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在高纬度多年冻土区采用灌注桩基础时,由于对多年冻土中温度的分布情况、桩基施工后对地温的影响认识不够,致使设计偏于保守。本文结合在高纬度多年冻土地区建设的220kV塔河—漠河送电线路新建工程采用灌注桩基础的实际情况,在对多年冻土进行物理力学试验的基础上,通过对桩身混凝土温度监测、场地地温观测和桩基周边冻土地温变化过程的监测,对高纬度多年冻土区的桩基础设计、施工有了进一步认识,使桩基础设计具有针对性、科学性与经济性。
At the high latitude permafrost zone, when the bored pile foundation is adopted, due to the temperature distribution in the permafrost, the influence of the post-construction on the geothermal temperature is not enough, which leads to the conservative design. Based on the physical and mechanical tests of permafrost based on the actual conditions of the new construction of 220kV Tahe-Mohe transmission line constructed in high latitude permafrost regions, the paper analyzes the concrete temperature monitoring, Ground temperature observation and permafrost permafrost piles around the pile foundation monitoring, the design and construction of the pile foundation in high latitude permafrost area has been further recognized, so that the pile foundation design is targeted, scientific and economical.