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Abstract Taking Shuanghekou tunnel of Anjing expressway as engineering background，focused on the shallow section with unsymmetrical loading of multi-arch tunnel，the stress distribution of wall-rock is discussed under the combined effect of geostress and slope sliding. In order to meet the need of practice，a nonlinear method has been proposed to decompose the monitoring data；and the function between the stress and the deformation of wall-rock is established. At the same time，the remaining fluctuations is used to analyze the abnormal phenomenon in construction. The results show that when the shallow section with unsymmetrical loading of multi-arch tunnel is in the combination action of overlying load and sliding slope，the wall-rock and supporting structure，which are located in the tail of the most dangerous sliding surface，will have the largest deformation under mixed loading of tension and shearing. It is more obviously explained by monitoring data tendency item when eliminating construction and other influencing factor. Thus，the slope sliding must be taken into account when the tunnel goes through the wall-rock close to the most dangerous sliding surface.
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Received: 04 June 2010
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2011, Vol. 30 
