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2. The geological structure and sliding mode of the slopes in the Yigong landslide source area, Tibet

Author

XIN Peng, WANG Tao, LIU Jiamei, LIU Feng, DU Jianjun, and ZHAO Jianlei

Subjects
geological disaster, yigong landslide, source area, imbricated nappe structure, fault, sliding mode, Geology, QE1-996.5
Abstract

The unstable slopes of BH01, BH02, and BH03 in the Yigong landslide source area in Tibet threaten the safety of major engineering facilities downstream. In order to prevent and control the disaster risk caused by the high-elevation sliding of blocks, it is urgent to analyze the geological structure of the slope in the above-mentioned source area and their deformation trends. Based on the Pleiades digital elevation model with a precision of 2 m and its topographical shadow, this paper draws up evidence from three aspects: quantitative geomorphology, geological structure, and landslide science. In addition, it is preliminarily determined that the source area of the Yigong landslide has four secondary slope units, including the cuesta in the front imbricated thrust-fault zone, the block in the thrust-fault zone, the block in the strike-slip fault zone, and the NE-trending rift zone. There are two primary control structural planes in the slope, dipping southeast and southwest, respectively. The geological survey of the line has confirmed that the above two groups of structural planes are related to thrust faults and strike-slip faults in the imbricated nappe. The NE-trending rift crosscutting the ridge may be related to the recent EW-extensional deformation of the nappe. With the above-mentioned geological structures, the slopes in the Yigong landslide source area show multi-stage and multi-phase deep sliding along the NE-trending rift zone and have the creep-tension-shear sliding mechanism with rock landslide. According to the extension depth of the tensile fractures in the source area, the BH02 block has the potential risk of accelerated slippage. Moreover, the BH03 block is also unstable.

Published
2022
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15. Comparative Analysis of Two Actuators for High Voltage Bypass Switch

Author

Liyan Zhang, Zhao Jianlei, Jiang Jinghua, Zhang Hongtie, Yu Zhu, Yingjie Sun, and Enyuan Dong

Subjects
Materials science, business.industry, Electrical engineering, High voltage, Actuator, business
Abstract

The bypass switch is required to complete the closing operation quickly and accurately protect the transmission line. Therefore, there is a high requirement for the actuator of the bypass switch. According to the characteristics of the bypass switch, the commonly used actuators are compared, and the magnetic force actuator and the motor actuator are initially selected to meet the requirements. Firstly, the characteristics of the magnetic and motor actuator are compared and analyzed in principle. Then, the optimization model of the two actuators is obtained through simulation optimization. Under the same working voltage, the action characteristics of the two actuators, including the action speed, the start time and the output force, are compared. Finally, a comprehensive reference for the selection of the bypass switch actuator is provided.

Published
2020

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