大倾角煤层走向长壁伪俯斜工作面开采过程中，支架受载不均衡、摆尾、倒滑现象时有发生，严重制约了该类煤层的安全高效开采，因此对伪俯斜工作面液压支架的受载特征进行深入分析具有重要意义。本文以绿水洞煤矿3132工作面为研究背景，以平行四边形液压支架为研究对象，综合应用物理相似模拟实验、理论分析、数值模拟等方法，探究了大倾角煤层走向长壁伪俯斜工作面矸石滑移充填时空演化规律，量化表征了伪俯斜采场矸石滑移堆积空间展布形态，归纳了矸石滑移堆积影响因素，研究了伪俯斜采场平行四边形液压支架稳定性特征，对比分析了矩形支架与平行四边形支架的应力、变形演化特征，研究表明：

      （1）大倾角走向长壁伪俯斜采场矸石受倾角影响沿倾向滑移，其充填过程分为三个阶段：“初步充填下部区域-矸石倾向下滑-充填‘凹陷’区域”，随着工作面推进，支架后方倾向下部区域出现稳定的矸石充填区域。采空区充填体“接顶区”长度随煤层倾角、直接顶厚度和工作面长度的增大而增大，随伪俯斜角和采高的增大而减小；“临空区”长度随煤层倾角、采高和工作面长度的增大而增大，随伪俯斜角和直接顶厚度的增大而减小。采空区矸石的非对称堆积形态改变了顶板的受力条件与破断特征，使工作面支架的受载也呈现出非对称性和区域性特征。伪斜角的增大使矸石在垮落和充填过程中对支架尾部产生的冲击作用和接触作用更加明显与强烈。

      （2）大倾角煤层伪俯斜工作面中，平行四边形支架相比矩形支架更容易保持稳定，确保支架不发生下滑和转动失稳的临界阻力远小于支架正常工作状态时的工作阻力，且都随着矸石作用力的增大而增大，随着工作面伪斜角的增大而减小。工作面中、下部区域的支架比上部区域支架需要更大的支撑阻力抵抗矸石的影响。

      （3）支架各构件的受力特征反映了支架与围岩之间的相互作用关系以及支架的失稳机理，支架立柱、平衡千斤顶、前后连杆和顶梁-掩护梁铰接点的受载主要与煤层倾角、伪斜角、矸石作用力和顶板载荷作用位置等因素有关，其中伪斜角和顶板载荷作用位置对其影响相对较大。当煤层倾角和伪斜角发生变化时，应适当增大支架立柱工作阻力和平衡千斤顶工作阻力以保持支架稳定，同时应做好顶板管理，防止支架顶梁发生偏载，避免支架结构损坏、支架倒滑等灾害发生。

      （4）大倾角煤层伪俯斜采场中，在顶板载荷作用下，支架的应力和变形具有明显分区域特征，工作面中、上部区域支架应力和变形量相对较大，下部区域支架稳定性较好。伪俯斜工作面中，矩形支架的掩护梁和立柱受载与变形明显，平行四边形支架掩护梁和立柱少有应力集中和变形，结构较为稳定。

      研究结果为大倾角煤层伪俯斜工作面支架结构的优化、平行四边形支架的研发以及现场应用提供了一定的技术支撑与理论指导意义。

       In the mining process of long wall pseudo downdip working face in the strike of large dip coal seam, the unbalanced load of support, tail swing and backward sliding occur from time to time, which seriously restricts the safe and efficient mining of this kind of coal seam. Therefore, it is of great significance to deeply analyze the load characteristics of hydraulic support in pseudo downdip working face. Taking 3132 working face of lvshuidong coal mine as the research background, taking the parallelogram hydraulic support as the research object, and comprehensively applying the methods of physical similarity simulation experiment, theoretical analysis and numerical simulation, this paper explores the temporal and spatial evolution law of gangue sliding and filling in the strike long wall pseudo downdip working face of large dip coal seam, quantitatively characterizes the spatial distribution form of gangue sliding and accumulation in the pseudo downdip stope, and summarizes the influencing factors of gangue sliding and accumulation, The stability characteristics of parallelogram hydraulic support in pseudo downward inclined stope are studied, and the stress and deformation evolution characteristics of rectangular support and parallelogram support are compared and analyzed. The main conclusions are as follows:

      (1) The gangue in the large dip strike longwall pseudo downdip stope slides along the dip affected by the dip. The filling process is divided into three stages: "preliminary filling of the lower area - gangue dip - filling of the 'depression' area". With the advance of the working face, a stable gangue filling area appears in the lower area behind the support. The length of Gob Filling "roof connecting area" increases with the increase of coal seam inclination, direct roof thickness and working face length, and decreases with the increase of pseudo dip angle and mining height; The length of "free area" increases with the increase of coal seam inclination, mining height and working face length, and decreases with the increase of pseudo dip angle and direct roof thickness. The unsymmetrical accumulation form of gangue in goaf changes the stress conditions and breaking characteristics of roof, so that the load of working face support also presents unsymmetrical and regional characteristics. The increase of pseudo slope angle makes the impact and contact effect of gangue on the tail of support more obvious and strong in the process of collapse and filling.

      (2) In the pseudo downward inclined working face of large inclined coal seam, the parallelogram support is easier to maintain stability than the rectangular support. The critical resistance to ensure that the support does not slide and rotate instability is far less than the working resistance of the support in the normal working state, and increases with the increase of gangue force and decreases with the increase of pseudo inclined angle of the working face. The supports in the middle and lower areas of the working face need greater support resistance than those in the upper area to resist the influence of gangue.

      (3) The stress characteristics of each component of the support reflect the interaction relationship between the support and surrounding rock and the instability mechanism of the support. The load of the support column, balance jack, front and rear connecting rods and the hinge joint of roof beam shield beam is mainly related to factors such as coal seam inclination angle, pseudo inclination angle, gangue force and roof load action position, among which the pseudo inclination angle and roof load action position have a relatively large impact. When the inclination angle and pseudo inclination angle of the coal seam change, the working resistance of the support column and the working resistance of the balance Jack should be appropriately increased to maintain the stability of the support. At the same time, the roof management should be done well to prevent the eccentric load of the support top beam and avoid the damage of the support structure, the sliding of the support and other disasters.

       (4) In the pseudo downdip stope of large dip coal seam, under the action of roof load, the stress and deformation of the support have obvious regional characteristics. The stress and deformation of the support in the middle and upper areas of the working face are relatively large, and the stability of the support in the lower area is good. In the pseudo inclined working face, the load and deformation of the shield beam and column of the rectangular support are obvious, while the shield beam and column of the parallelogram support have little stress concentration and deformation, and the structure is relatively stable.

       The research results provide some technical support and theoretical guidance for the optimization of support structure, the research and development of parallelogram support and field application of pseudo downdip working face in large dip coal seam.

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