关键词: 地面下沉, 地裂缝, 深井抽水

Abstract: Basic features of the ground fissure zones which have occurred in the Xi'an city area since late 1970's are described by using field observations and survey data. The focus is put on expounding the spatial-temporal relationship between the dynamic deep-well water level changes, inhomogeneous ground subsidence and ground fissure activities. It is suggested that the large-scale ground subsidence induced by overextraction of confined ground water is the primary cause of the ground fissure zones in the Xi'an city while the local geological conditions play a controlling role to the development of these fissure zones.

Key words: Land subsidence, Ground fissure, Deep-well water extraction