上井地区是一个中生代早白垩世火山穹隆。火山岩岩层围斜外倾，环状断裂发育，晚期有潜火山岩侵位。
Shangjing area is a volcanic dome formed by volcanic in active Early Cretaceous, in which the volcanic beds are dipping out with ring fracture and subvolcanic bodies intrusion in late stage.
采用AN - SYS有限元软件对环状V型缺口悬臂件进行了有限元分析，对不同的加载方式影响断裂的扩展进行了初步探讨。
The paper analyzes cantilever with 'v' shaping groove in FEM methods of ANSYS, then discusses the effect of crack growth in different loading ways.
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