Research On Stress-relief By Relieving Roadway And Secondary Support In High-stress Soft Rock Roadway

With the increase of mining depth, deep high-stress soft rock roadways is affected by various factors. The deformation is more and more intense, and the damage is serious. The supporting problems are more and more prominent. In my paper, through theoretical analysis, numerical simulation and field test methods and practice of-885 roadway in Zhu Jidong coal mine, the main conclusions are as follows:(1)-885 roadway is a typical deep high stress soft rock roadways. And its characteristics is support serious damage, large deformation rheological, surrounding rock broken. The cause are the complex stress field of surrounding rock of roadway, the supporting structure unreasonable, the physical and mechanical characteristics of surrounding rock of roadway, and affected by mining;(2) The theoretical analysis and numerical simulation shows that the deformation of deep high stress soft roadway applys to support resistance of roadway surrounding rock lithology, stress state and related support mode. Under the action of high stress, from the soft rock tunnel excavation after 10 d to 70 d, displacement of roof and floor present a tendency of linear increase gradually, over time to deep roadway surrounding rock broken area grew with extension;(3) Through simulation analysis of the three types of pressure relief program, co MPared with no pressure relief roadways, side Angle under unloading the most reasonable.Plan three is more noticeable to reduce the effect of the bottom plate. At the same time, relative to the unloading conditions, roof displacement decreased by 23%, and bottom displacement by 40%. For the stress concentration of the buffer, it also has certain effect;(4)-885 rail roadway by anchor beam supporting, is from the passive support to active support. this way increases the support resistance, and changes the status of u-shaped tent completely passive support. Through hole grouting depth, it can increase the self-bearing capability of roadway surrounding rock circle, change of the nature of the surrounding rock of soft rock roadways, improve the cohesion and friction angle of surrounding rock, improve its carrying capacity, and maintain the long-term stability of the roadway.The secondary support plan in technology and economy has certain feasibility.The paper has together 41 figures,7 tables and 99 references.