THE INFLUENCE OF TUNNELLING SIZE AND SHAPE ON LIMIT DISPLACEMENTS
洞室大小和形状对极限位移的影响

The limit displacements of tunnelling is influenced by surrounding rock, tunnelling size and shape, supported structure form and thickness, constructing method and failure form. The limit displacements of standard railway tunnel lining are imitated. The imitated results are analyzed and compared with the permitted relative displacements of railway tunnel norms.