Study on the Progressive Deterioration of Tunnel Lining Structures in Cold Regions Experiencing Freeze–Thaw Cycles

The linings of tunnels in cold regions with long service lives usually have cracks, parts the structure peeling and falling off, which seriously threatens tunnel safety operation. unsaturated freeze–thaw cycle concrete, is main cause structural deterioration, has not received much research attention. During life regions, cycles deteriorate quality its degree presents a gradual distribution circumferential longitudinal directions. An experiment system was adopted to simulate progressive deterioration lining concrete. test results temperature field model show law cycles, concrete realized. Then, bearing capacity tested after deterioration. that ultimate load decreases an increase number cycles. Finally, numerical simulation carried out discuss influence lining. will encourage development leading serious cracking even block spalling. Through this study, we hope provide useful information for prevention control frost damage regions.