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运用自行研制的型煤制样设备,借助RMT–150B岩石力学试验系统对不同含水率及黏土含量下松软煤体的力学特征开展试验研究。结果表明:(1)在试验含水率(1.59%~6.50%)范围内,相同黏土含量下的松软煤体均存在一个临界含水率,在该含水率水平时,煤体的抗压强度最高、弹性模量最大;(2)黏土含量由4.00%增加到19.36%过程中,各含水率下的松软煤体抗压强度和弹性模量均呈先增后减的变化趋势,极高点黏土含量皆在11.68%左右;(3)其他条件相同时,随含水率的增大、黏土含量的增多,松软煤体脆性降低而延性增加,泊松比逐渐增大;(4)松软煤体颗粒间液桥力随含水率的变化是煤体宏观力学行为演化的主要原因,适量的黏土颗粒能够作为胶结物进一步强化煤体。研究成果对松软煤层的安全高效开采具有重要的理论意义和工程应用价值。
Using self-developed briquette sample preparation equipment, the mechanical characteristics of soft coal under different water content and clay content were studied by means of RMT-150B rock mechanics test system. The results show that: (1) In the range of 1.59% ~ 6.50% of water content, there is a critical moisture content in the soft coal with the same clay content. The compressive strength of the coal is the highest at the water content level, (2) In the process of increasing the clay content from 4.00% to 19.36%, the compressive strength and elastic modulus of soft coal under various water contents show the trend of increasing first and then decreasing, and the clay content at very high point (3) When the other conditions were the same, the content of clay increased with the increase of water cut, the brittleness of soft coal decreased and ductility increased, Poisson ratio increased gradually; (4) The change of hydraulic bridge force with water content is the main reason for the evolution of macro-mechanical behavior of coal. Appropriate amount of clay particles can be used as cement to further strengthen the coal. The research results have important theoretical significance and engineering application value for the safe and efficient mining of soft coal seam.