Abstract：
Joints and faults may cause discontinuity of rock mass deformation, and they significantly affect the mechanical behavior of rock mass deformation, stress, and so on. In this paper, two improvements are made to the existing discontinuous deformation analysis program, i.e., the adoption of an improved SSOR-PCG method and the addition of displacement convergence criterion. A stability analysis of a highway tunnel is carried out by the improved program, and the excavation procedures are optimized by monitoring displacement of the key points. The results show that one-time excavation of a left/right tunnel causes less disturbance to surrounding rocks than excavation by steps. Based on the monitoring of key displacement points, the anchoring effect is analyzed and support parameters are optimized.
2014, Vol. 51 