Deformation and Stability Analysis of Expansion Soil Tunnel Under the Effect of Humidification
Under the effect of humidification,the interaction between the expansive surrounding rock and water directly affects the stability of the tunnel,leading to tunnel diseases.In order to clarify the characteristics of surrounding rock expansion and summarize the deformation law of expansive soil tunnels under the effect of humidification,this paper takes the Zaosheng No.3 Tunnel as the background,and uses a combination of indoor experiments and numerical simulations.Based on the theoretical basis of simulating the humidity field with the built-in temperature field in ABAQUS,the deformation and stability changes of tunnel surrounding rock under seven working conditions and local expansion at different spatial positions are analyzed.The conclusions are as follows:the increase in water content intensifies the deformation of the surrounding rock at the arch crown and suppresses the deformation of the surrounding rock at the inverted arch;when there is local expansion,the deformation of the surrounding rock in the expansion area increases accordingly;the most unfavorable part under the effect of humidification is the arch,followed by the side wall;when the arch crown and inverted arch are subjected to expansion forces simultaneously with the side walls and inverted arch,the initial support of the tunnel is in the most dangerous state.The research results can effectively guide the deformation control of surrounding rock and lining structure design of expansive soil tunnels.
expansive soil tunnelhumidification effectsurrounding rock deformationhumidity field simulationstability calculation
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