Li Y.,Central South University |
Yuan L.,Pingan Coal Gas Control National Engineering Research Center Co. |
Liu G.-X.,Pingan Coal Gas Control National Engineering Research Center Co. |
Jin X.-Y.,Pingan Coal Gas Control National Engineering Research Center Co. |
And 4 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2014
It is shown that elastoplastic stress field of circular roadway, which is given by the classic plasticity mechanics, is not correct. Therefore, it affects rationality of stability evaluation and support design of circular roadway. Based on the accurate analytic solution obtained by the new solving system of plastic mechanics, failure zone, relationship between stratum residual strength and support pressure of circular roadway are studied in isotropic and homogeneous stratum. The following results are obtained: (1) Failure zone increases as mining depth increase, which is basically a linear relation. (2) Relationship among support pressure, depth of roadway, strength and residual strength of surrounding rock, Poisson's ratio and bulk density is established. These results will be of great help to support design.