NEW METHOD FOR YIELD PILLAR DESIGN TO CONTROL COAL BUMPS

煤矿冲击地压已成为严重的采矿问题， 美国在整个世纪。伤亡人数 当这些破坏性事件发生在工作面时， 地雷持续的冲击地压问题不仅威胁着矿工的生命安全， 导致大量煤炭储量的废弃，并导致过早的 矿井关闭。 本课题主要研究长壁煤矿冲击地压的防治。 长壁煤矿留设煤柱巷道设计新方法 将开发用于颠簸和底鼓控制。 实践证明，留设煤柱能有效地防止煤层的冒落 在一些长壁矿井中发生了碰撞所提出的方法将提供一种方法， 稳产支柱设计。为了区分稳定和暴力的失败 岩石，克劳奇和费尔赫斯特（1）和萨拉蒙（2）提出的方法 将用于该方法。为满足这一要求而设计的技术方法 目标包括三个阶段。 在第一阶段中，对采矿实践和与煤炭冲击有关的问题进行了调查， 长壁煤矿将进行。此外，最重要的因素， 有助于煤炭隆起，如地质，几何，地质力学和 将统计地定义挖掘变量。 在第二阶段，该阶段的主要目标是模拟 大三维长壁开采不同阶段留设煤柱系统 有限元模型这些模型只考虑最重要的 第1阶段获得的变量。建模结果将通过现场验证 测量.这些测量将包括支柱应力、支柱 膨胀、屋顶到地板的封闭等。 在阶段3中，使用阶段2中获得的FE建模结果， 将采用多元回归模型，将支柱尺寸与研究变量联系起来， 开发该模型将利用矿山实际案例进行调整和验证 使用产量支柱系统。

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.