Coal Bumps Prediction in Longwall Coal Mines

描述（由申请人提供）： 煤柱冲击是煤从一个或多个煤柱中突然猛烈地爆裂。屈服煤柱在犹他州煤田深部矿井的成功应用并不意味着冲击地压不再是一个问题。主要调查人员最近的调查发现，在犹他州煤田经常发生长壁工作面颠簸，特别是在尾板处，有时在头板拐角处，造成人员受伤或有时死亡。然而，还没有研究来解决这个问题。 该建议的主要目的是预测长壁煤矿中的冲击煤。初步研究和以往的研究表明，这一目标可以通过三个阶段来实现。在第一阶段，由于煤岩界面的特性可能是煤矿冲击地压的主要原因，因此将建立煤岩界面摩擦模型。在第一阶段，将进行一系列的直剪试验，通过比较现有的摩擦模型与实验结果，以确定合适的岩/煤摩擦模型。在第二阶段，将开发冲击煤预测模型。在第一阶段中获得的岩/煤界面摩擦模型与主要研究者（Morsy，2003）开发的建模技术相关，将用于估计煤炭冲击。通过一系列单轴压缩试验模拟煤岩冲击的加载条件，通过研究岩/煤界面的损伤过程和煤储存弹性应变能的潜力来验证所开发的煤岩冲击预测模型。在第三阶段，将使用第二阶段开发的冲击煤预测模型进行参数研究。将考虑对煤岩冲击和顺槽系统与长壁工作面之间的应力传递影响最大的参数，例如：岩/煤界面的特性、覆岩深度、顺槽系统的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.