Research methods: According to the different contents of phyllite,the trial section was determined and measurement sections were laid out by dynamic design method in combination with the design and construction of phyllite stratum in ridge section at Wushaoling Tunnel on the second line of hanzhou-Wuwei Railway. The analysis and summary of deformational features of phyllite stratum and design method of initial support under deep buried condition were made according to the site displacement measurement.
Research results: The proposed scheme of initial support parameters for phyllitc stratum was presented for reference to design and construction of similar engineering through making research on the deformation of surrounding rock and initial support in excavation of tunnel.
Research conclusions: As a result, it was an effective way to control big deformation of surrounding rock by adopting strong rigid support of long anchor and taking initial support measure of net grouting steel fiber concrete to the phyllite stratum with big deformation of surrounding rock.
2006, Vol. 23 
