Experimental Study On Influence Factor Of Loess(?) Wind-induced Fatigue Eynamic (?)

The12thfive-year plan has entered into the fourth year, and the wind powergeneration in our country has being developed towards direction with healthy and orderly.In2013, national energy conference explicitly put forward to develop the new energy andrenewable energy, and coordinated development of wind power industry, China hasincreased the18million kilowatt of new power total installed capacity last year. In thecoming years, the country will continued to increased the intensity of land and offshorewind power development, large-scale and high efficiency transformation will become atrend for wind turbines, over2megawatt of land and over3megawatt of offshore windpower will be the lead model in future market. As the supportive polices of new energyindustry improved gradually, the related research and manufacturing strength furtherenhanced, the prospects of wind power development can be expected. There is a largeamount of wind energy resources in the Inner Mongolia Autonomous Region, most regionsare qualified for super-huge wind farm, wind power integration installde capacity ismaximum in the country, the region has been the main force of the West-East PowerTransmission. However, the loess is widely covered in the mid-western region of China,and the particular physical mechanical property of the loess is a challenge, whichconsequentially brings a big trouble in wind power construction.This paper foucused on a experimental study on the damage pattern of regional loessfoundation under the wind-induced fatigue loading and its influence factors.First,according to a wind power project cases, it happened in mid-western of Inner Mongolia.According to the theory of dynamics and tall and slender structure design, equivalentsingle mass model is built to simulating the wind turbine, and calculated the theoreticalanalytic results of wind-induced fatigue loading on foundation bottom which compare withthe numerical simulation results, to verify loading pattern of wind-induced fatigue;Secondly, through static triaxial test to simulate the different initial moisture contents oflosses foundation, to summarize the relation between shear strength or stiffness andmoisture content; Furthermore, according to wind-induced fatigued loading formdetermined by previous research results, a gravity shallow foundations for example, through dynamic triaxial tests to simulate the influence of the moisture content and windload duration, to explore to the dynamic response and its stability of the turbine loessfoundation, to analysis the change and the development of internal foundations dynamicstress and strain diffusion of fatigue loads which caused by wind-induced. By means offatigue damage mechanics theory, establishing the relationship among the boundaries pointof the foundation soil fatigue, modulus, moisture content, wind-duration time or otherfactors, to provide experimental basis, such as influence factors and dynamic stability ofthe wind turbine footings.