Abstract: With metal fatigue in material mechanics, this paper deduces the limestone fatigue curve of Longmen Grottoes by means of marble's one within the error permission. By the experiment elects the crucial factors of current vibration environment in Longmen Grottoes, the author contrasts the result of the experiment with its fatigue curve referred above and analyses the fatigue effect of Longmen Grottoes. Finally, it is pointed out that after Longmen Grottoes have being suffered weathering and water-erosion more than 1500 years, the vibration environment is becoming an crucial factor leads to fatigue effect, especially in those weak surface carvings just like the crossings of several rifts, serious weathering places, etc.

Key words: Longmen Grottoes, vibration environment, fatigue effect

摘要： 借鉴材料力学中金属疲劳破坏的研究手段，在误差允许范围内用大理岩疲劳曲线推导出龙门石窟石灰岩疲劳曲线。通过对石窟实际振动环境中典型要素的抽取和振动试验，将试验结果与疲劳曲线进行对比，分析了龙门石窟的疲劳破坏效应。文章指出，在经历了1500多年的风化和流水溶蚀后，振动环境已成为导致龙门石窟某些薄弱点(如多条裂隙交叉点、严重风化、酥解的壁面雕刻品等)产生疲劳破坏的重要诱发因素。

关键词: 龙门石窟, 振动环境, 疲劳效应