地质灾害形成的内外动力耦合作用机制  

COUPLING EFFECT MECHANISM OF ENDOGENIC AND EXOGENIC GEOLOGICAL PROCESSES OF GEOLOGICAL HAZARDS EVOLUTION

作　　者：李晓[1] 李守定[1] 陈剑[1] 廖秋林[1] 

机构地区：[1]中国科学院地质与地球物理研究所工程地质力学重点实验室,北京100029

出　　处：《岩石力学与工程学报》2008年第9期1792-1806,共15页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2002CB412702);国家自然科学基金资助项目(40702052);中国科学院知识创新工程重要方向项目(KJCX3-SW-L1;KZCX2-YW-109)

摘　　要：以三峡水电工程库区大型山体滑坡为研究对象,从三个方面研究地质灾害形成的内外动力耦合作用机制:(1)通过对大量古滑坡的空间分布特征和发育时间的研究,寻求滑坡时空分布的控制因素,揭示滑坡发育演化与地球内外动力耦合作用的关系;(2)通过对大型基岩滑坡滑带发育演化过程的研究,提出滑带形成演化的典型四阶段模式及其内外动力耦合作用机制;(3)以三峡库区千将坪滑坡为例,通过对泥化夹层和滑带结构的精细地质分析和测试,重建滑带形成演化过程,研究千将坪滑坡发育及滑带形成的内外动力耦合作用机制。研究结果表明,新构造运动和第四纪气候变化的耦合作用是三峡库区发育多期大型古滑坡的主要动因;层间剪切作用和水岩相互作用的耦合是基岩滑坡滑带形成演化的主控因素;应重视三峡库区新生滑坡的研究,特别是对重点地层的层间剪切带地质力学特性的研究,将是发现和预测新滑坡的重要途径之一。Focused on the large-scale landslide hazards in the Three Gorges Project（TGP） reservoir area, coupling mechanism of the endogenic and exogenic geological processes of geological hazard is studied. The following three aspects are examined. （1） By analysing the landslide space-time distribution characters and its control factors, the relations between the landslide formation and the Earth＇s endogenic-exogenic geological processes are illustrated. （2） Slipping zones are the control factor of rock slide development. Based on the study of sedimentary formation, tectonic evolution and earth＇s exogenic geological process, four-phase patterns of slipping zone formation and evolution are put forward; and the coupling mechanism of the Earth＇s endogenic-exogenic geological processes is explained. （3） Qianjiangping Landslide is the first rock slide after impounding of TGE Through the fine description and test on the slipping zone and interbedded shear zone, slipping zone formation process of Qianjiangping Landslide is rebuilt. The effect of the endogenic-exogenic geological processes on slipping zone formation is studied. The conclusions are shown as follows： （1） the coupling of neotectonic movement（intense tectonic up and river downcutting） and Quaternary climatic change（intense rainfall） is the main dynamic factor of many large-scale landslides development in TGP reservoir area; （2） the coupling of interbedded shear effect and water-rock interaction is the control factor of slipping zone formation in rock sliding; and （3） it is of great importance to study the neonatal landslide in TGP reservoir area. The geomechanical study on interbedded shear zone in easy-slipping strata is helpful to discover and forecast neonatal landslides.

关 键 词：工程地质 地质灾害成因 地球内外动力 耦合作用 滑坡 三峡工程 

分 类 号：P642[天文地球—工程地质学]