Taking the irregular developed anhydrock in dolomite layer of Yi-Ba section which located in Hangzhou-Lanzhou highway as research object

and adopting test methods such as X-ray diffraction experiment

ion-chromatographic analysis

environmental scanning electron microscopy and energy spectrum analysis tests

it is mainly quantitatively analyzed the damage of anhydrock to the tunnel structure. The result shows that the damage to the tunnel structure mainly displayed in hydration-swelling action

sulfate erosion generated by corrosion and the aggravation of dolomite corrosion by acid environment. On this basis

combining with regional engineering geological condition of this area

this paper proposes the deterioration mechanism of the tunnel concrete protective structure under anhydrock and the coupled corrosion action of the anhydrock and dolomite. Finally

it gives treatment suggestions for the similar engineering

mainly by lowering the groundwater level and improving the performance of the concrete.