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，试验结果可靠 Double-torsional test pieces and self-developed loading devices were used to study the subcritical crack propagation of the Three Gorges shiplock granite. Uses the UCAM 5B automatic tour monitor to measure the displacement and the strain during the loading process. According to the experimental results, the relationship between the granite subcritical crack propagation rate and the stress intensity factor and the fracture toughness of the granite are obtained. Due to the reasonable design of the test plan, the test result is reliable