principal velocity
1.Some key technical problems about construction method, vehicle velocity and clearance of the tunnel scheme were discussed according to the geographical location, engineering geological conditions, request of the harbor entrance and shipping, localization of the tunnel and some principal technical criterions.
2.Taking the results as boundary constraint and the velocity field of horizontal movement after transforming reference frame as the load of FEM node, the velocity field of horizontal movement in the region is simulated, the principal strain rate field and maximal shear strain rate field are calculated, the variety characteristics of the two rate fields and relation between the variety characteristics and strong earthquake preparation are analyzed.
