三峡船闸花岗岩亚临界裂纹扩展试验研究

TESTING STUDY OF SUBCRITICAL CRACK GROWTHOF GRANITE AT THE THREE GORGES SHIPLOCK

采用双扭试件和自行研制的加载装置，对三峡船闸花岗岩进行了亚临界裂纹扩展试验研究。采用ＵＣＡＭ５Ｂ自动巡回监测仪量测加载过程中试件的位移和应变。根据试验结果，得到了花岗岩亚临界裂纹扩展速度与应力强度因子之间的关系和花岗岩的断裂韧度。由于试验方案设计合理。

Subcritical crack growth of granite at the Three Gorges shiplock is studied by an experiment method. Double torsion specimens are applied to study subcritical crack growth. Loading apparatus is studied and made. UCAM5B is used to measure displacement and strain under loading. Based on testing results, the relationship between velocity of granite subcritical crack growth and stress intensity factor, and the fracture toughness are obtained respectively. Due to the rationality of the experiment method, the results are reliable.