| The model is generated in the paper taking the fully mechanized caving face in Yang-village mine, Yima group as engineering background, Based on the UDEC numerical simulation software: Firstly, the distribution law of abutment pressure during the advancing process of the fully mechanized caving face is simulated in discrete element, and the change law of distribution law of abutment pressure with the push mining length is obtained; the validity for the conclusion of small pillar gob-side entry is validated , and the conditions forming internal-external stress fields are discussed. Further, using UDEC software the influence of joint characteristics parameters on surrounding rock stability of fully-mechanized caving roadway is analyzed, and from the aspects of the horizontal compressive stress between joint surfaces of roof, the roof sinking magnitude and surrounding rock failure and so on, the fully-mechanized caving roadway is simulated with different anchorage form and bolt length, with pallet and steel belt or not, different block size and different buried depths. and the conclusions are obtained as follows: the horizontal compressive stress between joints surfaces of rock block is significantly increased with the bolt support effect of joints rock, so the friction of joint surface is increased and the surrounding rock stability is maintained and the anchorage support effect is significantly improved in pre-stressed bolting support using pallet and steel belt.. The results provides a theoretical basis and guide to the scene to the roadway and tunnel dug anchoring of Yima Yangcun Coal Mine. |
PDF Full Text Request