Based on field testing and numerical simulation results on prestressed anchor cable of suspension bridge with tunnel style anchorage system

the ultimate anti-pulling capacity of prestressed anchor cable affected by anchor length

free length，grouting pressure and the level of combination between grout-cable and rock mass were analyzed. The load and displacement distribution characteristic of anchor cable and host rock medium were compared single anchor with anchor cable group. Due to enhanced toughness and anti-crack of root effect

which were affected by embedded depth(free length)

spacing

initial prestress

load history

etc.

anchor cables restrained the rock mass deforming toward surface. Anchor length determines the ultimate anti-pulling capacity

but free length has key effect to transfer and disperse stress to wall rock and determines contribution value and occasion while they participated the load applied on tunnel anchorage system. Domino effect occured while the anchor cable group was destroyed.