An efficient numerical simulation algorithm of cutterhead driving process
Starting from the grid division of the geotechnical elements and the searching process of the con-tact pair,an efficient numerical simulation algorithm of the shield cutterhead driving process is proposed.Specifically,a six-node triangular prism element is introduced,whose side length ratio is close to 1,and the interior angles on each face are approximately equal.Compared with the traditional hexahedral element,the calculation efficiency is higher;therefore,an efficient geotechnical finite element model was developed,and the reliability and efficiency of the model were verified by numerical simulation experiments of cylindrical uniaxial compression.According to the characteristics of the excavation of the shield cutterhead,the geotechnical grid nodes that may be in contact can be directly obtained.Compared with the traditional global searching method,it is more time saving and optimizes the searching process of the contact pair.Therefore,a novel and efficient method is proposed.Additionally,the reliability and efficiency of the algo-rithm are verified through the software and the above two strategies;composite shield cutterhead which is used in the actual project is realized by a single core CPU;the rock face topography,the load time history curve as well as the load distribution law about normal force of the cutterhead cutter after the excavation are obtained through the simulation.The reliability of the software is verified by comparison with the mean normal force of the cutterhead cutter which is obtained by ABAQUS and literature.
full-face tunnel boring machinecutterheadexcavation processcontactfinite element model
万方数据
维普
