Mining Geology Research Centre, Sustainable Minerals Institute, University of Queensland, Australia;

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  • 正文语种 eng
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