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The surrounding rock of roadways exhibits intricate characteristics of discontinuity and heterogeneity. To address these complexities, this study employs non-local Peridynamics (PD) theory and reconstructs the kernel function to represent accurately the spatial decline of long-range force. Additionally, modifications to the traditional bondbased PD model are made. By considering the micro-structure of coal-rock materials within a uniform discrete model, heterogeneity characterized by bond random pre-breaking is introduced. This approach facilitates the proposal of a novel model capable of handling the random distribution characteristics of material heterogeneity, rendering the PD model suitable for analyzing the deformation and failure of heterogeneous layered coal-rock mass structures. The established numerical model and simulation method, termed the sub-homogeneous PD model, not only incorporates the support effect but also captures accurately the random heterogeneous micro-structure of roadway surrounding rock. The simulation results obtained using this model show good agreement with field measurements from the Fucun coal mine, effectively validating the model's capability in accurately reproducing the deformation and failure mode of surrounding rock under bolt-supported (anchor cable). The proposed subhomogeneous PD model presents a valuable and effective simulation tool for studying the deformation and failure of roadway surrounding rock in coal mines, offering new insights and potential advancements. [ABSTRACT FROM AUTHOR]

The paper is to learn the experience in the field of Manned/Unmanned Aerial Vehicle (MUAV) cooperative technology and enlighten the technology development and progress of our country. First of all, it is to collect the typical research projects and tracke experiment dynamic, excavate the development in the field of MUAV cooperative technology route; And then, attention is paid to the related typical application cases to analyze the current technical maturity; Second, from the perspective of technology development, application, analysis is executed from the human-computer interaction control technology, intelligent decisionmaking technology, communication anti-jamming technology, open hardware and software technology to MUAV; Finally, the experience of the U.S. military in the field of MUAV collaborative technology are summarized, and the enlightenment for the development of China in the field is given. [ABSTRACT FROM AUTHOR]