Coal Bumps Prediction in Longwall Coal Mines

描述(由申请人提供)： 煤块是指从一根或多根煤柱中突然猛烈地喷出的煤。屈服柱在犹他州煤田深部煤矿的成功应用，并不意味着冲击地压不再是问题。主要调查人员最近的调查发现，犹他州煤田经常发生长壁工作面颠簸，特别是在后挡板，有时是在顶门拐角，造成人员受伤或有时死亡。然而，还没有进行任何研究来解决这个问题。 该方案的主要目的是对长壁煤矿的冲击地压进行预测。初步研究和主要研究人员的前期研究表明，这一目标可以分三个阶段实现。在第一阶段，将建立一个岩石/煤界面摩擦模型，因为岩石/煤界面的特性可能是煤矿冲击地压的主要原因。在第一阶段中，将进行一系列直剪试验，通过比较现有的摩擦模型和实验结果来确定合适的岩煤摩擦模型。在第二阶段，将建立一个冲击地压预测模型。在第一阶段中获得的岩石/煤界面摩擦模型与首席研究员(Morsy，2003)开发的建模技术相结合，将用于估计煤的冲击地压。通过模拟冲击地压加载条件的一系列单轴压缩试验，研究了岩/煤界面的破坏过程和煤的弹性应变能储存能力，验证了所建立的冲击地压预测模型。在第三阶段，将利用第二阶段开发的冲击地压预测模型进行参数研究。考虑了影响巷道系统与长壁工作面之间的冲击地压和应力传递的主要参数，如岩煤界面特征、覆岩深度、巷道系统宽度和直接顶底板的刚度。

DESCRIPTION (provided by applicant): Coal bumps are sudden violent bursts of coal from a pillar or pillars. The successful application of yield pillars in deep coal mines of Utah coal field does not mean that coal bumps are no longer a problem. Recent investigation by the principal investigators have found that longwall face bumps, especially at the tailgate and sometimes at the headgate corners, occur routinely in the Utah coal field, causing injuries or sometime fatalities. And yet, no research has been performed to address this issue. The main objective of this proposal is to predict the coal bumps in the longwall coal mines. The preliminarily study and previous researches conducted by the principal investigators show that this objective can be accomplished in three stages. In the first stage, a rock/coal interface friction model will be developed since the characteristics of rock/coal interface can be the prime cause of coal bumps in coal mines. In the first stage a series of direct shear tests will be conducted to identify the appropriate rock/coal friction model by comparing the available friction models with the experimental results. In the second stage, a coal bump prediction model will be developed. The rock/coal interface friction model obtained in the first stage associated with modeling technique developed by the principal investigator (Morsy, 2003) will be used to estimate the coal bumps. A series of uniaxial compression tests simulating the loading conditions associated with coal bumps will be conducted to verify the developed coal bump prediction model by studying the damage processes of rock/coal interface and the potential of coal to store the elastic strain energy. In the third stage, a parametric study will be conducted using the coal bump prediction model developed in the second stage. The most influential parameters on coal bumps and stress transfer between the gateroad system and longwall face will be considered, such as; characteristics of rock/coal interface, overburden depth, width of gateroad system and stiffness of immediate roof and floor.