工作面边界应力分布规律为矿山压力的重要组成部分，其动态分布特征对于工作面及巷道围岩稳定性的控制至关重要。受地质覆存条件、采掘空间位置关系、煤岩物理力学性质等多因素影响，边界应力动态分布特征复杂多样。

在浅埋近距离煤层开采过程中，遗留煤柱集中应力对下伏煤层开采影响显著。以大柳塔煤矿活鸡兔井下伏2-2煤层22206工作面开采为工程背景，当间隔岩层存在双关键层，以及上覆存在遗留煤柱，且遗留煤柱角度各异时，揭示其对工作面边界应力分布规律的影响研究。

研究表明：（1）遗留煤柱下区段煤柱变形特征与采空区下区段煤柱变形特征的差异为：①超前支承压力影响范围增大约一倍，应力最大值增大15%；②应力变化阶段与应变变化阶段无法对应；③应变增长为“台阶式”。（2）两边弹性固支边界、两边弹性简支边界的弹性薄板力学模型，在非线性荷载Q作用下，工作面位于遗留煤柱影响范围0m、20m、40m、60m时，基本顶初次断裂的空间顺序为：工作面前方煤壁侧—工作面后方煤壁侧—实体煤侧—工作面中部—煤柱侧，斜交遗留煤柱的角度对基本顶的破断特征有影响。（3）通过理论分析与数值模拟，对遗留煤柱不同角度下底板应力分布特征分析，得出：上覆采空区下方至遗留煤柱下方，遗留煤柱角度的变化对底板垂直应力的影响分为三个阶段；第一阶段，遗留煤柱角度为0°~45°范围内影响最大，转变为影响最小；第二阶段，遗留煤柱角度为45°~75°范围内影响次之，且随之X的减小，遗留煤柱角度对底板垂直应力的影响基本不变；第三阶段，遗留煤柱角度为75°~90°范围内影响最小，转变为影响最大。（4）遗留煤柱影响下工作面边界应力分布规律分为四个阶段，第一阶段：主要受到角度较小的遗留煤柱的影响，第二阶段：主要受到角度居中的遗留煤柱的影响，第三阶段：主要受到角度较大的遗留煤柱的影响，第四阶段：随着高位关键岩层的断裂，各自的应力高峰以断裂线为界向相反的方向再次发展。

The stress distribution law at the working face boundary is an important component of mine pressure, and its dynamic distribution characteristics are crucial for the stability control of the working face and surrounding rock of the roadway. Affected by multiple factors such as geological storage conditions, the spatial relationship of mining and excavation, and the physical and mechanical properties of coal and rock, the dynamic distribution characteristics of boundary stress are complex and diverse.

During the mining of shallow-buried close coal seams, the concentrated stress of the remaining coal pillar has a significant impact on the mining of the underlying coal seam. Taking the mining of the 2-2 coal seam 22206 working face in the lower part of the Lixiatai Coal Mine's Huojituxi as the engineering background, when there are double key strata in the interlayer and there are remaining coal pillars in the overlying strata with different angles, the influence of these factors on the stress distribution law at the working face boundary is studied.

The research shows that: (1) The deformation characteristics of the coal pillar in the lower section of the remaining coal pillar and the coal pillar in the lower section of the goaf are different: ① The influence range of the advanced support pressure increases by about one time, and the maximum stress increases by 15%; ② The stress change stage and the strain change stage cannot be matched; ③ The strain growth is "step-like". (2) Under the nonlinear load Q, when the working face is located at 0m, 20m, 40m, and 60m within the influence range of the remaining coal pillar, the spatial sequence of the initial fracture of the basic roof for the elastic thin plate mechanics models with both sides elastically fixed and both sides elastically simply supported is: the coal wall side in front of the working face - the coal wall side behind the working face - the solid coal side - the middle of the working face - the coal pillar side. The angle of the remaining coal pillar intersecting obliquely has an impact on the fracture characteristics of the basic roof. (3) Through theoretical analysis and numerical simulation, the stress distribution characteristics of the floor under different angles of the remaining coal pillar are analyzed, and it is concluded that: from the area below the overlying goaf to the area below the remaining coal pillar, the influence of the change in the angle of the remaining coal pillar on the vertical stress of the floor is divided into three stages; in the first stage, the influence is the greatest when the angle of the remaining coal pillar is within the range of 0° to 45°, and then it becomes the smallest; in the second stage, the influence is the second greatest when the angle of the remaining coal pillar is within the range of 45° to 75°, and as X decreases, the influence of the angle of the remaining coal pillar on the vertical stress of the floor remains basically unchanged; in the third stage, the influence is the smallest when the angle of the remaining coal pillar is within the range of 75° to 90°, and then it becomes the greatest. (4) The stress distribution law at the working face boundary under the influence of the remaining coal pillar is divided into four stages: in the first stage, it is mainly affected by the remaining coal pillar with a smaller angle; in the second stage, it is mainly affected by the remaining coal pillar with a medium angle; in the third stage, it is mainly affected by the remaining coal pillar with a larger angle; in the fourth stage, with the fracture of the high-position key rock strata, the respective stress peaks develop again in opposite directions with the fracture line as the boundary.

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