摘要
开展含缺陷空间(孔隙、裂隙)岩体内部冻胀力发生机制及演化规律分析,是岩体冻胀损伤、断裂评价研究的基础。孔隙、裂隙冻胀损伤发生空间尺度存在显著差异,其冻胀损伤机制及冻胀力演化分析也不尽相同,可将孔隙介质冻胀损伤理论归纳为四类:①基于水冰相变体胀的冻胀损伤模型,包括体积膨胀理论、静水压理论等;②基于水热迁移的冻胀损伤理论,包括分凝冰理论、全过程冻胀理论等;③基于孔隙水相变热力学平衡分析的损伤理论,包括毛细管理论、结晶压理论等;④孔隙介质力学理论。裂隙介质冻胀损伤一般认为发生在宏观空间尺度上,着重关注裂隙的冻胀扩展过程。其损伤理论可分为体积膨胀理论(包括水压致裂理论)和分凝冰理论,而裂隙介质冻胀损伤对微观过程(如未冻水迁移、岩/冰界面受力特性等)关注度有待深入。藉此分别讨论上述冻胀损伤理论原理、适用条件及局限性,并对不同缺陷形态(孔隙、裂隙)引起的冻胀力演化机制差异性进行简要分析。
Frost damage of porous and fissured rocks occur with various spatial scales, and the underlying frost damage mechanisms are discrepant. The existing frost damage theories of porous medium can be classified into four categories: ①these theories are regarded as the 9% volumetric expansion of water over freezing;②these theories are built on the basis of unfrozen water migration towards the freezing front;③these theories are assumed the freezing of pore water being at the thermodynamics equilibrium state, including the capillary theory and the crystallization pressure theory;④these theories are adopted the pore-mechanics method to elucidate frost damage mechanisms. The frost damage of fissured rocks arises mainly at macro-scale, the current theories mainly include the volumetric expansion theory and the ice segregation theory, which are paying more attentions on the fissure propagation rather than some key processes at micro-scale such as unfrozen water migration and stress state on ice/rock interfaces. Then, the underlying mechanisms, the application conditions and the disadvantages of these frost damage theories are discussed. The differences between the frost damage evolution patterns of the two defect morphologies(pore and fissure) are also investigated.
作者
申艳军
杨更社
王婷
贾海梁
奚家米
罗滔
王永志
SHEN Yanjun;YANG Gengshe;WANG Ting;JIA Hailiang;XI Jiami;LUO Tao;WANG Yongzhi(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;School of Highway,Chang'an University,Xi'an 710064,China;Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xi'an 710123,China)
出处
《冰川冻土》
CSCD
北大核心
2019年第1期117-128,共12页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(41772333
51774231
41702334)
陕西省混凝土结构安全与耐久性重点实验室开放基金项目(XJKFJJ201802)
高寒高海拔地区道路工程安全与健康国家重点实验室开放基金(YGY2017KYPT-07)资助
关键词
孔隙
裂隙
冻胀力模型
冻胀损伤
适用性
pore
fissure
frost heave force model
frost damage
applicability
作者简介
申艳军(1984-),男,河南安阳人,副教授,2012年中国地质大学(武汉)获博士学位,从事寒区岩石冻融损伤断裂及工程应用方面教学与研究工作.E-mail:shenyanjun993@126.com.
