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为了研究范各庄煤矿12煤层底板开采扰动下,裂隙形成、扩展到突水通道最终贯通形成突水的全过程,以范各庄水文地质条件为基础,建立了承压水上采煤的岩体水力学模型,应用岩石破裂过程渗流-应力耦合分析系统(RFPA~(2D)-Flow)模拟,通过对损伤区分布、应力场和渗流场的演化进行分析,揭示了开采扰动及水压驱动下完整泥岩底板由隔水岩层到突水通道的演化过程,对突水通道进行模拟定位,并对不同水压条件下含水砂岩层对底板突水的影响进行了分析探讨。结果表明:12煤顶板突水问题取决与含水砂岩中的水压力,在假设隔水层厚度不变时,水压力与突水系数呈负相关关系,随着水压的增大突水越易发生。该研究对12煤底板突水预测与防治提供了理论依据。
In order to study the whole process of water inrush caused by the mining of 12 coal seam floor in Fangezhuang Coal Mine, the fractures are formed and extended to the whole process of water inrush leading to water breakthrough. Based on the hydrological and geological conditions in Fangezhuang, Mechanics model was established. The RFPA ~ (2D) -Flow model was used to simulate the rock burst process. By analyzing the distribution of damage zone, the evolution of stress field and seepage field, The water inrush channel was simulated by the evolution of water-rock strata to the water-bursting channel in the mudstone floor, and the influence of water-bearing sandstone layer on the floor water inrush under different water pressure conditions was analyzed and discussed. The results show that the problem of water inrush in coal seam 12 depends on the water pressure in water-bearing sandstones. Under the assumption of constant thickness of water-retaining layer, the water pressure and water inrush coefficient have a negative correlation, and water inrush becomes more prone to occur with the increase of water pressure . This study provides a theoretical basis for the prediction and prevention of water inrush from 12 coal floor.