Combining practical engineering example,the method of unloading the anchor ropes pre-stress through overstretch is reviewed,and the influence of anchor ropes working effected by the loading-unloading-reloading function process is analyzed.

According to the theory that the inner product of tensors and the product of coordinate will be transformed in the same way under the symmetry operation of a given point group,the dynamic tensors of different irreducible representations are calculated through the programming of C language,and the hyper-Raman tensors for groups with fivefold rotation axes are tabulated.