The new county-seat town of Badong in the reservoir area of the Three Gorges Project is located on a huge arcuate slope with a convex bank toward north. The slope is cut by a fault, Badong fault, trending in east-west...The new county-seat town of Badong in the reservoir area of the Three Gorges Project is located on a huge arcuate slope with a convex bank toward north. The slope is cut by a fault, Badong fault, trending in east-west in its back part. It is concerned if the huge arcuate slope is related to mass rock creep, and what is the role of the Badong fault in the formation of the huge arc slope? The Badong fault was put into main consideration in this paper. The data from field investigation were reviewed. Three main features of the Badong fault were summarized: a bedding fault between the Jialingjiang formation (T\-1j) and Badong formation (T\-2b), breccias with compound component, and multiple stages of activity. It was proposed that most of the breccias were formed by fracture-filling. To understand the state of stress and behavior of deformation of the fault during the incision of the Yangtze River as well as the initiation and development of the slope, numerical simulation was conducted. Results indicate that there is a tensional stress zone in the upper part of the fault, and that activity of the fault is dominated by bedding sliding. Opening was also noted in the upper part of the fault in the late periods. The results are consistent with the field observation of the fault. The displacement in the slope is small, which makes us conclude that there is no certain relation between the formation of the arcuate slope and the Badong fault.展开更多
The behavior of matrix converter(MC) drive systems under the condition of MC short-circuit faults is comprehensively investigated. Two isolation strategies using semiconductors and high speed fuses(HSFs) for MC short-...The behavior of matrix converter(MC) drive systems under the condition of MC short-circuit faults is comprehensively investigated. Two isolation strategies using semiconductors and high speed fuses(HSFs) for MC short-circuit faults are examined and their performances are compared. The behavior of MC drive systems during the fuse action time under different operating conditions is explored. The feasibility of fault-tolerant operation during the fuse action time is also studied. The basic selection laws for the HSFs and the requirements for the passive components of the MC drive system from the point view of short-circuit faults are also discussed. Simulation results are used to demonstrate the feasibility of the proposed isolation strategies.展开更多
文摘The new county-seat town of Badong in the reservoir area of the Three Gorges Project is located on a huge arcuate slope with a convex bank toward north. The slope is cut by a fault, Badong fault, trending in east-west in its back part. It is concerned if the huge arcuate slope is related to mass rock creep, and what is the role of the Badong fault in the formation of the huge arc slope? The Badong fault was put into main consideration in this paper. The data from field investigation were reviewed. Three main features of the Badong fault were summarized: a bedding fault between the Jialingjiang formation (T\-1j) and Badong formation (T\-2b), breccias with compound component, and multiple stages of activity. It was proposed that most of the breccias were formed by fracture-filling. To understand the state of stress and behavior of deformation of the fault during the incision of the Yangtze River as well as the initiation and development of the slope, numerical simulation was conducted. Results indicate that there is a tensional stress zone in the upper part of the fault, and that activity of the fault is dominated by bedding sliding. Opening was also noted in the upper part of the fault in the late periods. The results are consistent with the field observation of the fault. The displacement in the slope is small, which makes us conclude that there is no certain relation between the formation of the arcuate slope and the Badong fault.
基金Project(50807002) supported by the National Natural Science Foundation of ChinaProject(SKLD10KM05) supported by Opening Fund of State Key Laboratory of Power System and Generation EquipmentsProject(201206025007) supported by the National Scholarship Fund,China
文摘The behavior of matrix converter(MC) drive systems under the condition of MC short-circuit faults is comprehensively investigated. Two isolation strategies using semiconductors and high speed fuses(HSFs) for MC short-circuit faults are examined and their performances are compared. The behavior of MC drive systems during the fuse action time under different operating conditions is explored. The feasibility of fault-tolerant operation during the fuse action time is also studied. The basic selection laws for the HSFs and the requirements for the passive components of the MC drive system from the point view of short-circuit faults are also discussed. Simulation results are used to demonstrate the feasibility of the proposed isolation strategies.
