采空区输电线路中空防护大板计算方法的探讨

The Computational Method About the Hollow Concrete Slab Foundation of Transmission Line in Coal Mine Goaf

从采空区输电线路中空防护大板的工程设计出发,采用倒楼盖法对其内力进行简化计算。首先计算了开孔比对总静力弯矩的影响,计算表明,开孔比越大,总静力弯矩折减越多;再应用屈服线理论对中空防护大板的极限承载力进行分析,得到了极限承载力降低系数,并给出修正后的弯矩分配系数;最后给出工程算例。

Based on the engineering design of the hollow concrete slab foundation of transmissi-on line in coal mine goaf,the method of inverted floor is used to analysis the internal force about the hollow concrete slab foundation.Firstly,the influence of opening ratio on the static bending moment is analyzed,the result reveals that the opening ratio is bigger,the static bending moment is smaller.Then yield line theory is used to get the ultimate resistance of the hollow concrete slab foundation,getting the lowering coefficient of ultimate resistance and the amended allocating coefficient of bending moment.The example is given in the end.