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Abstract：
The automatic cutting of coal and rock surface morphology modeling based on the actual geological environment of coal mine underground excavation and mining is of great significance for improving the surface quality of coal and rock after cutting and enhancing the safety and stability of advanced support. To this end, using the principle of coordinate transformation, the kinematic trajectory of the cutting head of the tunneling machine is established, and the contour morphology of the cutting head under variable cutting technology is obtained. Then, based on the regenerative vibration theory of the cutting head, a dynamic model of the cutting head coal wall is established, and the coordinate relationship of the cutting head in the tunnel coordinate system under vibration induction is analyzed. Based on fractal theory and Z-MAP method, a simulation method for the surface morphology of coal and rock after cutting is proposed, which is driven by the cutting trajectory Under the coupling effect of cutting vibration induction and random fragmentation of coal and rock, simulation of the surface morphology of comprehensive excavation tunnels was conducted, and relevant experiments were conducted to verify the results. A 1:3 similarity experimental model of EBZ160 tunneling machine was used to build a cutting head coal and rock system cutting experimental platform for comparative experiments of cutting morphology. Furthermore, statistical methods were used to compare and evaluate the simulated roof with the actual roof. The results show that the relative errors between the maximum range of peaks and valleys, the peak skewness coefficient of height standard deviation, and the kurtosis coefficient of the actual roof are 1.3%, 24.5%, 16%, and 2.9%, respectively. Overall, this indicates that the surface morphology distribution characteristics of the simulated roof and the actual roof are similar, verifying the effectiveness of the modeling and simulation method proposed in this paper, and providing theoretical support for the design and optimization of advanced support in the future.
摘要：
基于煤矿井下开挖开采实际地质环境的煤岩表面形貌自动切割建模,对于提高切割后煤岩表面质量,增强超前支护的安全性和稳定性具有重要意义。为此,利用坐标变换原理，建立了掘进机截割头的运动轨迹，得到了可变切削技术下切削头的轮廓形貌。然后，基于切割头的再生振动理论，建立了割头煤壁的动力学模型，分析了截割头在振动诱导下隧道坐标系中的坐标关系。基于分形理论和Z-MAP方法,提出了一种煤岩切割后表面形貌的模拟方法，在切削振动诱导和煤岩随机破碎的耦合作用下，由切削轨迹驱动，对综合开挖隧道的地表形态进行了模拟,并进行了相关实验验证。采用EBZ160掘进机1:3相似实验模型,搭建了截头煤岩系统截割实验平台,进行截割形貌对比实验。此外，采用统计方法对模拟屋面与实际屋面进行比较和评价。结果表明,峰和谷的最大范围之间的相对误差,高度标准偏差的峰值偏度系数，实际屋顶的峰度系数为1.3%，24.5%,16%,和2.9%，分别。总的来说,这表明模拟顶板和实际顶板的表面形态分布特征相似，验证了本文提出的建模与仿真方法的有效性,为今后先进支护的设计和优化提供理论支持。
