Stress fields in complex rock masses

复杂岩体中的应力场

• 批准号: 261804-2007
• 负责人: McKinnon, Stephen
• 金额: $ 1.46万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=480016
• 关键词: Stress; fields; complex; rock; masses

Stability of mining excavations at depth depends on both rock mass strength and stress conditions. Methods of estimating rock mass strength are relatively well developed, but in contrast, stress conditions are generally estimated from data assembled for entire regions. Although there is documented evidence that stresses can be strongly influenced by local geological conditions, the expense and difficulty of carrying out stress measurement programs has all but precluded their use in practice. Even when measurements are made, stress fields used in design analysis invariably have simplified forms. Certain ground control problems in mines, including seismic events located far from mining excavations, cannot be explained using this simple approach. Other less quantifiable design errors are undoubtedly introduced using this simplification.

深部采矿开挖的稳定性取决于岩体强度和应力条件。估算岩体强度的方法相对成熟，但相比之下，应力条件通常根据整个区域的数据进行估算。虽然有文件证据表明应力会受到当地地质条件的强烈影响，但执行应力测量程序的费用和困难几乎排除了它们在实践中的使用。即使进行了测量，设计分析中使用的应力场也总是具有简化的形式。矿山中的某些地面控制问题，包括远离采矿开挖的地震事件，不能用这种简单的方法来解释。使用这种简化，无疑会引入其他不太可量化的设计错误。