Abstract: Monitoring data and geological conditions were explored to study the large deformation mechanism, with an example of Zhonggong tunnel in RuijinGanzhou highway. The results show that the combination of rock structure and groundwater is the main effect for the large deformation, as well as the bias ground stress.  Based on the geological conditions in the field, arch replacement and small pipe grouting technology were used to control the deformation.  The measurement shows that the expectation is met with resolutions.

Key words: Tunnel Through Coal Seam, Large Deformation of Rock Mess, Mechanism Analysis, Regulation Measures