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The ice damage occurs frequently in cold and dry region of western China in winter ice period and spring thawperiod. In the drift ice condition, it is easy to form different extrusion force or impact force to damage tunnellining, causing project failure. The failure project could not arrive the original planning and construction goal,giving rise to the water allocation pressure which influences diversion irrigation and farming production inspring. This study conducts the theoretical study on contact-impact algorithm of drift ices crashing diversiontunnel based on the symmetric penalty function in finite element theory. ANSYS/LS-DYNA is adopted as theplatform to establish tunnel model and drift ice model. LS-DYNA SOLVER is used as the solver and LSPREPOSTis used to do post-processing, analyzing the damage degrees of drift ices on tunnel. Constructingphysical model in the experiment to verify and reveal the impact damage mechanism of drift ices on diversiontunnel. The software simulation results and the experiment results show that tunnel lining surface will formvarying degree deformation and failure when drift ices crash tunnel lining on different velocity, different plansize and different thickness of drift ice. The researches also show that there are damages of drift ice impact forceon tunnel lining in the thawing period in cold and dry region. By long time water scouring, the tunnel liningsurfaces are broken and falling off which breaks the strength and stability of the structure.

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