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基于球形空腔膨胀理论,将煤体在高压水射流冲击下的动态力学响应分为破碎区、裂纹区、弹性区,并分析了各区的力学特征,在此基础上得出了高压水射流冲击下煤体的破碎强度(即高压水射流发生破煤现象的最小冲击压力)的计算公式。将理论计算结果与实验和数值模拟进行对比分析,结果表明:煤体在相同力学参数条件下,数值模拟和模型实验得出的高压水射流破煤压力为15～20MPa,本文理论推导得出的煤体破碎强度(最小破煤压力)为17.86MPa,二者误差小于16%。
Based on the spherical cavity expansion theory, the dynamic mechanical response of coal under impact of high pressure water jet is divided into crushing zone, crack zone and elastic zone, and the mechanical characteristics of each zone are analyzed. Based on this, the impact of high pressure water jet impact Lower crushing strength of coal (ie, the maximum impact pressure of high-pressure water jet breaking coal phenomenon) formula. The theoretical calculation results are compared with the experiment and numerical simulation. The results show that under the same mechanical parameters, the coal pressure of high-pressure water jet obtained by numerical simulation and model experiment is 15 ~ 20MPa. The theoretical derivation The crushing strength of coal (minimum breaking coal pressure) is 17.86MPa, the error between the two is less than 16%.