Application of Support Technology with High Strength and High Pretension Stress for Weak-Broken Rocks

Due to high stress and low rock strength environment,the support of weak-broken rocks under the condition of deep mining should be solved through strengthening broken rock,reinforcing support resistance and decreasing the mine-induced stress.For the purpose of permanent support for the weak-broken rocks,this study has pointed out the support technology with high strength and high pre-tension stress which is based on the bolt-wire-shotcrete system combined with steel arched yielding support.This kind of support technology have combined the each support element and adequately taken advantage of load-caring capacity of surrounding rocks.Based on the monitoring data of Xiaokang coal mine and Muchengjian coal mine,the characters of weak-broken rocks and the features of the support technology with high strength and high pretension stress were analyzed.The results of field tests indi-cate that the support technology with high strength and high pretension stress has provided powerful support force to resist large deformation of weak-broken surrounding rocks for the various geological conditions.It is proved that the mine-induced stress can also be released by the support technology and the support technology with high strength and high pretension stress has economical significance.