Browsing by Author "DONG, JJ"

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TIME-DEPENDENT TUNNEL CONVERGENCE .1. FORMULATION OF THE MODEL
(1991-11-01)
PAN, YW
;
DONG, JJ
;
交大名義發表
;
土木工程學系
;
National Chiao Tung University
The understanding of the mechanism of tunnel convergence is essential for designing the required support of a tunnel. To take various time effects on the convergence-confinement relation into account, it is possible to correlate different factors with time, then to deal with their collective effects. As a result, the time-dependent tunnel deformation problem can be modelled as a viscoelastic problem. The solutions of various visocoelastic models can be obtained from the corresponding elastic solution based on a standard procedure. In this paper, a hierarchical approach, which considers: (1) the rheological properties of a rock mass; (2) the advancement of the tunnel; and (3) the tunnel-support interaction is proposed to model the excavation/construction process during the tunnelling in a rock mass with rheological properties. The time-dependent factors considered in the proposed model are discussed. Subsequently, the theoretical formulation of this model is developed.
TIME-DEPENDENT TUNNEL CONVERGENCE .2. ADVANCE RATE AND TUNNEL SUPPORT INTERACTION
(1991-11-01)
PAN, YW
;
DONG, JJ
;
交大名義發表
;
土木工程學系
;
National Chiao Tung University
A time-dependent model of tunnel convergence for tunnelling in a viscoelastic rock mass is proposed in the accompanying paper (this issue, pp. 469-475) to model the excavation-construction process during tunnelling in a rock mass with rheological properties. In this paper, a parametric study based on this model is presented to investigate the effects of the tunnelling advancing and support installation, respectively, on the tunnel convergence and on the support-pressure. Furthermore, a non-linear optimization procedure is suggested to calibrate the required model parameters from the in situ measured tunnel-convergence data. Discussion on the proper application of the proposed model and the optimization calibration are also included.