Photoelastic experiment model and their experiments of bolt pre-tightening force effect

摘要

To study bolt pretension on the stability of roadway surrounding rock and their influence law by experimental method, we designed and developed photoelastic experiment model of bolt pre-tightening force simulation test, the experiment studied the effect regular that bolt pre-tightening force on the stability of surrounding rock.The experimental results showed that: applying a prestressing force for bolt can increase compressive stress area of the rock, improving the stress state of the surrounding rock effectively.The results obtained through the photoelastic experiment model to simulate the bolt support in surrounding rock stress field caused by prestressing force are in good agreement with results scholars adopted numerical simulation and draw the conclusion that the bolt interval plays an important role in supporting effect.