严寒地区冻土地质条件下阶型直柱基础的分析与研究
|
摘要
为了深入研究严寒地区冻土地质条件下直柱基础的应力应变特性,构建了阶型直柱基础模型,利用数值模拟方法分析基础在不同冻胀工况下的结构响应,并与未冻胀情况进行对比。分析结果表明切向冻胀力对于基础有明显的上拔作用,在强冻胀等级下基础发生上拔破坏。当冻土处于强冻胀等级及以上时,设计严寒地区输电线路基础需要考虑降低冻胀力的措施。
In order to further study the stress-strain characteristics of straight column foundation in severe frozen area, a straight column foundation model with two stages is constructed. The structural response of foundation under different frost heaving conditions is analyzed by numerical simulation method, and compared with that of normal condition. The results show that the tangential frost heaving force has a significant uplift effect on the foundation, Under the strong frost heaving grade, the foundation occurred uplift failure. When the permafrost is in the strong frost heaving level and above, the measures to reduce the frost heaving force should be considered in the design of the transmission line foundation in the cold area.
In order to further study the stress-strain characteristics of straight column foundation in severe frozen area, a straight column foundation model with two stages is constructed. The structural response of foundation under different frost heaving conditions is analyzed by numerical simulation method, and compared with that of normal condition. The results show that the tangential frost heaving force has a significant uplift effect on the foundation, Under the strong frost heaving grade, the foundation occurred uplift failure. When the permafrost is in the strong frost heaving level and above, the measures to reduce the frost heaving force should be considered in the design of the transmission line foundation in the cold area.
引文
[1]边疆,寇丽娜,等.青藏高原多年冻土区冻害类型及防治[J].中国地质灾害与防治学报,2011(3):129-133.
[2]程爱君,叶阳升.多年冻土地区路基冻害分析及防治措施[J].铁道建筑,2006(7):60-61.
[3]帅军.冻土与桩基础相互作用研究[D].江苏大学,2017:96.
[4]刘雨.多年冻土地区单桩承载特性研究[D].东南大学,2006:66.
[5]陈学敏,等.多年冻土桩基础土体温度场数值分析[J].黑龙江电力,2013(2):127-129.
[6]姜和平,刘兆瑞.冻土地区±500 k V直流输电线路地基与基础设计[J].内蒙古电力技术,2006(4):1-4.
[7]冷毅飞,张喜发,张冬青.季节冻土区公路路基细粒土冻胀敏感性研究[J].冰川冻土,2006(2):211-216.
[8]国家能源局.冻土地区架空输电线路基础设计技术规程:DLT 5501-2015[S].中国电力出版社,2015.
[2]程爱君,叶阳升.多年冻土地区路基冻害分析及防治措施[J].铁道建筑,2006(7):60-61.
[3]帅军.冻土与桩基础相互作用研究[D].江苏大学,2017:96.
[4]刘雨.多年冻土地区单桩承载特性研究[D].东南大学,2006:66.
[5]陈学敏,等.多年冻土桩基础土体温度场数值分析[J].黑龙江电力,2013(2):127-129.
[6]姜和平,刘兆瑞.冻土地区±500 k V直流输电线路地基与基础设计[J].内蒙古电力技术,2006(4):1-4.
[7]冷毅飞,张喜发,张冬青.季节冻土区公路路基细粒土冻胀敏感性研究[J].冰川冻土,2006(2):211-216.
[8]国家能源局.冻土地区架空输电线路基础设计技术规程:DLT 5501-2015[S].中国电力出版社,2015.