黄土地层结构性强度弱化对地下结构内力的影响研究  

Effect of weakening structural strength in loess on the internal force of underground structure

作　　者：江浩[1] 李荣建[1] 戚长军[2] 李海涛[2] 李锦[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]机械工业勘察设计研究院有限公司,陕西西安710043

出　　处：《西安科技大学学报》2015年第6期763-767,共5页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金资助项目(11072193);陕西省黄土力学与工程重点实验室项目(14JS064)

摘　　要：黄土是一种典型的结构性土,其特殊的结构性直接影响着黄土的力学性质,为了满足黄土地区地下工程的需求,黄土结构性强度的局部弱化对隧道衬砌内力的影响应给予合理的评价。文中综述了黄土结构性与黄土隧道的研究现状,通过弹塑性有限元法分析了黄土结构强度在不同局部弱化的条件下地下结构内力变化规律。数值计算研究表明:地下结构内力不仅随着黄土结构强度弱化而改变,而且结构强度的弱化区域对隧道衬砌内力的分布有着重要影响。Loess is a kind of typical structural soil, its special structure directly affects the mechanical properties of the loess. The impact of structural strength on the lining moment of tunnel engineering should be properly evaluated in order to meet the engineering requirement in loess area. This paper re- viewed the current research of structural loess and loess tunnel, and then the variation of internal force of underground structure under the condition of the local weakening of structural strength in loess is ana- lyzed by means of the internal force of un the weakening location moment of tunnel. elastic-plastic finite element method. The numerical calculation results show that derground structure changes with the weakening of structural strength of loess, and of structural strength plays an important role in regional distribution of the lining

关 键 词：结构性黄土 局部强度弱化 地下结构 隧道衬砌弯矩 有限元法 

分 类 号：TU444[建筑科学—岩土工程]