| This paper carried on the system analysis for supporting the difficult problem of deformation of soft rock roadway, the deformation of surrounding rock is considered as a time-varying dynamic process, to overcome the shortage of common rock strength theory ignores the strain time effect, has the characteristics for the soft rock, focuses on the analysis of soft rock and soft rock creep mechanism, the surrounding rock is divided into three stages, the creep mechanism of rock, the more in line with the actual situation of rock D-P criterion, considering the similarity of long test period, high cost shortcomings, with the numerical simulation and on-site industrial test combination. Using ABAQUS numerical simulation software, the rock plastic criterion and creep of rock as a unified body, using the coupling method, the Huaibei Xutuan mine in a tunnel in the same geological conditions with no support, shed support, anchor net spray and other various supporting methods for numerical simulation, analysis of the deformation of different branch roadway surrounding rock roadway. Through data comparison, found that shed support is unable to control the creep deformation of soft rock, which can not control the surrounding rock bolt; the different length of the control effect of the deformation of surrounding rock loose circle far, accord with the theory of rock from the angle of mechanics; for bolting and shotcreting way of surrounding rock deformation control effect is very good. The analysis results based on numerical simulation, the Xutuan mine roadway selected13test section, take the bolting and shotcreting, the on-site verification, the results show that deformation measurement for several months, the result of numerical simulation is accurate. Although considered separately is a particular situation, but for others in high stress soft rock roadway should control has certain practical reference value. |
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