Experimental Study on Crushing Characteristics of Lignite under Different Load Conditions

Coal particle size and the degree of compaction significantly affect goaf heritage ventilated environment process spontaneous combustion coal, distribution are also affected by load application process, stress in is not uniform, resulting mined-out coal. It necessary to carry out experimental studies on coal crushing granularity under different loads loading processes clarify its law. Therefore, experiments were conducted, analyze compression behaviors distributions with speeds loads. The results show that, slow pressure application, lump was constantly compressed, compacted, broken. With increase axial load, compressibility increased, coefficient fragmentation porosity decreased. When greater than compressive strength, variation trend slowed. two times as continued increase, basically did occur. thickness will be reduced 0.5 that loose when a significant change ratio occurs. After body pressure, intensified. fractal dimension sizes broken particles followed logarithmic relationship stress. stress, crushing, 2.5 mm an important boundary. more strength value, increased significantly. residual if there no impact, influence initial periodic variations significant, accumulation only peak