风电机组基础环周边混凝土受力机理分析及基础加固

基础环在风电机组基础中得到了广泛应用,其中基础环周边混凝土存在开裂、冒浆等共性问题,需要深入分析混凝土的受力机理并寻求解决思路.首先,结合实际风机运行情况给出了基础环传递给周边混凝土的非均匀作用力形式,并解析了混凝土的应力场;其次,考虑在基础台柱混凝土外侧施加围压,对比分析施加围压前后混凝土的应力场及位移场的变化;最后,提出工程中实现加载围压的方案,并给出钢环的相关设计参数.工程算例结果表明:施加围压后,混凝土径向压应力会小幅增大,环向拉应力却显著降低,可以有效抑制裂缝的产生及扩展,同时还可增强钢筋与混凝土的黏结性能.研究成果可为风机基础加固治理提供参考建议.

Study on Force Analysis and Foundation Reinforcement of Concrete around Fan Foundation Ring

: The foundation ring has been widely used in the wind power foundation, among which the concrete around the foundation ring has some common problems such as cracking and bleeding. It is necessary to analyse the stress mechanism of the concrete and find solutions. First, combined with the actual operation of the fan, give out the non-uniform force form transmitted by the foundation ring to the surrounding concrete, and analyse the stress field of the concrete; Second, compare the stress field and displacement field of concrete before and after confining pressure are analysed; Finally, the scheme of loading confining pressure in engineering is put forward, and the relevant design parameters of steel ring are given. The results of engineering examples show that the radial compressive stress of concrete increases slightly and the circumferential tensile stress decreases significantly after confining pressure is applied, which can effectively inhibit the generation and expansion of cracks, and can also enhance the bond performance of reinforcement and concrete. The research results can provide reference suggestions for the reinforcement of fan foundation.