(1. School of Mining Engineering，Guizhou Institute of Technology，Guiyang，Guizhou 550003，China；2. School of Energy and Mining Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；3. School of Mining，Guizhou University，Guiyang，Guizhou 550025，China；4. School of Mining Engineering，Anhui University of Science and Technology，Huainan，Anhui 232001，China；5. Guizhou Qianchenglijin Technology Co.，Ltd.，Guiyang，Guizhou 550081，China；6. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；7. Shendong Coal Group Corporation Limited，China Energy Investment Group Co.，Ltd.，Ordos，Inner Mongolia 017010，China)
Abstract：In order to solve the complex regional stress caused by excavation of roadway and working face and the maintenance problem of soft rock roadway surrounding rock broken by strong dynamic pressure. Taking the 1570 track stone gate of Daliuchang Coal Mine in Guizhou as the engineering background，numerical simulation，theoretical analysis and field industrial test are used to carry out the research. Based on field investigation and data monitoring，the characteristics of large deformation of surrounding rock and failure of supporting components of 1570 track Shimen are analyzed. The reasons for the poor self-stability of surrounding rock are revealed by water soaking test (combined with XRD analysis) and loosening ring test. The stress distribution law during excavation of 1570 track stone gate is revealed by numerical simulation，and its deformation and failure mechanism is obtained. The ultimate bearing stress of the most dangerous section of the concrete steel arch is obtained by theoretical analysis，and it is determined that the restricted steel pipe filling structure used can limit the large structure movement caused by mining. Numerical simulation is used to analyze the stress distribution and deformation control effect of surrounding rock after reconstituted multi-bearing structure support and without support，and the control principle of full-space collaborative support technology for reconstituted multi-bearing structure is expounded. Through the construction of three-storey strong bearing structure，the shallow and deep surrounding rocks form an integrated high-strength anchor solid bearing structure，and the whole bearing capacity of surrounding rocks and the whole anti-deformation ability of surrounding rocks are mobilized to realize the full-space three-dimensional support system and ensure the stability of the roadway. Based on the above research，the industrial test was carried out underground. The results show that the multi-bearing structure full-space collaborative support technology has a remarkable effect on the deformation control of soft surrounding rock roadway. Compared with the original support，the convergence of the roof and floor and the two sides of the roadway is reduced by 91.67% and 88.33% respectively，and the roadway maintenance cost is saved at the same time，which provides an effective way to control the surrounding rock of the soft rock roadway broken by strong dynamic pressure.
