Given the challenges in managing large deformation disasters in energy engineering, traffic tunnel engineering, and slope engineering, the excavation compensation theory has been proposed for large deformation disasters and the supplementary technology system is developed accordingly. This theory is based on the concept that "all destructive behaviors in tunnel engineering originate from excavation." This paper summarizes the development of the excavation compensation theory in five aspects: the "theory," "equipment," "technology," the design method with large deformation mechanics, and engineering applications. First, the calculation method for compensation force has been developed based on this theory, and a comprehensive large deformation disaster control theory system is formed. Second, a negative Poisson's ratio anchor cable with high preload, large deformation, and super energy absorption characteristics has been independently developed and applied to large deformation disaster control. An intelligent tunnel monitoring and early warning cloud platform system are established for remote monitoring and early warning system of Newton force in landslide geological hazards. Third, the double gradient advance grouting technology, the two-dimensional blasting technology, and the integrated Newton force monitoring--early warning--control technology are developed for different engineering environments. Finally, some applications of this theory in China's energy, traffic tunnels, landslide, and other field projects have been analyzed, which successfully demonstrates the capability of this theory in large deformation disaster control.
Deep sea mining, as a frontier area in China, urgently needs to make progress in automatic navigation technology. In order to improve the operation efficiency of the seabed mining machine on the soft seabed, the submarine mining vehicle which complete the mining work in a certain mining area need to enter the next mining area quickly and economically. As a classical algorithm, the majority of scholars consider that A * algorithm is the most practical path planning search algorithm. Considering the limitation of operation conditions, the three-dimensional diagram is transformed into two-dimensional diagram by interpolation method when the seabed terrain conditions allow, and then the obstacles can be marked in two-dimensional diagram. A* algorithm was applied into the path planning of mining truck. The simulation results of the paper show that path cost, turning time and turning mode should be considered in the process of avoiding obstacles.
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