基于全寿命周期的斜坡桩周土体最优加固范围  

Optimal reinforcement scope of soil around piles on a slope by life cycle cost

作　　者：喻豪俊 彭社琴[1] 赵其华[1] 陈继彬[1] 丁梓涵 

机构地区：[1]成都理工大学环境与土木工程学院,地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]四川大学水利水电学院,水力学与山区河流开发保护国家重点实验室,成都610065 [3]四川省蜀通岩土工程公司,成都610000

出　　处：《兰州大学学报（自然科学版）》2017年第1期28-34,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划项目(2011CB013501);长江学者和创新团队发展计划项目(IRT0812)

摘　　要：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%.By choosing a representative gravel soil foundation in the Southwest China as the object of study and adopting the time history analysis method,study was made of the dynamic response of the pile foundation under the effect of Ⅵ,Ⅷ,Ⅸ degree earthquakes when the reinforcement range around the pile was variable.And using the life-cycle cost concept,the construction cost and the earthquake loss of pile foundation of transmissionline between the conventional design were analyzed and the seismic design（soil reinforcement） was considered.The cost savings rate of pile foundation after a consideration of soil reinforcement was discussed,and the optimal reinforcement scope of gravel soils under the different earthquake intensity was put forward.The results showed that the dynamic response of the tower foundation decreased constantly with the expansion of reinforcement scope of gravel soil around the pile.The optimal soil reinforcement range was 2d,3d and 5d when the earthquake intensity was Ⅶ,Ⅷ,Ⅸ degree respectively,and under the optimal reinforcement scope,the cost savings rate of the pile foundation of the transmission line was 31.1%,30.0%and 27.0%respectively.

关 键 词：桩基础 输电线路 地震 土体加固 全寿命周期 

分 类 号：TU4[建筑科学—土工工程]