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青海—西藏±500kV直流联网输电线路工程跨越整个青藏高原,其生存环境不可避免与冻土有着紧密联系,冻土特有的冻胀、融沉特性给线路的勘测、设计、施工及后期运营带来了极大挑战。本文对取自青藏高原的原状和重塑冻土样样品进行了物理力学试验。结果表明:同种土在不同含冰量下,随含冰量的增大,则冻融特性敏感性增强;不同性质的土,在含冰量相同的情况下,颗粒越细,则冻融特性越敏感。同时,分析认为:塔基地质环境、不良冻土现象、不同地貌单元、冻土的热稳定性特征及施工作业便捷性等都是影响塔基稳定性的重要因素。
Qinghai-Tibet ± 500kV DC Grid Transmission Line Project Spanning the entire Qinghai-Tibet Plateau, its living environment is inevitably linked with the frozen soil. The unique frost heave and thaw sinking characteristics of the Qinghai-Tibet line brought the investigation, design, construction and post-operation of the line A great challenge. In this paper, physical and mechanical tests were carried out on undisturbed and remolded samples taken from the Qinghai-Tibet Plateau. The results show that the same type of soil with different ice content, with the increase of ice content, the sensitivity of freeze-thaw characteristics enhanced; different properties of soil, ice content in the same circumstances, the finer, then freeze-thaw The more sensitive the feature. At the same time, the analysis shows that the thermal stability of tower base geological environment, adverse frozen soil, different geomorphic units, frozen soil and the convenience of construction operation are all important factors that affect the stability of the tower.