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三峡库区岩溶型地面塌陷问题影响到三峡工程的顺利进行,正确掌握它的形成机理及特点有利于其地质灾害的预防。以奉节新县城为例,从地形地貌、地层岩性、微构造及水文地质几方面论述其形成机理,并认为溶蚀作用是形成地面塌陷的关键因素;同时总结了地面塌陷的几大特点。
The problem of karst ground subsidence in the Three Gorges Reservoir Area affects the smooth progress of the Three Gorges Project. To correctly understand its formation mechanism and characteristics is conducive to the prevention of geological disasters. Taking Fengjie New County as an example, the forming mechanism is discussed from topography, stratigraphy lithology, micro-structure and hydrogeology. It is also considered that dissolution is the key factor for the formation of ground subsidence. Several major characteristics of subsidence are also summarized.