摘要
三峡库区三叠系巴东组(T2b)泥灰质岩石岩溶是移民迁建中发现的重大工程地质问题。泥灰质岩石中的构造非常复杂,包括老构造、新构造和表生构造,它们共同控制了岩溶作用。老构造中,褶皱和断裂带等局部构造控制着岩溶的重要部位和重要层位,节理和层理等小构造使岩溶普遍存在。新构造时期地表隆升和河流切割使岩体卸荷松动,岩溶通道扩宽。表生岩溶构造加密了岩溶通道,使岩溶作用增强。三峡库区泥灰质岩石斜坡带地质灾害形成的机理遵循着构造控制下岩溶发育的规律性,致使岩溶地质灾害具有范围广、规模大和结构复杂的特点。岩溶地质灾害的形式包括地面不均匀沉降、地裂缝、滑坡、崩塌、泥石流和地面塌陷。
The karst in mud limestone of Triassic Badong formation(T_2b) is the serious engineering geological problem newly discovered in the population resettlement project in the Three Gorges Reservoir region. There are very complex structures in mud limestone, involving old structures, neostructures and surface deformation structures, which coordinately control the karstification. In the old structures, the local structures such as folds and fault zones control the important segments and layers of karstification; and the mini structures such as joint and layer face popularize the karstification. The surface uplift and river-cutting in neo-tectonic period put forward the unload and loose of rockmass, widening of karstification paths. The surface deformation structures densify the karstification paths and intensify the karstification. The mechanism of karst hazards yields to the regulation of structure controlling over karstification in mud limestone terrain, Three Gorges Reservoir region, which brings about karst hazards with features of broad range, huge scale and complex structure. The types of karst hazards involve uneven subsidence, fissure, landslide, collapse, mudflow and cave-in.
出处
《水文地质工程地质》
CAS
CSCD
2004年第6期43-47,共5页
Hydrogeology & Engineering Geology
基金
三峡移民开发局基金项目(9707
9904)
关键词
构造
岩溶
地质灾害
泥灰质岩石
三峡库区
structure
karst
geo-hazard
mud limestone
the Three Gorges Reservoir region
