A Research On The Anti-shock Simulation Experiment Of Railway Tunnels Going Through Active Fault Zones

For the aim of expanding the urban space, the development of the underground space is drawing more attention in recent years. Our country is one of countries which have more earthquakes than others all over the world, the safety of underground structures during earthquakes has a significant impact on people’s lives and properties and the normal regulation of the city life. A very deep study on tunnels which go through fault zones has been done as so far. But when facing the moving fault zones, people always choose other ways to avoid going through them.Tunnel structure designs and construction countermeasures on tunnels going through active fault zones have not formed a systemic theory, so it’s so necessary to pay attention on the study of this field.Basic research methods on the seismic resistance and seismic absorption of tunnels and underground structures are mainly about theoretical analyses, model tests and prototype observations. Throughout the domestic and foreign design experience of tunneling which going through active fault zones, “The over excavation design” and “the articulated design” are the two main measures for the tunnel engineering anti-breakage designsThe article is based on the single track railway tunnel from Dunhuang to Golmud. The Kuokesa tunnel is the main study subject. Two groups of simulation experiments are done for the research, they are the one with shock-absorbing layers and the other one without them. The content of the simulation experiments are: the production of the experimental box, the selection and the production of the rock similar material, the preparation of the test components and the adjustment of the data acquisition system, the specific process of simulation experiments, the record of the damage details of secondary linings, the data processing and comparison and so on.We can get the damage details and damage patterns of secondary linings when the tunnel go through active fault zones. Shock-absorbing layers and shock-absorbing joints and the combination of them are compared to evaluate the best measure for the seismic absorption.