水库护坡静冰压力及断裂韧度测试研究  

TEST AND FRACTURE TOUGHNESS ANALYSIS FOR STATIC ICE PRESSURE OF RESERVOIR SLOPE

作　　者：刘晓洲[1,2] 檀永刚[3] 李洪升[3] 白会人[1] 

机构地区：[1]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,大连116622 [2]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,兰州730000 [3]大连理工大学桥梁工程研究所,大连116023

出　　处：《工程力学》2013年第5期112-117,124,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50809007);中科院冻土工程国家重点实验室开放基金项目(SKLFSE200907);大连市科技计划项目(2009E12SF148)

摘　　要：该文结合典型水库的实际工程问题,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,针对冰体材料对应变速率反应敏感的特性,在满足R条件下,对其进行了符合脆性破坏的断裂力学试验,并分别得到相应的断裂韧度值KIC和GC。同时,将其同采用半解析有限元法计算所得到的数值解相比较,两者结果相近、规律相同,进而说明该理论模型及其研究方法是合理有效的。为季节性冻土地区水库护坡抗冰冻破坏问题的研究进行了有意义的尝试,并为其设计提供了参考和依据。Fracture mechanics has been introduced to study some practical engineering problems about Typical reservoir located in Shenyang. From the point of view of fracture mechanics, the main reasons of freezing damage to the reservoir slope are analyzed. For ice, strength is very sensitive to strain rate, fracture mechanics experiments which meet brittle failure theory have been conducted in the condition of Based on testing results, the fracture toughness Kxc and Gc are obtained. Numerical solutions obtained from semi-analytical finite element methods are close to the results mentioned above, which proves this theoretical model as well as the research method is reasonable and effective. It makes significant attempt for research on avoiding freezing damage to reservoir slope in seasonal frozen soil region. The conclusion may serve as reference to the design of reservoir slopes.

关 键 词：断裂力学 应变速率 韧脆转变 翼型裂纹 断裂韧度 

分 类 号：O346.11[理学—固体力学] TV64[理学—力学]