基于能量平衡法的原状冻土Ⅰ型非线性断裂韧度测试研究  

Research on test of model Ⅰ nonlinear fracture toughness of undisturbed frozen soils based on energy balance method

作　　者：刘晓洲[1,2] 吴寅[1] 王忠昶[1] 李洪升[1] 武俊杰[2] 

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

出　　处：《岩土力学》2009年第S2期83-87,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.50809007);辽宁省高等学校科研项目资助(No.2008023)

摘　　要：基于能量平衡的原理,采用冻土弯曲断裂试验模型,根据不同深度的冻胀量、冻深与时间变化规律,严格控制试样制作及试验时的温度,对原状冻土进行了断裂韧度测试试验。得出Ⅰ型直裂纹试样的GC和GC*值,从而为原状冻土的非线性断裂破坏问题的研究进行了有意义的尝试,拓宽了思路。By using the fracture model based on the principle of energy balance,nonlinear fracture toughness tests on undisturbed frozen soils were conducted.According to the variational rules of heave quantities,the frozen depths and time at different depths,the temperatures were controlled strictly when the specimens were being made and tested.The nonlinear fracture toughness GC and GC of model Ⅰ straight crack specimens are obtained,which make a meaningful attempt and spread the thoughts for the research of nonlinear fracture toughness of undisturbed frozen soils.

关 键 词：原状冻土 现场试验 能量平衡法 非线性断裂韧度 

分 类 号：O346.1[理学—固体力学]