Close-distance coal seams are widely distributed over China, and the coal pillars left by the overlying coal seams affect the retracement channel of the underlying coal seam in the stopping stage. Based on the engineering background of close-distance seam mining in a coal mine, the reasonable position of the underlying coal seam's stopping line and the support method of the large section roadway during stopping are investigated using field measurements, similar simulation experiments, and numerical simulations. There are three types of location relationships between the stopping line of the underlying coal seam and the stopping line of the overlying coal seam: "externally staggered with the upper stopping line" (ESUL, stops mining under the overlying goaf), "overlapped with upper stopping line" (OUL), and "internally staggered with the upper stopping line" (ISUL, ISUL-SD for shorter internal staggered distances, ISUL-LD for longer ones). There are different stress arch structures in the overlying strata of the above three positions, and the stress arch evolution process exists in the process of ESUL → OUL → ISUL-SD → ISUL-LD: a front and rear double stress arch structure → the front arch gradually decreases → the front arch dies out, and the double arch synthesizes the single arch → the single-arch range expands → the nested double arch. The relationship between the stress arch structure and the position of the stopping line is evaluated as follows: (1) ESUL: the stress concentration in the roof plate of the retracement channel of the underlying coal seam is the highest, because the overburden block of the extensive collapse zone acts directly on the roof plate of the retracement channel, resulting in relative difficulties in roof support. (2) OUL: although the retracement channel roof pressure is minimal, the overlying rock structure has the potential for rotation or slippage instability. (3) ISUL-SD: the pressure on the roof of the retracement channel is small and the overburden structure is stable, which is conducive to the safe retraction of the support and not limited by the width of the end-mining coal pillar. (4) ISUL-LD: it is basically the same as the condition of stopping under the non-goaf; however, it has a limitation on the width of the end-mining coal pillar. The location of the stopping line is selected as ISUL-SD, and the retraction process of the self-excavating retraction channel was adopted. A partition asymmetric support scheme which is proven by field practice is proposed, through a comprehensive analysis of the pre-stress field simulation of the support scheme, based on the different control requirements of the roof above the support and the roof of the retracement channel in the stopping area. This method realizes safe and smooth withdrawal of the support.

近距离煤层在我国广泛分布，上覆煤层留下的煤柱在停止阶段影响下伏煤层的回撤通道。基于某煤矿近距离煤层开采工程背景，采用现场实测、类似模拟试验和数值模拟等方法，研究了下伏煤层停车线的合理位置及大断面巷道停车时的支护方法。 . 下伏煤层停止线与上覆煤层停止线存在三种位置关系：“外部与上层停止线错开”（ESUL，在上覆采空区下停止开采）、“与上层停止线重叠”停止线”（OUL）和“ 因为大面积塌陷区的覆盖块直接作用于回撤通道的顶板，导致顶板支护相对困难。(2) OUL：虽然回撤通道顶板压力很小，但上覆岩石结构存在旋转或滑动失稳的可能性。(3)ISUL-SD：回撤通道顶板压力小，上覆结构稳定，有利于支护安全回撤，不受端采煤柱宽度限制。（4）ISUL-LD：与非采空区停车条件基本相同；但是，它对末端采煤柱的宽度有限制。停车线位置选择ISUL-SD，采用自开式回退通道回退工艺。通过对支护方案预应力场模拟的综合分析，针对支护上方顶板和回撤通道顶板的不同控制要求，提出了一种经过现场实践验证的分区非对称支护方案。停车区。该方法实现了支架安全、平稳的撤出。