NEW METHOD FOR YIELD PILLAR DESIGN TO CONTROL COAL BUMPS

煤矿的颠簸给当地带来了严重的采矿问题。 整个20世纪的美国。死亡和受伤人数 当这些破坏性事件发生在采掘工作面时 地雷。持续的冲击矿压问题不仅威胁到矿工的安全，而且还 导致大量煤炭储量的放弃，并导致过早 矿场关闭。 本课题主要研究长壁煤矿的冲击地压防治问题。 长壁煤矿利用屈服柱进行巷道设计的新方法 将被开发用于颠簸和底鼓控制。 目前应用屈服柱的实践表明，它可以防止煤的产生。 在一些长壁煤矿里发生了颠簸。建议的方法将提供一种方法 稳产矿柱设计。区分稳定的失败和剧烈的失败 岩石，这是克劳奇和费尔赫斯特提出的方法，(1)和萨拉蒙(2) 将在此方法中使用。为满足这一要求而设计的技术方法 目标包括三个阶段。 在第一阶段，调查#年与采煤颠簸有关的采矿做法和问题 开展长壁煤矿开采。此外，最重要的因素是 造成煤的颠簸，如地质、几何、地质力学和 挖掘变量将以统计方式定义。 在阶段2中，此阶段的主要目标是模拟 大三维长壁开采不同阶段屈服柱系统 有限元模型。这些模型将只考虑最重要的 在第一阶段获得的变量。建模结果将通过现场验证 测量。这些测量将包括矿柱应力、矿柱应力的变化 膨胀、房顶到楼层关闭等。 在阶段3中，使用在阶段2中获得的有限元建模结果， 将矿柱大小与研究变量关联起来的多元回归模型将是 发展起来的。利用矿山实际案例对该模型进行了调整和验证 使用屈服支柱系统。

Coal mine bumps have presented serious mining problems in the United States throughout the 20th century. Fatalities and injuries have resulted when these destructive events occurred at the working faces of the mines. Persistent bump problem not only threaten the safety of miners, but also have caused the abandonment of large coal reserves and have led to premature mine closures. This research project focuses on coal bumps prevention in long-wall coalmines. A new method for gate-road design using yield pillar in long-wall coalmines will be developed for bumps and floor heave control. Current practice of yield pillars application shows that it can prevent coal bumps in some long-wall mines. The proposed approach will provide a method for stable yield pillar design. To differentiate between stable and violent failure of rocks, an approach proposed by Crouch and Fairhurst, (1) and Salamon (2) will be used in this method. The technical approach designed to meet this objective comprises three phases. In Phase 1, a survey of mining practices and problems related to coal bumps in long-wall coal mines will be conducted. Also, the most significant factors that contribute to coal bumps, such as geological, geometrical, geomechanical and mining variables will be defined statistically. In Phase 2, the main objective of this phase is to simulate the performance of yield pillar system at different stages of long-wall mining using large 3-D finite element models. These models will only consider the most significant variables obtained in Phase 1. Modeling results will be verified by field measurements. These measurements will include changes in pillar stress, pillar dilation, roof-to-floor closure, etc. In Phase 3, using the FE modeling results obtained in Phase 2, a multi-regression model correlating the pillar size to studied variables will be developed. This model will be adjusted and verified using actual cases of mines using yield pillar systems.