中空式混凝土复合防护大板基础抗倾覆稳定研究

The Anti Overturning Stability Research of Hollow Type Concrete Composite Protective Slab Foundation

中空式混凝土复合防护大板基础作为一种新型基础,在输电线路中得到广泛的应用。为了研究其抗倾覆稳定性,采用理论公式推导和有限元模拟相对比分析的方法进行研究。首先,通过普通建筑结构的抗倾覆稳定(即倾覆外荷载产生的弯矩与重力产生的抵抗弯矩的关系),推导出中空式混凝土复合防护大板基础抗倾覆稳定公式。其次,再以大板应力、基础周围土体塑性应变以及位移-荷载曲线为参考进行分析,进而提出中空式混凝土复合防护大板基础抗倾覆修正系数的概念。最终,提出了中空式混凝土复合防护大板基础的抗倾覆稳定修正公式,并为其在输电线路中的应用提供理论依据。

Hollow type concrete composite protective slab foundation was applied more and more widely as a new type foundation in the transmission line. In order to study the anti overturning stability, the method of the theoretical formula and the finite element simulation were used to study it. First, the formula of anti overturning stability which was related to hollow type concrete composite protective slab foundation was pulled initially through the anti overturning stability of ordinary building structure （i. e. the relationship between the moment of overturning load and the moment of gravity）. Secondly, the correction factor of anti overturning stability was put forward, what was based on the result of slab stress and the soil plastic strain and the load-displacement curve. Finally, the formula which was the anti overturning stability of hollow type concrete composite protective slab foundation was pulled to support the application in the transmission line.