As a product of polymeric materials, geomembranes (GMs) are widely used in engineered systems as impervious barriers due to their low permeability. In this study, a large-scale composite shear test apparatus was developed to investigate the shear behaviors of various GM interfaces. A series of direct shear tests were conducted on GM–soil, GM–geotextile, and GM–concrete interfaces. Two types of high-density polyethylene (HDPE) GMs, a smooth GM and a textured GM, were used to evaluate the effect of GM-texturing on the shear properties of these interfaces. Based on the experimental data, the friction angles and adhesions of GM interfaces were calculated using the Mohr–Coulomb criterion. Test results describing the behavior of GM–soil and GM–geotextile interfaces from the current study were then compared with results from previous studies. The test results are shown to verify the reliability of the new large-scale composite shear apparatus. In addition, this paper presents preliminary experimental results of the GM–concrete interface shear tests.
The five axis CNC laser machining machine is widely used in the processing industry with high efficiency and precision and other advantages. Based on the basic principle of kinematics theory on the multi-body system, this paper describes the homogeneous coordinate transformation law of the five-axis laser machining machine tool based on GSN control card, and analyzes the solution of the motion trajectory and converts it into the incremental data of the position of each axis in the coordinate system of the machine tool, which solves the correctness, universality and automation of the numerical control system. It provides a powerful help for the five axis CNC laser machining machine based on GSN control card.
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