Numerical simulation research on response characteristics of surrounding rock for deep super-large section chamber under
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Numerical simulation research on response characteristics of surrounding rock for deep super-large section chamber under dynamic and static combined loading condition FAN De-yuan(范德源)1, LIU Xue-sheng(刘学生)1, 2, 3, TAN Yun-liang(谭云亮)1, 2, SONG Shi-lin(宋世琳)1, NING Jian-guo(宁建国)1,2, MA Qing(马庆)1 1. School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China; 2. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China; 3. State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, China Energy Group Co., Ltd., Beijing 100011, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: The stability control of surrounding rock for large or super-large section chamber is a difficult technical problem in deep mining condition. Based on the in-site geological conditions of Longgu coal mine, this paper used the dynamic module of FLAC3D to study the response characteristics of deep super-large section chamber under dynamic and static combined loading condition. Results showed that under the static loading condition, the maximum vertical stress, deformation and failure range are large, where the stress concentration coefficient is 1.64. The maximum roof-to-floor and two-sides deformations are 54.6 mm and 53.1 mm, respectively. Then, under the dynamic and static combined loading condition: (1) The influence of dynamic load frequency on the two-sides is more obvious; (2) The dynamic load amplitude has the greatest influence on the stress concentration degree, and the plastic failure tends to develop to the deeper; (3) With the dynamic load source distance increase, the response of surrounding rock is gradually attenuated. On this basis, empirical equations for each dynamic load conditions were obtained by using regression analysis method, and all correlation coefficients are greater than 0.99. This research provided reference for the supporting design of deep super-large section chamber under same or similar conditions. Key words: deep mining; super-larger section chamber; static load; dynamic load frequency; dynamic load amplitude; dynamic load source distance Cite this article as: FAN De-yuan, LIU Xue-sheng, TAN Yun-liang, SONG Shi-lin, NING Jian-guo, MA Qing. Numerical simulation research on response characteristics of surrounding rock for deep super-large section chamber under dynamic and static combined loading condition [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4509-5
1 Introduction In China, the coal resources are in high-
intensity mining for a long time, the shallow coal resources are gradually exhausted, and the coal mining is gradually transferred to the deep [1−5]. In recent years, more and more large and super-large
Foundation item: Project(2018YFC0604703) supported by the National Key R&D Program of China; Projects(51804181, 51874190) supported by the National Natural
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