长注浆套管对底板变形影响数值分析

发布时间：2018-06-19 14:47

本文选题：注浆 + 套管　；参考：《煤炭工程》2016年09期

【摘要】：大水矿区工作面底板注浆套管布置密度高、长度大,为研究注浆套管对煤层底板岩体变形的影响,运用数值计算软件FLAC3D,结合赵固二矿11030工作面的实际地质条件和套管布置特点,建立数值计算模型,分别模拟分析了套管施加前、后底板破坏和应力变化情况,研究确定了底板注浆加固套管对底板变形的影响程度和控制机理。模拟结果表明,由于套管的阻抗作用,套管处产生局部集中应力,应力场在套管作用下不再对称连续。施加套管后,处于不同区域监测点的垂向位移量分别改变11.5%、29.7%和25%。过渡区内监测点位移改变最大,该区域是控制底板破坏的关键区域。该研究可为类似大水矿区的注浆加固工作提供理论支持,对现场注浆钻孔布置有一定的指导作用。
[Abstract]:In order to study the influence of grouting casing on the deformation of coal seam floor rock mass, the numerical calculation software FLAC3D is used to combine the actual geological conditions and casing arrangement characteristics of 11030 face in Zhaogu No.2 Coal Mine, in order to study the influence of grouting casing on the deformation of coal seam floor rock mass. A numerical model was established to simulate and analyze the failure and stress change of the bottom plate before and after the casing was applied, and the influence degree and control mechanism of the casing strengthened by grouting on the deformation of the bottom plate were determined. The simulation results show that, due to the impedance of the casing, the casing produces local concentrated stress, and the stress field is no longer symmetrical and continuous under the casing action. After applying casing, the vertical displacement at different monitoring points changed by 11.5% and 25% respectively. The displacement of the monitoring points in the transition zone is the largest, which is the key area to control the floor damage. This study can provide theoretical support for grouting reinforcement work similar to Dashui mining area, and has a certain guiding role in the field grouting drilling arrangement.
【作者单位】：华北科技学院安全工程学院;中国矿业大学(北京)资源与安全工程学院;河南能源化工集团焦煤公司赵固二矿;
【基金】：国家自然科学基金资助项目(51504095) 廊坊市科学技术研究与发展计划项目(2016011013) 中央高校基本科研业务费资助(3142015082;3142015002)
【分类号】：TD745

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