煤矿采空区地段高压输电线路铁塔地基处理的研究

Research on Foundation Treatment of High Voltage Transmission Towers Erected above Goaf of Coal Mine

针对矿业开采特别是煤矿开采对其经过的高压输电线路安全运行的威胁和危害,在深入研究采空区地面变形特征、形式、规律等影响线路杆塔安全运行的关键因素基础上,开发了两套采空区上输电铁塔改造加固技术:可调式联体混凝土井字梁基础改造加固技术;可调整井字钢梁基墩架构改造加固技术。还定义了两个描述矿区特征的参数:深厚比和岩厚比,使人们可直接通过分析矿区特征来了解采空区地表变形。最后针对不同的地表变形特征,推荐了相应的杆塔基础加固改造方案。

To eliminate the damage to secure operation of HV transmission line which is caused by exploitation of coal mine, based on detailed analysis of such factors as deformation characteristic, form and regularity of the ground above the goaf which directly affect the security of HV transmission towers, two kinds of technologies to reinforce the transmission towers erected above the goaf are researched and developed, i.e., the foundation renovation and reinforcement technology with adjustable associative concrete criss-cross beam and the foundation pier structure renovation and reinforcement technology with adjustable steel criss-cross beam. Besides, two characteristic parameters describing the feature of mining area, namely the ratio of average thickness of the mined coal bed to average thickness of the overburden over the mined coal bed and the ratio of average thickness of the rock within the overburden to the thickness of overburden, are defined, so it is possible to understand the surface deformation of the goal by analyzing the feature of the mining area. Finally, according to different surface deformation characteristic some renovation schemes are recommended.