Abstract
in order to study the influence of ground fissures on the construction of expressway, a ground fissure (F1) with a strike of NE20∼45° and length of 120km in Yunnan Province is selected as the research object. The FLAC3D numerical software is used to study the characteristics of displacement and stress. The results show that: (1) under normal fault activity, vertical displacement mainly develops hanging wall. (2) The overall variation law of the surface subsidence curve presents an “s“ type distribution. (3) The stress of the two plates changes with the fracture activity, which is manifested in the stress increasing area in the footwall and the stress decreasing area in the hanging wall.
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