| With the widespread use of clean energy,wind power generation has developed rapidly in my country due to its advantages of convenient construction,flexible site selection,and less impact on the environment.A power generation building that converts wind energy into electrical energy,and the motor foundation bears the role of supporting the wind turbine and dispersing the load,its importance is self-evident.A considerable part of the foundation structure of wind turbines in our country adopts the foundation ring expansion foundation.The foundation ring is an important component that connects the upper tower and transmits the load to the foundation of the wind turbine.Whether the anchoring performance is good or not is one of the important factors to ensure the safety and stability of the wind turbine.one.However,the existing literature lacks the research on foundation ring anchorage,and the design and construction draws on other industry standards.There is a certain blindness in the actual design and safety assessment.In practical projects,it is often found that the concrete around the foundation ring has defects due to the unsatisfactory construction quality.and other problems,which will affect the safe operation of wind turbines.Therefore,this paper studies the anchoring mechanism of the foundation ring,the force characteristics of the equivalent structure,and the optimization design of the structure.The main contents and results are as follows:(1)Through the anchoring mechanism of the foundation ring.By analyzing the comparison of domestic and foreign references,the actual stress form of the fan foundation ring is between the exposed column foot and the shallow buried column foot.Through extreme assumptions,the stress analysis of the two working conditions is carried out,and the load distribution law of the foundation ring is found.(2)The safety of the foundation of the wind turbine was reviewed,the numerical model was established,the foundation stress and damage were calculated and analyzed,and the safety of the foundation structure of the wind turbine was evaluated.(3)The local pressure failure mechanism of the fan foundation was studied,and the numerical model of related defects was established.The results show that when the concrete near the foundation ring loses its cohesive force,it will have a greater impact on the stress field near the foundation ring,and it will decrease sharply.Structural bearing capacity,as the base ring bottom flange continues to disengage,the sidewall stress increases less significantly.(4)Optimized design and numerical simulation of the fan foundation structure,studied the improvement of the number of studs on the stress and damage of the foundation concrete,analyzed the effect of the optimization of the stud structure on reducing the relative displacement of the foundation ring and the concrete,and studied the reduction due to the existence of The distribution law of the relative displacement caused by the defect area is designed to optimize the stud structure,and the result has great engineering application value for the design and construction of the foundation ring fan.(5)Combined with the actual engineering and the damage characteristics of the fan foundation,three detection technology evaluation schemes,including the laser displacement detection of the foundation ring,the ultrasonic phased array,and the cross-hole acoustic wave CT tomography detection,which can be used to detect the anchoring performance of the fan foundation,are proposed.It can check the anchoring risk of the foundation ring of a single wind turbine,and can be used for the rapid assessment of the foundation anchoring level of a large number of wind turbines in wind farms,which provides a guarantee for the safe operation and management of wind power enterprises. |
