Abstract: 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 indicate 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.

Key words: weak-broken rock, high strength and high pretension stress, support resistance, mine-induced stress, steel arched yielding support