Research on "theory of force-center" based on failure characteristics of different roadway sections and its application.

In high-stress deep mines prone to rock bursts, the significant deformation of roadway surrounding rock remains a critical scientific issue that urgently requires resolution. In this study, through theoretical analysis and numerical simulations, the failure mechanisms of different roadway sections are investigated, and the "force-center theory" is proposed. This hypothesis is validated by industrial experiments, yielding several key findings: (1) For any cross-sectional shape of the roadway, a unique peripheral circle will be formed, and the damaged area of the roadway section is mainly oriented towards the center of the peripheral circle.

Study on roof movement law of local filling mining under peak cluster landform.

The strip structure filling mining technology is suggested in response to the environmental issues such as surface subsidence and landslides brought on by the mining of 11,071 working faces in a mine in Guizhou. The mining technology system is studied through indoor testing, numerical simulation, and engineering monitoring. According to theoretical study, the filling strip can be steadily loaded and its value doesn't exceed 10 m when the width of the filling strip and the width of the filling interval are set to be equal.

Study on overlying strata migration law of strip interval filling mining.

Aiming at the problem that it is difficult to popularize in Guizhou mining area due to high filling cost, taking 11071 working face of Panzhihua Coal Mine in Liupanshui as the research background, the idea and technology of strip interval filling mining are put forward. Through theoretical analysis and mechanical tests, the reasonable range of strip spacing distance and mechanical parameters of filling body were obtained. The FLAC3D simulation software is used to analyze the stress field, displacement field, and plastic zone of five kinds of design schemes, and the UDEC simulation software is used to carry out the filling mining of No.

TiO2 nanotube array sensor for detecting the SF6 decomposition product SO2.

The detection of partial discharge through analysis of SF(6) gas components in gas-insulated switchgear, is significant for the diagnosis and assessment of the operating state of power equipment. The present study proposes the use of a TiO(2) nanotube array sensor for detecting the SF(6) decomposition product SO(2), and the application of the anodic oxidation method for the directional growth of highly ordered TiO(2) nanotube arrays. The sensor response of 10-50 ppm SO(2) gas is tested, and the sensitive response mechanism is discussed.