Abstract: The real time monitoring program on the rock mass was implemented in the Houci Tunnel excavation of Zhanglong Expressway in Fujian Province. The objective of the instrumentation program was to monitor the deformations at crest and walls at both sides of the excavated tunnel. The threedimensional finite element analysis model was established to simulate the rock mass deformations before and after tunnel excavation. Further, both the length and the spacing of the ground anchor were optimized from the numerical analysis and the results can be applied for the support of the tunnel excavations.

Key words: Tunnel Expansions, Real Time Monitoring, ThreeDimensional Finite Element Method, Optimization Analysis