STUDY ON DEFORMATION LAW AND FAILURE MECHANISM OF ANCHORAGE-SURROUNDING ROCK SYSTEM UNDER TENSILE-SHEAR COMPLEX STRESSES—TAKING SUPER-LARGE SUSPENSION BRIDGE ON BALING RIVER FOR EXAMPLE
Abstract：Anchor basement is the key bearing component of suspension bridge；and its deformation and failure mechanism is the foundation of strength and stability evaluation. Several facts are found through the in-situ pull model test. The total displacement and the rate of residual displacement on the back anchor face show saddle and V-shaped distribution，respectively. The displacement of the surrounding rock on the flank appears plug-style distribution，and the rate of the permanent deformation is high. According to the numerical model test to be by fast Lagrangian analysis of continuum in 3D(FLAC3D)，some conclusions are also drawn：(1) the stress field shows subsection character，and the stress transfer route between fore part and back part of the anchor body is different；(2) the plastic zones which appear plug-style are mainly found beside the anchor and in the upper rock mass；(3) tensile-shear complex failure maybe happen in the rock-anchor system. The plastic zones and the prominent deformation zones in the rock mass should be paid more attention during design and construction.
