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以西南地区代表性碎石土地基为研究对象,采用时程分析法,研究Ⅶ、Ⅷ、Ⅸ度地震作用下,桩基础在桩周土体不同加固范围时的动力响应变化.采用全寿命周期成本理念,分析常规设计与考虑抗震设计(土体加固)时输电线塔基的建设成本与地震损失,探讨地基土体加固后的桩基础在全寿命周期下的成本节约率,以此提出不同地震烈度下桩周土体的最优加固范围.结果表明:随着桩周碎石土加固范围的扩大,塔基的动力响应不断减小.Ⅶ、Ⅷ、Ⅸ度地震时的土体最优加固范围分别是2d、3d、5d,在最优加固范围下,输电线塔基在全寿命周期内的成本节约率分别为31.1%、30.0%、27.0%.
Taking the representative gravelly soil foundation in the southwest as the research object and the time history analysis method, the dynamic response of the pile foundation under the different consolidation range of the soil around the pile foundation under the action of Ⅶ, Ⅷ and Ⅸ degree earthquakes is studied. Cost concept, analysis of conventional design and considering the earthquake resistance design (soil reinforcement), the construction cost of transmission line base and earthquake loss, to explore the cost-saving rate of pile foundation reinforced by foundation soil in the whole life cycle, The results show that the dynamic response of the foundation decreases with the enlargement of the reinforcement area of the pile-surrounding gravel soil. The optimal soil mass for the Ⅶ, Ⅷ and Ⅸ earthquakes The reinforcement range is 2d, 3d and 5d, respectively. Under the optimal reinforcement range, the cost savings of transmission tower in the whole life cycle are respectively 31.1%, 30.0% and 27.0%.