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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
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### 冰煤断裂韧度的测试研究

1. 大连理工大学, 工程力学系, 辽宁, 大连, 116023
• 收稿日期:2002-10-11 修回日期:2003-01-11 出版日期:2003-08-25 发布日期:2012-04-26
• 作者简介:张小鹏(1955- ),男,辽宁大连人,副教授,1982年毕业于大连工学院,现主要从事实验力学方向研究.E-mail:liuwb@student.dlut.edu.cn
• 基金资助:
国家自然科学基金项目(50278010)资助

### Experimental Study of the Fracture Toughness of Frozen Coal

ZHANG Xiao-peng, XING Huai-nian, HUANG Cheng, LIU Wei-bo, LI Lun

1. Department of Engineering Mechanics, Dalian University of Technology, Dalian Liaoning 116023, China
• Received:2002-10-11 Revised:2003-01-11 Online:2003-08-25 Published:2012-04-26

Abstract: Coal is always frozen into block with water in transportation for the purpose of being fixed up and not burned. As a sort of multiple components and a granule aggregation in dispersed state, frozen coal behaves similar to frozen soil. On the basis of its unique ice-cementation effect and the existent of non-frozen water that varies with dynamical balance state between the frameworks of mineral granule, the mechanical behaviour of frozen coal is more complex than usual incompact medium, dependent on load, vibration period and temperature. In order to make it easy to unpack frozen coal, people prefabricate some cracks on it before transportation. In this thesis, experimental study of fracture toughness of frozen coal at low temperature is presented. Three-point bending tests are conducted on frozen coal so as to determine its fracture toughness KIC under various crack length. Sample dimension must meet three essential conditions: plane strain condition, linear elasticity condition and ligament size condition. After the tests, KIC was calculated from the test data, which should be taken take into account with the three essential conditions to validate the validity of the test. The test results show that the value of KIC of frozen coal decreases with shortening the crack length. Thus the crack should be prefabricated deep customarily. But due to vibration action from the carriage, the crack may be getting deeper. So under vibration action, the depth of crack should be prefabricated equal to the reality. Sample preparing, test equipment construction, calculation formula of KIC, of plastic area in crack peak, phenomena of inactivation and development of crack are also discussed.

• P642.1