ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 27    No. 5    May 2017

Deconstruction method and numerical simulation method of determination of tunnel roof’s dangerous area in caving stoping process
CHEN Qing-fa1, NIU Wen-jing1, ZHENG Wen-shi1, LIU Jun-guang1, LIU Yan-zhong2, YIN Ting-chang1
(1. College of Resources and Metallurgy, Guangxi University, Nanning 530004, China;
2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China
)
Abstract: The test area was selected in caving mining area of No. 92 ore body’s fracture ore rock at Tongkeng Minewas. The concrete connotation of the deconstruction method and numerical simulation method of determination of tunnel roof’s dangerous area in caving stoping process were described. The comparative analysis of calculation results and differences between these two methods was carried out. The results show that, firstly, the deconstruction method can accurately deconstruct the possible bulking forms and concrete occurrence positions of dangerous structural bodies. However, the number of dangerous structural bodies and the distribution range of dangerous area established by this method from aspects of vector are slightly smaller than real situation, and the results of roadway stability are slightly higher. Secondly, the numerical simulation method considers the influence of unloading and blasting action, so that it can more accurately analyze the roof subsidence and unstable states of structural bodies in stoping process. Nonetheless, it applies the virtual fracture surface to control the development range of structural planes, resulting in that the number of established dangerous structural bodies is excessive and the roadway stability is slightly lower than engineering practice. Thirdly, the deconstruction method should occupy dominant position, aided by the numerical simulation method, to comprehensively determine the dangerous area of roadway roof in engineering applications.
Key words: roadway roof; dangerous area; deconstruction method; numerical simulation method; caving mining method
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)