In order to study the influence of moisture intrusion on crack propagation and failure mode of loaded coal, uniaxial compression tests and acoustic emission monitoring of coal with different moisture contents are carried out. The stress-strain characteristics, macroscopic failure patterns and change law of cumulative ringing counts of loaded coal with different moisture contents are compared and analyzed. The results of uniaxial compression tests show that with the increase of moisture content, the uniaxial compressive strength and elastic modulus of coal decrease continuously. The stress drop rate of coal gradually slows down in the post-peak stage. The macroscopic failure mode of coal samples changes from typical brittle failure to shear-tension combined failure. The acoustic emission monitoring results show that the cumulative ringing counts decreases with the increase of coal moisture content. The cumulative ringing counts curve's slope increases correspondingly, indicating that moisture intrusion can reduce the energy release when the coal cracks develop. However, the moisture intrusion aggravates the internal structure damage of coal. The results show that the water intrusion weakens the friction between crystal particles on the surface of cracks to some extent, and increases the possibility of coal sliding failure. At the same time, the water intrusion also reduces the surface active energy of the coal, resulting in a significant increase in the number of cracks generated during the loading process of the coal sample. This leads to a large drop in the macroscopic mechanical strength of the coal.

针对现有液压支架支护系统在工作中普遍存在的支护高度控制准确度差、自动化程度低下的问题,提出了一种采用倾角传感器的液压支架支护高度测量及调节控制系统,同时针对煤矿井下环境恶劣、信号干扰大的问题,提出了小波分解重构的信号传输方案,以提升液压系统工作时对支护高度监测和控制调节的准确性.通过在煤矿井下的实际应用表明,该控制系统能够确保液压支架顶梁的支护高度调节控制误差在30 mm以内,确保了液压支架支护的可靠性.

针对架空乘人装置在长期运转过程中存在着能耗高、运行成本经济性弱的缺陷,提出一种基于智能控制装置的架空乘人装置综合节能控制装置,通过对架空乘人装置上人员分布和数量的监测实现自动调整架空乘人装置的运行速度,调整驱动电机的输出功率,以满足架空乘人装置的节能需求.该节能控制装置极大降低了架空乘人装置在运行时的电能消耗,显著提升了架空乘人装置的运行经济性.