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电力顶管隧道保护是岩土环境土工问题中的重要研究内容;而钻孔灌注桩为非挤土桩,一般对周边环境影响较小。根据施工实例表明在距离电力隧道3 m附近施工3枚钻孔灌注桩;导致电力隧道变形达6.97 mm。为了确保电力隧道的安全,降低钻孔灌注桩对电力隧道的影响。借助有限元分析以及常规监测手段对钻孔灌注桩施工导致电力隧道变形影响的机理展开分析。研究表明,刚灌入的混凝土所产生的附加应力对周围土体有挤压作用,这种挤压作用进而造成电力隧道结构变形、位移。当钻孔桩与电力隧道净间距控制超过5 m,可有效降低对电力隧道的影响。
Electric tunnel pipe tunnel protection is an important issue in the geotechnical environmental geotechnical issues; while the bored pile is a non-compacted pile, generally less impact on the surrounding environment. According to the construction example, three bored piles were constructed at a distance of 3 m from the power tunnel; the deformation of the power tunnel reached 6.97 mm. In order to ensure the safety of power tunnel, reduce the impact of bored piles on power tunnel. The finite element analysis and conventional monitoring methods are used to analyze the mechanism of the deformation of the bored pile caused by electric tunnel deformation. The results show that the additional stress generated by the concrete poured into the concrete has a compressive effect on the surrounding soil, which in turn causes deformation and displacement of the power tunnel structure. When the net spacing between the bored pile and the power tunnel is more than 5 m, the impact on the power tunnel can be effectively reduced.