Application of seismic stress inversion to stress field mapping in deep mines

地震应力反演在深部矿井应力场测绘中的应用

• 批准号: 447318-2013
• 负责人: McKinnon, Stephen
• 金额: $ 3.44万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=554531
• 关键词: Application; seismic; stress; inversion; field

The primary tools used for geomechanical mine design are numerical stress analysis codes. Using these tools, the stability of alternative layout and extraction sequences can be examined. The most important input parameters for these stability analyses are rock mass strength and a definition of the in situ stress field. Advances in methods of quantifying rock mass strength have been significant; however, little attention has been paid to characterizing the stress field. Due to the high cost of stress measurement programs and the difficulties in interpreting results, standard practice is to define stresses as linear functions of depth, typically compiled from regional databases of measurements. This approach is used despite evidence of significant departures from this assumption. This simplified approach is seldom recognized as such, yet it seriously undermines the reliability of the stress analysis results. It is particularly problematic in deep, high stress, and seismically active mines, in which the consequences of design uncertainties are greater, and where direct stress measurement is problematic.

地质力学矿山设计的主要工具是数值应力分析代码。使用这些工具，可以检查备选布局和提取序列的稳定性。这些稳定性分析的最重要的输入参数是岩体强度和原地应力场的定义。岩体强度量化方法的进步是显着的，然而，很少有人注意到表征应力场。由于应力测量程序的高成本和解释结果的困难，标准做法是将应力定义为深度的线性函数，通常从区域测量数据库中编译。尽管有证据表明这一假设存在重大偏差，但仍采用了这一方法。这种简化方法很少被承认，但它严重破坏了应力分析结果的可靠性。在深、高应力和地震活跃的矿井中，这是特别成问题的，在这些矿井中，设计不确定性的后果更大，并且直接应力测量是有问题的。