【摘要】 综合采用理论分析、工业性试验等方法，构建了应力、水压非均匀分布下底板隔水层组协同变形力学模型，分析了单一因素、多因素交互效应下采动底板等效渗透率响应特征，提出了底板承压含水层原位保护可行性定量评估方法。结果表明：采动底板隔水层挠度随水压、推进距离、工作面长度的增大而增大，和倾角呈近似线性负相关；采动底板等效渗透率以35°为临界点，随着倾角的增大呈现出先增大后减小趋势，由挠度主导向中性层应变主导转变；软硬互层底板可有效抑制底板变形与底板等效渗透率；构建了汾源煤矿采动底板等效渗透率多参量响应模型，确定了底板等效渗透率影响因素敏感性排序：水压>面长>推进距离>水压-水压>水压-面长；水压、面长较大时，煤层倾角、推进距离对底板等效渗透率的影响显著增强；以水质、水量为评价指标，汾源煤矿5-103大倾角高承压工作面实现了底板水原位保护。更多还原

【Abstract】 A collaborative deformation mechanical model of the floor aquitard group under non-uniform distribution of stress and water pressure was constructed through a combination of theoretical analysis, industrial testing, and other methods. On this basis, the equivalent permeability response characteristics of the mining floor were analyzed under both single-factor and multi-factor interactive effects, and a quantitative evaluation method for the feasibility of in-situ protection of floor confined aquifers was proposed. The main conclusions are as follows: The deflection of the aquitard on the mining floor grows with the increase of water pressure, advancing distance, and working face length, and is approximately linearly negatively correlated with the inclination angle. The equivalent permeability of the mining floor rises first and falls subsequently with the increase of inclination angle, 35° being the critical point, which reflects a transition in the dominant mechanism from floor deflection to neutral layer strain. The soft-hard interlayer floor can effectively suppress the deformation of the floor and lower its equivalent permeability. Furthermore, a multi-parameter response model for the equivalent permeability of the mining floor in Fenyuan Coal Mine was constructed, and the sensitivity ranking of the equivalent permeability of the mining floor under different factors was determined as follows: water pressure>face length>advancing distance>water pressure-water pressure>water pressure-face length. When the water pressure and face length are large, coal seam dip angle and advancing distance exert a more marked influence on the equivalent permeability of the floor. By taking water quality and quantity as evaluation indicators, in-situ protection of floor confined water was successfully achieved in the steeply inclined high-pressure 5-103 working face of Fenyuan Coal Mine.更多还原