Adopting the New Critical School s approach, Cleanth Brooks theory of paradox and irony in particular, this paper holds that the novella is constructed on an aesthetical principle of paradoxes and ironies.

Regarding the engineering case of deep ditch excavation operated in Zhe-Gan Railroad Hengfeng Station,the paper discussed some of the technologies and measures responsible for the engineering safety,such as the employment of millisecond delay loose blasting,the construction of two levels of steel tube shelving,the preparation of Brugg net and the adoption of the power reduction cage.