Abstract：In order to find a reasonable quantitative criteria to judge the stability of interlayer separation of complex roof in tunnels，the different stresses of structure surfaces and the distribution of interlayers to be separated were simulated and analyzed with ANSYS program to a total of 5×5 sets of orthogonal models considering 5 factors including the rock properties of the complex roof，the tunnel width，the rock thickness of complex roof，the cohesions and the internal friction angles of structure planes. The distribution of the interlayers to be separated was validated by engineering practice，and the mechanism of instability of the structural plane separation was analyzed. Using the separation range caused by the tensile stress in the middle of the structure plane to judge the stability was found to be more reasonable than using the interlayer separation size in the center of complex roof，and the threshold value of the separation range was 0.50–0.75 times of the tunnel width.
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2014, Vol. 33 
