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深部复杂工作面围岩−支架动态耦合关系及智能调控策略

Dynamic coupling relationship of surrounding rock-support and intelligent control strategy for deep and complex working faces

  • 摘要: 深部复杂条件煤层开采地应力高, 围岩变形破坏严重, 走向和倾向倾角起伏变化大。工作面不同位置的围岩压力、空间形态差异显著, 支护技术条件复杂。现有工作面支护装备多为单一、固定功能参数设计, 对围岩动态变化的适应能力不足, 难以满足复杂条件煤层智能化开采需求。以淮南矿区某示范煤矿千米深井厚煤层超长工作面为例, 提出了工作面围岩−支架力耦合(大小、方向和作用点)分析和空间态势、位移耦合分析方法, 揭示深部超长工作面覆岩分区破断、压力动态迁移时空演化特征及规律, 构建了基于深度学习神经网络的“压力−位姿”融合预测模型, 提前预测和判断工作面围岩和装备的力位状态; 基于非参数聚类算法提出了液压支架工作阻力和位姿分区准则, 建立了不同分区的支护和位姿控制方法; 研发了复杂条件工作面“三测两控一平台”智能分析决策系统, 实现围岩状态、装备压力和空间信息的综合感知及决策控制, 大幅提升装备适应煤层条件渐变或突变扰动的能力。示范工作面应用结果表明: 系统有效提升复杂条件工作面支护装备的适应性和灵活性。在采用超长工作面布置, 采高范围5.0~6.2 m、倾向平均倾角14°、走向最大倾角17°条件下, 平均每天割煤5刀, 开采速度提升38.29%。示范应用3个月, 推进210.2 m, 采煤总量近60万t, 实现了淮南地区深部“三软”煤层大采高安全高效开采。本研究提出了适应深部复杂煤层特征的智能化开采方法, 为深部煤炭资源的安全高效开采提供了技术支撑。

     

    Abstract: Deep coal seams in complex geological environments are characterized by extremely high in-situ stress, severe surrounding rock deformation, and considerable variations in both strike and dip angles. These factors cause pronounced spatial heterogeneity in surrounding rock stress distribution and structural morphology, resulting in highly variable and dynamically evolving support system requirements. Existing support systems, constrained by fixed design parameters and limited functional adaptability, are incapable of meeting the requirements of intelligent mining in such coal seams. In this study, taking a kilometer-deep ultra-long working face in a demonstration mine of the Huainan mining area as the research object, a comprehensive analytical framework for the force coupling (magnitude, direction, and point of application) and spatial configuration-displacement coupling between the surrounding rock and the support system was established to reveal the spatiotemporal evolution mechanisms of overburden zonal fracturing and dynamic stress redistribution in ultra-long working faces. On this basis, a deep-learning neural network-based coupled prediction model was developed to achieve intelligent forecasting and real-time assessment of the stress states and positional behavior of both the surrounding rock and the support system. Furthermore, based on a non-parametric clustering algorithm, the working face was divided into distinct zones according to variations in support resistance and spatial position, and corresponding support and position control strategies were proposed for each zone. Subsequently, an integrated intelligent analysis and regulation system, termed "Three Measurements, Two Controls, and One Platform", was constructed for working faces in complex geological environments. This system enables comprehensive perception of surrounding rock mechanical behavior, support system stress responses, and spatial configurations, as well as integrated decision-making and control, significantly enhancing the ability of the support system to adapt to both gradual geological evolution and abrupt dynamic disturbances. Field application results verify its effectiveness in improving the adaptability and flexibility of the support system under complex conditions. In the ultra-long working face configuration, with a mining height of 5.0–6.2 m, an average dip angle of 14°, and a maximum strike angle of 17°, the cutting cycle frequency was increased to five passes per day, representing a 38.29% improvement compared with conventional mining methods. During a three-month demonstration period, the working face advanced 210.2 m and produced nearly 600 000 tons of coal. The system realizes safe and highly efficient mining of deep "three-soft" coal seams with a large mining height in the Huainan mining area. The intelligent mining approach adapted to the characteristics of deep and complex coal seams proposed in this study is expected to provide technical support for the safe and efficient exploitation of deep coal resources.

     

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