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为获得含水率及孔隙率综合影响下松软煤体强度特征的变化规律,针对淮南矿业集团新庄孜煤矿66207工作面松软煤体,运用自行研制的型煤制样装置,借助RMT-150B岩石力学试验系统,开展了不同孔隙率下松软煤体强度特征的含水率效应试验研究。研究结果表明:各孔隙率下松软煤体的单轴抗压强度随含水率的增大均呈先增后减的基本规律,最高强度对应的临界含水率具有差异性;随孔隙率的增大,煤体临界含水率呈线性增大,而含水率影响下的煤体最高强度逐渐降低。结合液桥力理论,引入液体饱和度,揭示了松软煤体力学特征演化的内在机制。研究成果阐释了松软煤体临界含水率变化的本质原因,可为实施松软煤层的安全高效开采提供理论依据。
In order to obtain the change law of the strength characteristics of soft coal under the combined influence of moisture content and porosity, aiming at the soft coal of 66207 working face of Xinzhuangzi Coal Mine of Huainan Mining Group, using self-developed briquette sample preparation device, with the aid of RMT-150B rock mechanics test System, the experimental study on moisture content effect of soft coal under different porosity was carried out. The results show that the uniaxial compressive strength of soft coal under various porosity shows the basic principle of first increasing and then decreasing with the increase of water content, and the critical moisture content corresponding to the highest strength has the difference. With the increase of porosity , The critical moisture content of coal increases linearly, while the maximum strength of coal under the influence of water content decreases gradually. Combined with the liquid bridge force theory, the liquid saturation is introduced to reveal the intrinsic mechanism of the evolution of mechanics characteristics of soft coal. The research results explain the essential reason of the change of critical moisture content of soft coal, which can provide theoretical basis for the safe and efficient mining of soft and soft coal seam.