摘要
三峡库区地表巴东组泥灰岩地层,大范围内岩体结构松动。为了查明原因,从沉积环境以及沉积地层进行分析,得出的结论为:嘉陵江组顶部膏岩地层在临江部位发生溶蚀,溶腔顶部巴东组地层在重力作用下发生坍塌,导致地表岩体变形破坏。巴东组泥灰岩地层受重力和蠕变作用后,发育多组垂直裂隙,使地表岩层表现为整体性松动现象。因此地表岩体结构松动破碎的原因是深部石膏层岩溶塌陷与表生溶蚀改造作用共同导致的结果,前者为控制因素,后者为叠加效应。
The rock mass structure of Badong marlite strata becomes loose in Three Gorges Reservoir Area. In order to find out the causes, the sedimentary environment and sedimentary formation are analyzed. It is concluded that the gypsum strata of Jialingjiang group by the river is corroded and the upper strata of Badong group collapses under the gravity action, resulting in distortion and destruction of rock mass on slope. After action of force, the Badong marlite strata developed into many groups of vertical cracks and the rock mass of earth surface became loose. Therefore, the causes are the karst collapse of deep gypsum strata and surface erosion and transformation,the former is the controlling factor and the latter exerts a superposition effect.
出处
《人民长江》
北大核心
2010年第2期6-8,17,共4页
Yangtze River
基金
山东省高校沉积成矿作用与沉积矿产重点实验室(山东实验大学)开放基金项目(DMSM200801)
关键词
泥灰岩地层
膏溶塌陷
结构沉陷
巴东组
三峡库区
marlite strata
karst collapse of gypsum strata
structure subsidence
Badong group
Three Gorge Reservoir Area
