Abstract The interaction between rockmass and support is one of the key topics of tunnel research since the temperature change of a concrete lining will affect the interaction between the tunnel rockmass and support: that is to say, the lining structure will expand or shrink when the temperature of the concrete lining increases or decreases due to the passive resistance caused by rockmass confinment. By means of a simplified circular tunnel analysis model, a calculation formula for the passive rock resistance varying with the lining temperature is obtained, the factors affecting the passive rock resistance are analyzed, and the measured data obtained from an existing tunnel lining replacement project are verified. The research results show that: the passive rock resistance under temperature action is a function of the lining temperature variables, lining material parameters, geometrical parameters, and rockmass material parameters, and it is available for quantitative calculation; the passive rock resistance increases rapidly in the primary stage of lining installation because of the hydration heat effect, with a peak value around 0.4MPa, while it decreases gradually with the dissipation of hydration heat. Based on the research results, a temperature correction method is available for monitoring the loosening rock pressure at site.
Abstract：
The interaction between rockmass and support is one of the key topics of tunnel research since the temperature change of a concrete lining will affect the interaction between the tunnel rockmass and support: that is to say, the lining structure will expand or shrink when the temperature of the concrete lining increases or decreases due to the passive resistance caused by rockmass confinment. By means of a simplified circular tunnel analysis model, a calculation formula for the passive rock resistance varying with the lining temperature is obtained, the factors affecting the passive rock resistance are analyzed, and the measured data obtained from an existing tunnel lining replacement project are verified. The research results show that: the passive rock resistance under temperature action is a function of the lining temperature variables, lining material parameters, geometrical parameters, and rockmass material parameters, and it is available for quantitative calculation; the passive rock resistance increases rapidly in the primary stage of lining installation because of the hydration heat effect, with a peak value around 0.4MPa, while it decreases gradually with the dissipation of hydration heat. Based on the research results, a temperature correction method is available for monitoring the loosening rock pressure at site.
YING Guo-Gang-1,
2 ,
ZHANG Ding-Li-1 etc
.Research on the Effects of Temperature on the Interaction Between Rockmass and Support[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(1): 69-75
2015, Vol. 52 