Prediction Model of Effective Strength of Sulfate-eroded Tunnel Lining Based on Micro-element-Layering Method
LIU Xinrong1,2,3,*, ZHUANG Yang1, ZHOU Xiaohan1,2,3, LIANG Ninghui1,2,3, CHEN Hai1
1 School of Civil Engineering, Chongqing University, Chongqing 400045, China 2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400045, China 3 National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area, Chongqing 400045, China
Abstract: The effective strength of tunnel lining after sulfate erosion is an important basis for evaluating the safety of service tunnels. However, existing sulfate erosion tests, by increasing the concentration of sulfate solution to shorten the test period, make it impossible to predict the effective strength of tunnel lining under sulfate erosion during actual service period. In view of the characteristics of single-side corrosion of tunnel lining, this work put forward the micro-element-layering method. Based on this method, established the effective strength prediction model of tunnel lining considering the time effect. A sulfate-eroded tunnel in Chongqing was selected as the engineering case for analysis. Through 420 days of indoor corrosion test and numerical simulation, the key parameters of the model were solved. Compared with the test results, the change law of the effective lining strength of the tunnel under the condition of overall corrosion and localized arch foot corrosion was further studied. The results show that the effective strength prediction model proposed can obtain the effective strength of corroded lining unimpeded by the size effect, and the calculated results were in good agreement with the experimental results. In the tunnel lining effective strength loss stage, the loss rate was slow first and then fast. Under the same condition, the effective strength loss of the tunnel lining under localized arch foot corrosion was less than that under overall corrosion.
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2025, Vol. 39 
