寒区水库护坡冰冻破坏问题中的断裂力学分析  

Application of Fracture Mechanics to Analyze Frost Breakage of Reservoir Revetments in Cold Regions

作　　者：刘晓洲[1,2] 刘鹏[2] 李洪升[2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [2]大连大学辽宁省高校复杂结构体系灾害预测与防治重点实验室,辽宁大连116622

出　　处：《冰川冻土》2010年第3期543-548,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(50809007);中国科学院冻土工程国家重点实验室开放基金项目(SKLFSE200907);辽宁省高等学校科研计划项目(2008023)资助

摘　　要：寒区水库护坡冬季常常会在低气温和低温环境的共同作用而产生冰冻破坏,进而影响其发挥正常的作用,甚至会使其完全失去作用.结合团结水库的实际工程问题,在传统分析、计算方法的基础上将断裂力学引入进来,从断裂力学的角度分析了该水库护坡产生冰冻破坏的主要原因有三大因素:冰推、冻胀和浪淘,其中冰推和冻胀起控制作用,浪淘起辅助作用.根据冰冻破坏原因分析,提出了钢筋混凝土护坡板的设计方案,并对其进行了抗冰推、抗冻胀破坏的验算校核,结果证明:该计算方法和设计方案完全能够使寒区水库护坡达到抵抗冰冻破坏的目的.为解决寒区平原水库护坡抗冰冻破坏问题提出了新的思路,进行了有意义的探索.Under the combined effect of low-tem-perature and cryogenic environment,reservoir re-vetment often suffers from frost damage in winter,and then is unable to work properly,even become invalid completely.In this paper,practical engi-neering problems in the Tuanjie Reservoir are con-sidered,and fracture mechanics are brought to cal-culate and analyze quantitatively the frost breakage on the base of traditional methods of analysis and calculation.From the viewpoint of fracture me-chanics,there are three main factors on the frost breakage of the reservoir revetment： ice thrust,frost heave and wave erosion.Among them,icethrust and frost heave play controlling roles,and the wave erosion plays an assistant role.Based on the analysis on the frost damage,a design of revetment with reinforced concrete flat slabs has been proposed,and was checked for anti-ice thrust and anti-frost heave,which indicate that the calculation methods and design are applicable and practical for the purposes of protecting the res-ervoir revetment against frost breakage in the cold regions.Consequently a new idea is provided,which is useful to protect reservoir revetment a-gainst frost breakage in the cold regions.

关 键 词：护坡 断裂力学 低温环境 冰压力 

分 类 号：P642.14[天文地球—工程地质学]