浅埋采场上覆岩层孔隙率的时空分布特征

发布时间：2018-05-22 15:00

本文选题：颗粒流理论 + 围岩应力　；参考：《煤炭学报》2017年S1期

【摘要】：流场分布不均常造成采场上覆岩层瓦斯易富集、抽采区域难划分及采空区后方火灾难治理等问题,而上覆岩层在垮落期间的孔隙率分布特征是导致流场分布不均的主要因素之一。根据内蒙古某矿的浅埋煤层的地质资料,利用PFC2D(Particle Flow Code)的黏结颗粒模型(Bonded Particle Model,BPM),借助弹性模量(90组试验)、泊松比(90组试验)、抗压强度(80组试验)及抗拉强度(80组试验)与岩体细观参数之间的关系,建立浅埋煤层模型。对其初次来压期间的上覆岩层的破坏过程、破坏形态、及破坏范围进行了研究,记录并分析采场动态推进过程中,顶底板岩层垂直应力的动态演化特征及孔隙率演化规律。结果表明:利用PFC软件能够很好的模拟上覆岩层垮落过程,其结果与已应用成熟的FLAC模拟相符合。
[Abstract]:The uneven distribution of the flow field often results in the easy accumulation of gas in overburden strata in the stope, the difficulty in dividing the drainage area and the fire disaster treatment behind the goaf, and so on. The porosity distribution of overlying strata during collapse is one of the main factors leading to the uneven distribution of flow field. According to the geological data of shallow coal seam of a certain mine in Inner Mongolia, The model of shallow buried coal seam was established by using the bonded particle model of PFC2D(Particle Flow Code and the relationship between the elastic modulus 90 group test, Poisson's ratio 90 group test, compressive strength 80 group test) and tensile strength (80 group) and the meso-parameters of rock mass. In this paper, the failure process, failure form and failure range of the overlying strata during the initial pressure period are studied, and the dynamic evolution characteristics of vertical stress and porosity evolution of the roof and floor strata during the dynamic stope advancement are recorded and analyzed. The results show that the collapse process of overlying strata can be well simulated by using PFC software, and the results are in agreement with the mature FLAC simulation.
【作者单位】：山东科技大学矿业与安全工程学院;山东科技大学矿山灾害预防控制-省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金面上基金资助项目(51674158) 山东省自然科学基金资助项目(ZR2016EEQ18) 山东科技大学杰出青年科技人才支持计划资助项目(2015JQJH105)
【分类号】：TD325.1

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