Research purposes: There exists uncertainty in the engineering conditions of tunnel with basalt intercalated with the tuff. Adopting the current prospecting method is hard to make clear the exact distribution position of the tuff. This brings the greater difficulty to tunnel construction, so it is necessary to do the research on the characteristics of this kind of surrounding rock and the countermeasures for tunnel construction.
Research methods: By means of researching the physical properties of tuff and all kind of basalt combination relation to the tunnel excavation , and in combination with the geological predicting ahead of the working face，the various support systems far construction，analyzed.
Research results: According to the structural characteristics of the tuff in fractured basalt, seven support systems for construction and tunnel lining structure of different combination relations to basalt and tuff under all kinds of surrounding rock class are presented.
Research conclusions: The construction practice indicates that the construction measures for the different combination states of the fractured basalt and tuff are reasonable, and the effect of the timely dynamic adjustment based on the construction information feedback is favorable.
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