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以某采煤沉陷区内的典型输电铁塔及其复合防护板基础工程为背景,考虑地基-基础-上部铁塔结构的共同作用,对不同板厚复合防护板基础的抗采动变形性能进行了研究,并引入“保护作用”的概念,对独立基础和复合防护板基础的抗变形性能进行了分析。研究表明,设置复合防护板后,与独立基础相比,可明显减少铁塔支座的水平位移及上部结构的应力,支座位移与结构应力随着复合大板厚度的增大而减小,其减小的幅度随着板厚的增大而趋缓,当板厚达到一定数值以后几乎不再减小。提出的复合防护板的厚度可取铁塔基础长向根开的1/45～1/35的建议,以供采煤沉陷区内复合防护板基础的设计参考。
Taking the foundation of a typical transmission tower and its composite shield in a mining subsidence area as a background and taking the combined effect of the foundation-foundation-upper tower structure into consideration, the anti-mining deformation behaviors of the foundation with different thickness are studied , And introduced the concept of “protective effect” to analyze the anti-deformation performance of foundation of independent foundation and composite fender. The results show that compared with the independent foundation, the horizontal displacement of the tower support and the stress of the superstructure can be obviously reduced after the composite protective plate is set up. The displacement of the support and the structural stress decrease as the thickness of the composite slab increases The decreasing amplitude slows down with the increase of plate thickness, and almost no longer decreases when the plate thickness reaches a certain value. The thickness of the composite protective plate proposed can be taken from 1/45 ~ 1/35 of the long-root of the tower foundation for the design reference of the composite protective plate foundation in the subsidence area of coal mining.