新街矿区煤层开采对盾构斜井整体变位影响规律研究

发布时间：2018-10-30 10:30

【摘要】：摘要：盾构工法已经广泛应用于国内外各个领域的长距离、大断面、近水平地下隧道(巷道)施工中,技术成熟,经验丰富。作为一个崭新的课题,本文依托于新街矿区的管片结构斜井,研究盾构工法应用于煤矿建设领域的技术问题。本文采用数值模拟的方法,利用有限元软件MIDAS进行分析。具体的分析过程是,在不同的保护煤柱宽度下,模拟地层结构,进行斜井和煤层的相继开挖,通过软件分析管片受力及位移,进行稳定性的校核和分析。论文针对煤层开采对新街矿区斜井整体变形和位移影响规律及合理保护煤柱宽度的确定展开研究,主要研究工作和取得的成果如下： 1.随着煤层开挖,斜井三个方向上的位移都是逐渐增大。沿斜井水平方向上,斜井整体沿两侧拉伸；垂直于斜井水平方向上,斜井发生轻微的倾斜,而且斜井底部受采动影响更大一些；竖直方向上,斜井中部位移比两侧大,斜井整体呈鱼腹状。 2.对比斜井三个方向上的位移可以发现,斜井是以竖直方向沉降为主,其次是轻微的倾斜,最次是走向方向的拉伸。 3.基于模拟煤层开采引起的斜井管片内力,计算了管片安全系数的变化,并以此为依据确定了斜井合理保护煤柱宽度。 4.建立了不均匀地基上的弹性梁模型,分析了斜井穿越泥岩和细粒砂岩交界处的不均匀沉降的规律。 5.考虑到6000多米长斜井管片间不可避免的变形错动,提出了一种可以抵御地层不均匀沉降的盾构管片连接方法。
[Abstract]:Abstract: Shield method has been widely used in the construction of long distance, large section and near horizontal underground tunnels (roadways) in various fields at home and abroad, with mature technology and rich experience. As a new subject, this paper studies the technical problems of shield construction applied in coal mine construction field based on the inclined shaft of pipe structure in Xinjie mining area. In this paper, the method of numerical simulation and finite element software MIDAS are used to analyze. The concrete analysis process is to simulate the formation structure and excavate the inclined well and coal seam successively under different protecting coal pillar width, and to analyze the force and displacement of segment by software, and to check and analyze the stability. In this paper, the influence of coal seam mining on the whole deformation and displacement of inclined shaft in Xinjie mining area and the determination of reasonable protection of coal pillar width are studied. The main research work and the results obtained are as follows: 1. As the coal seam is excavated, the displacement of the inclined shaft in three directions is gradually increasing. Along the horizontal direction of the inclined well, the whole inclined well is stretched along both sides, perpendicular to the horizontal direction of the inclined well, the inclined well is slightly inclined, and the bottom of the inclined well is more affected by the recovery. In vertical direction, the middle displacement of inclined well is larger than that of both sides, and the whole inclined well is fish-bellied. 2. By contrasting the displacement of the inclined well in three directions, it can be found that the inclined well is mainly vertical settlement, followed by a slight inclination, and the most important is the extension in the direction of strike. 3. Based on the internal force of inclined shaft segment caused by simulated coal seam mining, the variation of safety factor of pipe piece is calculated, and the reasonable protection pillar width of inclined well is determined based on the change of safety factor. 4. The elastic beam model on uneven foundation is established and the law of uneven settlement of inclined well crossing the junction of mudstone and fine-grained sandstone is analyzed. 5. Taking into account the inevitable deformation and dislocation between the pipes of more than 6000 meters long inclined well, a new method of shield segment connection is proposed, which can resist the uneven settlement of the formation.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD821;TD325

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