| 摘要: |
| Ⅱ型断裂破坏是土体断裂破坏的基本类型之一,Ⅱ型断裂韧度的测试方法是目前研究土体Ⅱ型断裂破坏性状的难点.首先介绍了各种Ⅱ型断裂韧度测试方法的基本原理和方法,然后针对土体的特点,分析了各种方法用于测试土体断裂韧度的可行性和可靠性.重点分析了前人用于测试土体Ⅱ型断裂韧度的非对称四点弯曲试验方法,在此基础上,提出了一种新的土体Ⅱ型断裂韧度测试方法.新方法采用结构简单、易于制样的单侧开缝方形土饼试样,直接施加剪切荷载,使得试样在纯Ⅱ型加载条件下发生断裂破坏,从而确保了试验结果的可靠性. |
| 关键词: 土体 断裂破坏 Ⅱ型断裂韧度 试验方法 |
| DOI： |
| 分类号:TU411.3 |
| 基金项目:重庆交通大学研究生教育创新基金资助项目 |
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| A study of a test method for mode Ⅱ fracture toughness of soil mass |
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DENG Wen-jie,WANG Jun-jie,ZHANG Hui-ping
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1,2(1.National Inland Waterway Regulation Engineering Research Center,Chongqing Jiaotong University,Chongqing 400074,China;2.Key Laboratory of Hydraulic & Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China)
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| Abstract: |
| The mode Ⅱ fracture failure is one of the basic modes in the soil mass,and the test method of mode Ⅱ fracture toughness is the weak point for study of the fracture characters of soil mass at present.In this paper,the basic theory and methods of each test are introduced at first,and then based on the characteristics of the soil mass,the feasibility and reliability of each method for testing the mode Ⅱ fracture toughness are analyzed.We focus especially on the anti-symmetric four-point bend(ASFPB) test method which has been often used for testing the mode Ⅱ fracture toughness of the soil mass,and based on it we propose a new method.In the new method,the specimen is a single-edge cracked one and its structure is simple;in order to make sure the reliability of the test results,the shear load is directly applied to the soil specimen and the specimen turns fractured in a pure mode Ⅱ condition. |
| Key words: soil fracture failure mode Ⅱ fracture toughness test method |
