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 us...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.展开更多
We investigate the evolution of cylindrical cellular detonation with different instabilities.The numerical results show that with decreasing initial temperature,detonation becomes more unstable and the cells of the cy...We investigate the evolution of cylindrical cellular detonation with different instabilities.The numerical results show that with decreasing initial temperature,detonation becomes more unstable and the cells of the cylindrical detonation tend to be irregular.For stable detonation,a divergence of cylindrical detonation cells is formed eventually due to detonation instability resulting from a curved detonation front.For mildly unstable detonation,local overdriven detonation occurs.The detonation cell diverges and its size decreases.For highly unstable detonation,locally driven detonation is more obvious and the front is highly wrinkled.As a result,the diverging cylindrical detonation cell becomes highly irregular.展开更多
基金Project(2018YFC0604703)supported by the National Key R&D Program of ChinaProjects(51804181,51874190)supported by the National Natural Science Foundation of China+3 种基金Project(ZR2018QEE002)supported by the Shandong Province Natural Science Fund,ChinaProject(ZR2018ZA0603)supported by the Major Program of Shandong Province Natural Science Foundation,ChinaProject(2019GSF116003)supported by the Key R&D Project of Shandong Province,ChinaProject(SDKDYC190234)supported by the Shandong University of Science and Technology,Graduate Student Technology Innovation Project,China。
文摘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.
基金Supported by the National Natural Science Foundation of China under Grant No 10972040the National Basic Research Program of China under Grant Nos 2010CB832706,2011CB706904the Research Funds from the State Key Laboratory of Explosion Science and Technology(ZDKT11-01)of Beijing Institute of Technology.
文摘We investigate the evolution of cylindrical cellular detonation with different instabilities.The numerical results show that with decreasing initial temperature,detonation becomes more unstable and the cells of the cylindrical detonation tend to be irregular.For stable detonation,a divergence of cylindrical detonation cells is formed eventually due to detonation instability resulting from a curved detonation front.For mildly unstable detonation,local overdriven detonation occurs.The detonation cell diverges and its size decreases.For highly unstable detonation,locally driven detonation is more obvious and the front is highly wrinkled.As a result,the diverging cylindrical detonation cell becomes highly irregular.
