Abstract：
This paper discusses the analysis and research undertaken regarding construction, operation, and monitoring of the Qyueshan tunnel in a large fault. The tunnel structure has been optimized several times due to complex geological conditions and high water pressure. To understand the structural stability during construction and operation, three sections within the fault zone were selected and long-term monitoring (41 months) was carried out regarding the water pressure, contact pressure of the surrounding rock and primary support, internal force of the primary support, contact pressure of the primary support and secondary lining, and the internal force of the secondary lining. The monitoring results show that the measured values are far below the designed ones and the variation is small.
2013, Vol. 50 