Experimental Study On Dynamic Response Of Loess Foundation Under Wind-induced Fatigue Loading In The Western Of China

During the12th five-year plan, the wind power technology in China will be transformed gradually from the quantity to the quality, and in the future five years, six onshore wind power bases is planned to be built with a total installed capacity of over70millions kilowatts. Thus, it is necessary to conduct the science and technology development and innovation in the design of the large wind farm and the wind turbines of high reliability and efficiency to provide the technical support for the national construction of the large wind farms. The wind energy resources which can be developed in the Inner Mongolia Autonomous Region take the proportion of50%in the total resources in China, and it predicts the total installed capacity of wind power in2015in Inner Mongolia will reach over33millions kilowatts. However, the loess is widely covered in the midwestern region of China and the physical mechanical properties of the loess is quite special, which brings a great challenge for the construction of large wind power farms in the loess district of the midwestern regions.Wind farm has its special underground "living conditions", in the past most of the studies was on wind turbine foundation designing, or the upper structural damage in wind turbine tower internal caused by wind-induced fatigue loading. The research on wind environment caused by the wind in turbine foundation soil fatigue destruction is also during the blank stage. This paper aims Mid-west Inner Mongolia Environmental Simulation and Experimental wind load equivalent, to experimental study the damage regular pattern of regional loess foundation under the wind-induced fatigue. There is one of a construction wind farm in Mid-west, Inner Mongolia, for example, conduct full investigation with the wind farms have been built on the Project or the proposed planning project, and collecting nearly four decades weather and other environmental conditions about Yikezhaomeng, Bayanaoer League, Wulanchabu Union, Xilinguole League Hohhot, Baotou, Wuhai City within the territory of Inner Mongolia Autonomous Region, combined with field measurement research, analyze and summarize the weather conditions such as harsh environments appeared nearly last four decades, to conclude the most reasonable wind-induced fatigue loading forms of the regional wind farm construction, and through dynamic triaxial experiments to simulate the equivalent. Furthermore, in order to gravity shallow foundations for example, through simulation of wind-induced fatigue loads in dynamic triaxial test, accounting to the dynamic response and its long-term stability of the wind turbine loess foundation, to analysis the change and the development of internal foundations Dynamic Stress and Strain diffusion of fatigue loads which caused by wind-induced. Use the theory of fatigue damage mechanics, establishing the relationship among the boundaries point of the foundation soil fatigue, modulus, wind-induced fatigue loading equivalent form, duration, load amplitude or other factors, to provide theoretical guidance on the areas, such as dynamic stability of the wind turbine footings under the wind environment and the evolution or safety prevention about cataclysm induced by wind.