The mountainous areas （mountain, plateau and hilly area ） cover than 85% of total land territory of China.Nature and humanity in very mountainous ares has its own geographic characteristics.In the process of industr...The mountainous areas （mountain, plateau and hilly area ） cover than 85% of total land territory of China.Nature and humanity in very mountainous ares has its own geographic characteristics.In the process of industrialization and urbanization in China, realizing the sustainable development of the mouniainous areas, optimizing man-land system, and adopting and continuously developing corresponding economic modes of the mountainous areas with multi-functions of economy, ecalogy, culture and society to chararacterize production content, mode of production. mode of operation is not only helpful to econonty, society and ecological value and is of great aesthetic value,but also solve the technological problems of the subject of starting undertaking to finally transform the regional resource advantage of the mountainous area into the advantage of capital and technology for economic development and to get rid of the contradiction between underdeveloped economy and abundant resources. This paper takes the Three Gorges Reservoir（TGR） area for example to show that it＇s of great practical and theoretical significance ,regional distribution,variety structure and quality structure.展开更多
The Xiannvshan fault zone, lying along the western margin of the Huangling anticline, is one of the most important fault zones in the Three Gorges reservoir area. The fault experienced strong activity during the Cenoz...The Xiannvshan fault zone, lying along the western margin of the Huangling anticline, is one of the most important fault zones in the Three Gorges reservoir area. The fault experienced strong activity during the Cenozoic Era. The question of whether the fault zone goes through the Yangtze River has been one of the key problems faced in previous studies as it has a significant influence upon the assessment of geological hazards and earthquake stability in the reservoir area. Based on tectonic and geomorphic observations along the fault zone between the Baixianchi village in Changyang county and Huangkou village in Zigui town, together with the comparisons between the geology in Guizhou and Quyuan town in the north bank of the Yangtze River and the Xiannvshan fault zone, it is suggested that the north end of this fault zone is located around Huangkou village and does not go through the Yangtze rivers northward. The evidence is as follows: ① On the basis of field data collection, it is found that the Xiannvshan Fault zone, which stretches 80km, underwent thrust movement in the Cenozoic period, resulting in ravines and fault scarps, topographically. Whereas, on the northern bank of the Yangtze River, faults are rarely found, and most of the faults are developed in the Jurassic strata,without topographical effects. Therefore, the Xiannvshan Fault zone has not stretched to the north bank of the Yangtze River. ② The fault gouge and tectonite zone were found developed on the Xiannvshan Fault zone at Baixianchi village, but only a tectonite zone was found at Zhouping village. There are also some branch faults close to the northern end of the fault zone. So, the activity of the fault zone weakened from south to north in Cenozoic. The fault zone extends northward and dies out at Huangkou. It doesn't stretch forward any longer as indicated by continuous strata, sparse joints, and small folds, etc.展开更多
Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used ...Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used to trace the change in strength of remodeled soils of slip surfaces in the Three Gorges area. Results show that there is a release of alkali metals and concentration of clay minerals on the surface. During the tests, potassium ions were released, the cementation was reduced, and the ratio of interlayer minerals varied associated with strength change. Accordingly, illites or montmorillonite-illite mixtures turned into montmorillonite. So the strength change originates from the release of alkali metal ions on molecular scale that leads to the concentration and transition of clay minerals on meso-scale. The evolution of slip surface and soil strength is a typical process involving multi-scale processes of structure changes and chemo-mechanical coupling.展开更多
文摘The mountainous areas （mountain, plateau and hilly area ） cover than 85% of total land territory of China.Nature and humanity in very mountainous ares has its own geographic characteristics.In the process of industrialization and urbanization in China, realizing the sustainable development of the mouniainous areas, optimizing man-land system, and adopting and continuously developing corresponding economic modes of the mountainous areas with multi-functions of economy, ecalogy, culture and society to chararacterize production content, mode of production. mode of operation is not only helpful to econonty, society and ecological value and is of great aesthetic value,but also solve the technological problems of the subject of starting undertaking to finally transform the regional resource advantage of the mountainous area into the advantage of capital and technology for economic development and to get rid of the contradiction between underdeveloped economy and abundant resources. This paper takes the Three Gorges Reservoir（TGR） area for example to show that it＇s of great practical and theoretical significance ,regional distribution,variety structure and quality structure.
基金funded by Geological Disaster Preventing Project of the Third Stage of Three Gorges Project of Ministry of Land and Resources,China (SXKY3-5)the Basic Research Project of the National Non-profit Research Institutes,Institute of Geology,CEA(IGCEA1001)
文摘The Xiannvshan fault zone, lying along the western margin of the Huangling anticline, is one of the most important fault zones in the Three Gorges reservoir area. The fault experienced strong activity during the Cenozoic Era. The question of whether the fault zone goes through the Yangtze River has been one of the key problems faced in previous studies as it has a significant influence upon the assessment of geological hazards and earthquake stability in the reservoir area. Based on tectonic and geomorphic observations along the fault zone between the Baixianchi village in Changyang county and Huangkou village in Zigui town, together with the comparisons between the geology in Guizhou and Quyuan town in the north bank of the Yangtze River and the Xiannvshan fault zone, it is suggested that the north end of this fault zone is located around Huangkou village and does not go through the Yangtze rivers northward. The evidence is as follows: ① On the basis of field data collection, it is found that the Xiannvshan Fault zone, which stretches 80km, underwent thrust movement in the Cenozoic period, resulting in ravines and fault scarps, topographically. Whereas, on the northern bank of the Yangtze River, faults are rarely found, and most of the faults are developed in the Jurassic strata,without topographical effects. Therefore, the Xiannvshan Fault zone has not stretched to the north bank of the Yangtze River. ② The fault gouge and tectonite zone were found developed on the Xiannvshan Fault zone at Baixianchi village, but only a tectonite zone was found at Zhouping village. There are also some branch faults close to the northern end of the fault zone. So, the activity of the fault zone weakened from south to north in Cenozoic. The fault zone extends northward and dies out at Huangkou. It doesn't stretch forward any longer as indicated by continuous strata, sparse joints, and small folds, etc.
基金supported by the National Natural Science Foundation of China (Grant No. 40171005)the Key Project of National Natural Science Foundation of China (Grant No. 41030742)+1 种基金Foundation of Key Laboratory of Mountain Hazards and Earth Surface Process of Chinese Academy of Sciencesthe Natural Science Foundation of U.S.A. (Grant No. 0324543)
文摘Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used to trace the change in strength of remodeled soils of slip surfaces in the Three Gorges area. Results show that there is a release of alkali metals and concentration of clay minerals on the surface. During the tests, potassium ions were released, the cementation was reduced, and the ratio of interlayer minerals varied associated with strength change. Accordingly, illites or montmorillonite-illite mixtures turned into montmorillonite. So the strength change originates from the release of alkali metal ions on molecular scale that leads to the concentration and transition of clay minerals on meso-scale. The evolution of slip surface and soil strength is a typical process involving multi-scale processes of structure changes and chemo-mechanical coupling.
