DOI: 10.7672 / sgjs2026020099
This paper establishes a CSS constitutive model that considers the effects of confining pressureand plastic strain, analyzes the support mechanism of prestressed anchor bolts and surrounding rocks,and explores the effects of anchoring timing, distribution density, and prestress on the support effect. Theresearch results indicate that the strength and stiffness of the surrounding rock continue to deteriorate afterexcavation of the tunnel, and it is necessary to implement the anchoring system as soon as possible on thepremise that the anchor bolts and cables are not damaged. The timing of anchoring, distribution density,and prestress are key factors affecting the support effect, and the optimal anchoring parameters can bedetermined by the degree of deterioration of surrounding rock parameters and the failure of anchor boltsand cables.