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Calculation Method for the Radial Displacement of a Circular Tunnel Considering the Time Effect of the Viscosity Coefficient
(1 School of Resource and Civil Engineering of Wuhan Institute of Technology, Wuhan 43000; 2 School of Civil Engineering &Mechanics of Huazhong University of Science and Technology, Wuhan 43000; 3 School of Geosciences and Info-Physics of Central South University, Changsha 410075; 4 Wuhan CTI-CRSRI Engineering & Environment Co. Ltd., Wuhan 43000; 5 School of Engineering and Technology of China University of Geosciences, Wuhan 43000)
Abstract Based on a K-B Model, an analytic expression for the radial viscoelastic displacement of surrounding rock under an asymmetric load is established by way of the correspondence principle. Based on the records of the time-dependent creep parameters for the K-B model in relevant literatures, a viscoelastic solution for the radial displacement of the rock mass considering the time effect of the creep parameters of the K-B Model is obtained. A comparison of data shows that the maximum radial displacement considering the time effect of the creep parameters is larger than that which doesn′t consider it, and this indicates that it takes longer for the rock mass to reach a steady state in the former case compared with the latter one. According to a comparison between practical monitoring results and theoretical calculation results, it is determined that the laws of variation with time for both cases are consistent and the actual displacement is larger than the theoretical one, with an error scope of 18% to 26% .
Abstract：
Based on a K-B Model, an analytic expression for the radial viscoelastic displacement of surrounding rock under an asymmetric load is established by way of the correspondence principle. Based on the records of the time-dependent creep parameters for the K-B model in relevant literatures, a viscoelastic solution for the radial displacement of the rock mass considering the time effect of the creep parameters of the K-B Model is obtained. A comparison of data shows that the maximum radial displacement considering the time effect of the creep parameters is larger than that which doesn′t consider it, and this indicates that it takes longer for the rock mass to reach a steady state in the former case compared with the latter one. According to a comparison between practical monitoring results and theoretical calculation results, it is determined that the laws of variation with time for both cases are consistent and the actual displacement is larger than the theoretical one, with an error scope of 18% to 26% .
.Calculation Method for the Radial Displacement of a Circular Tunnel Considering the Time Effect of the Viscosity Coefficient[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(6): 77-84
2017, Vol. 54 